II B.Tech I Semester Regular Examinations, November 2009 STRENGTH OF MATERIALS-I

Code No: W0121/R07 Set No. 1
II B.Tech I Semester Regular Examinations, November 2009
STRENGTH OF MATERIALS-I
(Civil Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Derive the relation between
(a) Modulus of elasticity (E) and modulus of rigidity (N)
(b) Modulus of elasticity (E) and bulk modulus (K)
(c) Hence show that E = 9KN/(3K+N). [6+6+4]
2. A weight of 210 kN is supported by three short pillars each of sectional area 500
mm2. The central pillar is of steel and the outer ones are of copper. The pillars are
so adjusted that at a temperature of 150 C each carries equal load. The temperature
is then raised to 950C. Find the stress in each pillar at 150C and 950 C. Take Es =
200 GPa and EC = 80 GPa s = 12 × 10−6 / 0C and c = 18 × 10−6/ 0C. [16]
3. Define shear force. Write down the equation for S. F & B. M at any section and
hence, prove the relation between S. F & B. M. Calculate the shear force and B.M
at the section shown in Figure 3. [16]
Figure 3
4. Define Neutral axis. Sketch the bending stress distribution across the cross section
of a rectangular beam section 230 × 400 m subjected to 60 KNm moment. [16]
5. Design the cross section for a beam acted upon by a bending moment = 50 KNm.
If width of beam is 200 mm calculate, depth. f = 9 N/mm2. [16]
6. (a) Explain the Mohr’s theorems, for finding the slope and deflection of a beam.
(b) A simply supported 6m rolled steel joist carries a U.D.L of 10 KN//m length.
Determine slope and deflection at a distance of 3m from one end of the beam.
[6+10]
7. (a) Derive the expressions for change in diameter and volume of a thin spherical
shell due to an internal pressure.
(b) A spherical vessel 3m diameter is subjected to an internal pressure of 2N/mm2.
Find the thickness of the plate required if maximum stress is not to exceed 80
N/mm2. Take efficiency of Joint as 75%. [12+4]
1 of 2
Code No: W0121/R07 Set No. 1
8. Compare the values of max. and minimum hoop stresses for a cast steel cylindrical
shell of 600 mm external dia. And 400 mm internal dia. Subjected to a pressure
of 30N/mm2 applied
(a) Internally and
(b) Externally. [8+8]
? ? ? ? ?
2 of 2
Code No: W0121/R07 Set No. 2
II B.Tech I Semester Regular Examinations, November 2009
STRENGTH OF MATERIALS-I
(Civil Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. A straight bar 60 cm long consists of three portions : the first 18 cm length is
of 30 mm dia, the middle 26 cm length is of 20 mm dia. and the remaining 16
cm length is of 25 cm dia. if it is subjected to an axial pull of 100 kN find the
total extension of the bar. Find also the stresses, strains and changes in length of
different portions. Take E = 200 GPa. [16]
2. A steel rail 10 m long is in the unstressed condition at 100 C. If the temperature of
the rail is increased to 60 0 C, find the stress induced if there is no provision for the
expansion of the rail. If there is a gap of 5 mm what will be the change in stress,
given E = 200 GN/ m2 & = 12 × 10 −6/ 0C. [16]
3. A simply supported beam with overhanging ends carries transverse loads as shown
in Figure 3. If wL=P, what is the ratio of a/L for which the B. M . at the middle
of the beam will be zero. [16]
Figure 3
4. For a channel section shown in Figure 4 determine the section modulus. Hence
calculate the maximum bending stresses. Sketch the distribution of bending stress
if the section is subjected to a B. M = 40 KNm. [16]
Figure 4
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Code No: W0121/R07 Set No. 2
5. Design the cross section for a beam acted upon by a bending moment = 50 KNm.
If width of beam is 200 mm calculate, depth. f = 9 N/mm2. [16]
6. A 6.5 m long Cantilever carries a uniformly distributed load over the entire length.
If the slope at the free end is 10 (one degree) what is the deflection at the free end.
[16]
7. Define the terms
(a) Circumferential stress
(b) Longitudinal stress and derive the expressions for the same in thin cylinders.
[16]
8. Compare the values of max. and minimum hoop stresses for a cast steel cylindrical
shell of 600 mm external dia. And 400 mm internal dia. Subjected to a pressure
of 30N/mm2 applied
(a) Internally and
(b) Externally. [8+8]
? ? ? ? ?
2 of 2
Code No: W0121/R07 Set No. 3
II B.Tech I Semester Regular Examinations, November 2009
STRENGTH OF MATERIALS-I
(Civil Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. A rectangular block of size 50 mm × 100 mm × 80 mm is subjected to the following
axial loads.
500 kN (tensile) on 100 mm × 80 mm faces
900 kN (tensile) on 500 mm × 80 mm faces
1000kN (Compressive) on 500 mm × 100 mm faces.
Taking the poisson’s ratio as 0.3, find the change in volume of the block. If
E = 200GPa, find the modulus of rigidity and the bulk modulus. [16]
2. A crane chain having sectional area 650 mm2 carries a load of 12 kN. As it is being
lowered at a uniform rate of 40 m per minute, the chain got jammed suddenly, at
which time the length of the chain unwound was 10 m. Calculate the stress induced
in the chain due to sudden stoppage. Neglect the weight of the chain. Take E =
200 Gpa. [16]
3. (a) Define the “Beam” and the type of action and deformation it undergoes.
(b) Draw the S.F. and B.M. diagram for a simply supported beam of span L m
loaded with UDL of w KN/m. [6+10]
4. Define section modulus. Obtain section modulus for rectangular and circular sec-
tions. Write the expression for stresses in terms of section modulus and B.M. [16]
5. Obtain the shear stress distribution for a rectangular cross section 230 × 400 mm
subjected to a shear force of 40 KN. Calculate maximum and average shear stress.
[16]
6. Write short notes on
(a) Moment area method
(b) Macaulay’s method
(c) Deflections of propped beams. [16]
7. (a) A steel cylinder 240mm internal diameter is to withstand an internal pressure
of 5N/mm2. The increase in area of the bore due to the resulting radial
expansion is limited to 0.1% of the nominal area. Calculate the necessary
thickness of the cylinder and the circumferential stress induced in the section.
Take E = 2 X 105 N/mm2, μ = 0.3
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Code No: W0121/R07 Set No. 3
(b) A long boiler tube has to withstand an internal pressure of 6N/mm2. The
internal diameter of the tube is 60 mm. Determine the thickness and mass/m
of the tube if the circumferential stress is not to exceed 130 N/mm2. Mass
density of steel is 7850 kg/m3. [10+8]
8. Compare the values of max. and minimum hoop stresses for a cast steel cylindrical
shell of 600 mm external dia. And 400 mm internal dia. Subjected to a pressure
of 30N/mm2 applied
(a) Internally and
(b) Externally. [8+8]
? ? ? ? ?
2 of 2
Code No: W0121/R07 Set No. 4
II B.Tech I Semester Regular Examinations, November 2009
STRENGTH OF MATERIALS-I
(Civil Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Explain the following : -
(a) Working stress
(b) Factor of safety
(c) Volumetric strain
(d) Poisson’s ratio. [4+4+4+4]
2. Rails of 15 m length were laid on the track when the temperature was 200C. A gap
of 1.8 mm was kept between two consecutive rails. At what max temperature the
rails will remain stress free ? If the temperature is raised further by 150C, what
will be the magnitude and nature of stresses induced in the rails? [16]
3. Define Bending moment and state of pure bending. Draw the B. M. D and S. F.
D and identify the region of zero S.F.(Figure3) [16]
Figure 3
4. Define Neutral axis. Sketch the bending stress distribution across the cross section
of a rectangular beam section 230 × 400 m subjected to 60 KNm moment. [16]
5. Derive an expression for the distribution of shear stress across the cross section.
How is average shear stress defined. Relate maximum shear stress to the average
shear stress in a rectangular section. [16]
6. A beam ABCD, 10 m long carries loads as shown in (figure6). below If E=200 x
106 KN/m2 and I=80 x 10−6 m4 determine the central deflection. [16]
Figure 6
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Code No: W0121/R07 Set No. 4
7. Define the terms
(a) Circumferential stress
(b) Longitudinal stress and derive the expressions for the same in thin cylinders.
[16]
8. A compound cylinder is formed by shrinking one tube on to another, the final
dimensions being, internal diameter 120 mm, external diameter 240 mm, diameter
at junction 180 mm. if after shrinking on, the radial pressure at the common
surface is 8N/mm2, calculate the initial hoop stresses across the sections of the
inner and outer tubes. If a fluid under a pressure of 60N/mm2, is admitted inside
the compound cylinder, calculate the final stresses set up in the sections of the
pipes. [16]
? ? ? ? ?
2 of 2
Code No: X0224
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
SWITCHING THEORY AND LOGIC DESIGN
(Com to EEE, EIE, BME, E.CON.E, ECC, ICE)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. a)Convert the following numbers ( 4 + 4 )
i) to base 6 ii)
to base 10
b) Explain error correction and error detection codes with examples. (8)
2. a) Reduce the following Boolean expression to the minimum number of literals(2+3+ 3)
i) x(x’+Y)
ii) xy+x’z+yz
iii) (x+y)(x+y’)
b) Draw the logic diagrams to implement the following Boolean expressions: (8)
i) Y= A + B + B’ (A + C’)
ii) Y=

iii) Y= A + CD + ABC
iv) Y= (A ’ + B
3. Simplify the following functions using three variables map? (16)
a) F(x, y, z) = (0,1,5,7)
b) A¢B + BC¢ + B¢C¢
4. Write short notes on 3 to 8 line decoder? (16)
5. a) Tabulate the PLA programming table for the four boolean functions listed below:
[8]
A(x,y,z) = m(1,2,4,6)
B(x,y,z) = m(0,1,6,7)
C(x,y,z) = m(2,6)
D(x,y,z) = m(1,2,3,5,7)
b) Realize XOR gate using three threshold gates. [8]
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Code No: X0224
6. a) Define the following terms in connection with a flip-flop: [2+2+4+2]
i) Setup time
(ii) Hold time
(iii) Propagation Delay
(iv) Preset [
b) Compare merits and demerits of ripple and synchronous counters. [6]
7. Find the equivalence partition and a corresponding reduced machine in standard form
(16)
PS NS,Z
X=0 X=1
A B,0 E,0
B E,0 D,0
C D,1 A,0
D C,1 E,0
E B,0 D,0
F C,1 C,1
G C,1 D,1
H C,1 A,1
8. Construct an ASM block that has 3 input variables (A,B,C), 4 output variables
(W,X,Y,Z) and 2 exit paths. For this block, output Z is always 1 and W is 1 if A & B are
both 1. If C=1 & A=0,Y=1 and exit path 1 is taken. If C=0 or A=1, X=1 and exit path 2 is
taken. (16)








Code No: X0224
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
SWITCHING THEORY AND LOGIC DESIGN
(Com to EEE, EIE, BME, E.CON.E, ECC, ICE)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. a) What is self complementary code? Explain with two examples. ( 8 )
b) Given that ( 4 + 4 )
i) ii) determine the value of the b
2. a) List the truth table of the function ( 9)
i)F= xy + xy’+ y’z
ii) F= x’z + yz
iii) F= x’z+xy
b) given AB’+A’B=C show that AC’+A’C=B. (7)
3. Simplify the following Boolean expression using three- variable map.(8+8)
a) F(A, B,C) = (0,2,3,4,6)
b) xy + x¢y¢z¢ + x¢yz¢
4. Explain the operation of priority Encoder?
5. a) Realize the following Boolean function using Threshold gate.
F(x1,x2,x3,x4) = m(0,1,3,4,5,6,7,12,13) [12]
b) What is a Programmable logic array? [4]
6. a) Design a modulo-12 up synchronous counter using T-flip flops and draw
the circuit diagram. [10]
b) Compare synchronous and asynchronous sequential circuits. [6]
7. Obtain the equivalent classes using partition method and give proper (16)
assignment
PS NS,Z
X=0 X=1
A F,0 B,0
B D,0 C,0
C F,0 E,0
D G,1 A,0
E D,0 C,0
F F,1 B,1
G G,0 H,1
H G,1 A,0
1 of 2

Code No: X0224
8. Construct an ASM block that has 3 input variables (D,E,F) and 4 output variables
(P,Q,R,S) and 2 exit paths. For this block, output P is always 1 and Q is 1 if D=1.
If D and F are 1 or if D and E are 0, R=1 and exit path 2 is taken. If (D=0 and
E=1) or (D=1 and F=0), S=1 and exit path 1 is taken. Realize it with PLA
and 2 D flip flops. Draw the block diagram and give the PLA table. (16)






















Code No: X0224
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
SWITCHING THEORY AND LOGIC DESIGN
(Com to EEE, EIE, BME, E.CON.E, ECC, ICE)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. a) What is Hamming code? Explain with an example. ( 8 )
b) Find the 9’s and 10’s complement of the following decimal numbers
i) 52,784,630 ii) 63,325,600 iii) 00,000,000 ( 8 )
2. a) Express the Boolean function F = A + B’C as a sum of minterms. (8)
b) Show that a positive logic NAND gate is a negative logic NOR gate and vice versa
(8)
3. Simplify the following Boolean function by first finding the essential prime implicants
4. Write a short notes on 4-to-1-multiplexer?
5. a) Implement the following Boolean functions using PROM. [10]
W (A,B,C,D) = m(0,2,6,7,8,9,12,13)
X (A,B,C,D) = m(0,2,6,7,8,9,12,13,14)
Y (A,B,C,D) = m(2,3,8,9,10,12,13)
Z (A,B,C,D) = m(1,3,4,6,9,12,14)
b)Write short notes on Multigate synthesis. [6]
6. a) Draw and explain the working of Master-Slave JK Flip-Flop. [8]
b) Design a sequence detector that detects 110010. Implement the Sequence detector by
using D-type flip-flops. [8]
7. Find the equivalence partition and a corresponding reduced machine in standard form
for the machine given below. (16)
1 of 2
PS NS,Z
X=0 X=1
A E,0 C,0
B C,0 A,0
C B,0 G,0
D G,0 A,0
E F,1 B,0
F E,0 D,0
G D,0 G,0


Code No: X0224
8. Construct an ASM block that has 3 input variables (A,B,C), 4 output variables
(W,X,Y,Z) and 2 exit paths. For this block, output Z is always 1, and W is 1 if A and B
both are 1. If C=1 and A=0,Y=1 and exit path 1 is taken. If C=0 or A=1, X=1 and exit
path 2 is taken. Realize the above using multiplexer and register. (16)
2 of 2


Code No: X0224
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
SWITCHING THEORY AND LOGIC DESIGN
(Com to EEE, EIE, BME, E.CON.E, ECC, ICE)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. a) Represent the unsigned decimal numbers 842 and 537 in BCD, and then show the
steps necessary to form their sum. ( 8 )
b)Represent the decimal number 5,137 in i)BCD ii) excess-3 code, iii) 2421 code ,and
vi) a 6311 code. ( 8 )
2. a) Show that the dual of the exclusive-or is equal to its complement ( 8 )
b) Express the complement of the following function in sum of minterms forms (8)
i) F(x,y,z)= xy+xz
ii) F(A,B,C) = (2, 4, 5, 7)
3. Simplify the following Boolean function F together with the don’t care condition d; then
expressed the simplified Boolean function in sum of minterms. (8+8)
a) F(x, y, z) = (0,1,2,4,5)
b) d(x, y, z) = (3,6,7)
5.Implement the following function with a multiplexer, with an 8×1 multiplexer?(16)
F(A, B,C,D) = (0,3,5,6,8,9,14,15,)
6. Realize the given functions using a PLA with 6 inputs, 4 outputs and 10 AND gates:
[16]
f1 (A,B,C,D,E,F) = m(0,1,2,3,7,8,9,10,11,15,32,33,34,35,39,40,41,42,43,45,47)
f2 (A,B,C,D,E,F) = m(8,9,10,11,12,14,21,25,27,40,41,42,43,44,46,57,59)
6. a) Design a Mod-6 synchronous counter using JK flip-flops. [10]
b) Compare combinational and sequential circuits. [6]
7. a)Find the equivalence partition for the given machine and a standard form of the
corresponding reduced machine. (8+8)
1 of 2

Code No: X0224
PS NS,Z
X=0 X=1
A B,0 E,0
B E,0 D,0
C D,1 A,0
D C,1 E,0
E B,0 D,0
b) Convert the following Mealy machine into a corresponding Moore machine.
PS NS,Z
X=0 X=1
A B,0 E,0
B E,0 D,0
C D,1 A,0
D C,1 E,0
E B,0 D,0
8. a) Explain in detail the Mealy state diagram and ASM chart for it with an example. (8)
b) Show that 8 exit paths in an ASM block emanating from the decision boxes that check
the eight possible binary values of three control variables X,Y,Z. (8)









Code No: X0322
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
OBJECT ORIENTED PROGRAMMING
(Mechanical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. a)“Members of a community interact with one another by making requests”. Explain how.
(8+8m)
b) What does it mean for one method to override another method from a parent class?
2. a) What is byte code? What are the advantages of translating a Java program into (8m)
byte code?
b) Explain various Arithmetic and Bitwise operators supported by Java and explain each
with examples. (8m)
3. a) Explain the difference between the method overloading and method overriding
with an example for each. (8m)
b) Distinguish between abstract methods and non-abstract methods with an example.
(8m)
4. a) Explain the difference between an interface and a class with an example each.
(8m)
b) Explain in detail various forms of interface implementations. (8m)
5. a) Briefly discuss the life cycle diagram of the thread and explain its stages. (8m)
b) What are built in exceptions? With an example, describe checked and unchecked
exceptions. (8m)
6. a) What is delegation event model? Briefly describe the roles of sources and listeners.
( 8m)
b) What are Event classes? When the ActionEvent is generated? Describe the integer
constants of ActionEvent class. (8m)
7. a)What is an applet? What packages are to be imported while writing an applet program?
Explain why those packages are needed? (8m)
b)Explain with an illustration the steps to follow to use a scroll pane. (8m)
8. a)What is a socket? Why are they important in modern communications? (4m)
b)Give the syntax of the following methods of DatagramPacket class and explain:
getAddress( ), getData( ), getLength( ), setAddress( ), setData( ) (12m)
1 of 1

Code No: X0322
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
OBJECT ORIENTED PROGRAMMING
(Mechanical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. a) Explain the fundamental characteristics of Object Oriented Programming. (8+8m)
b) Explain how the members of a community interact with one another.
2. a) What is a variable? Explain the scope and lifetime of variable with appropriate (8m)
examples?
b)Write a Java program to print the following : (8m)
* * * * *
* * * *
* * *
* *
*
3. a) What is an Object class? Explain the object hierarchy. (8m)
b) Explain the usage of super keyword with an example. (8m)
4. Explain the process of creating, defining, importing and accessing a package with suitable
examples. (16m)
5. a) Briefly discuss the thread priorities. (6m)
b) What is an Exception? Briefly discuss Termination and Resumption models of (10m)
exception handling. Is java uses termination or resumption model of exception handling?
6. a) Describe Event, Event Sources and Event Listeners? (8m)
b) Describe in detail about the AWT class hierarchy. (8m)
7. a)What is an applet? What are the two types of applets? Explain briefly. (8m)
b)Explain with an example the steps to follow to use a tree. (8m)
8. a)What is a port? List any four well-known ports. (6m)
b)Explain how multiple clients can be serviced by a server? (10m)
1 of 1

Code No: X0322
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
OBJECT ORIENTED PROGRAMMING
(Mechanical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. a) What is the need for Object Oriented paradigm? (8+8m)
b) What is a class inheritance hierarchy? How is it linked to classes and behavior?
2. a) What is Java Applet? How its creation does change internet programming? (8+8m)
b) Write a Java class Stack that implements a stack of integers. Write a tester program to
demonstrate Stack class.
3. a) What is dynamic method dispatch? Write a Java program to demonstrate dynamic
method dispatch. (8m)
b) Consider the following Java program:
public class MainTest
{
public static void main(String[] args)
{
C obj = new C( );
System.out.println(obj.max(13,29));
}
}
class A
{
int max( int x, int y)
{
if(x > y)
return x;
else
return y;
}
}
class B extends A
{
int max(int x, int y)
{
return super.max(y,x)-10;
}
}
class C extends B
1 of 2

Code No: X0322
{
int max(int x, int y)
{
return super.max(x+10,y+10);
}
}
Find the output of the above program by stating the necessary reasons. (8m)

a) Explain the difference between an interface and an abstract class with an example.
(8m)
b) List and explain any four classes available in java.io package (8m)
5. a) What is an Exception? Explain the hierarchy of Exception types. (6m)
b) What is default exception handler? With an example java program, explain the same.
Is it essential to catch all types of exceptions? (10m)
6. a) What is an EventObject? What are the two methods of EventObject? Describe
AdjustmentEvent class. (8m)
b) What is Component class? In what way it is related to Container class? When the
ComponentEvent is generated and describe the component event types. (8m)
7. a) Why Swing applets are more popular than AWT based applets? (2m)
b) What are the three models JTable relies on? What are the steps required to set up a
simple JTable that can be used to display data? Explain with an example. (14m)
8. a) Explain client/server communication? (8m)
b) What is HTTP? How does it work? (8m)
2 of 2

Code No: X0322
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
OBJECT ORIENTED PROGRAMMING
(Mechanical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. a) “One principal of object-oriented problem solving is the vehicle by which activities are
initiated”. Explain.
b) What is a class? How are classes linked to the behavior?
2. a) Explain how JAVA changed the Internet.
b) What is method overloading? Explain with an example.
3. a) Explain an abstract class with an example. (8m)
b) Explain the usage of final keyword. (6m)
c) What is the difference between print( ) and println( ) methods. (2m)
4. a) Explain the various forms of access protection in Java. (8m)
b) Explain the usage of StringTokenizer class with an example (8m)
5. a) Describe throw, throws and finally clauses. (9m)
b) What is Daemon thread? Differentiate between process and thread. (7m)
6. a) What are the Adapter classes? Briefly describe the MouseMotionAdapter class ( 8m)
b) What is a FocusEvent? In what way it is related to ComponentEvent ? Briefly describe
the FocusEvent Class. (8m)
7. a)How applet differs from an application? (8m)
b)Mention the two models on which JTree relies on. What are the various events
generated by JTree and what are the corresponding event listeners? Mention the
corresponding package for these classes and interfaces. (8m)
8. a)Explain how socket communication takes place. (8m)
b)What are factory methods? Explain the three commonly used InetAddress factory
methods. (8m)
1 of 1

Code No: X0425
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
ELECTRONIC CIRCUIT ANALYSIS
(Com.to ECE,ETM)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. a) Derive the expressions for (i) voltage gain, AV , (ii) current gain, Ai, (iii) input
impedance Ri and (iv) output resistance Ro of a CE amplifier using h-parameter
model. (8)
b) The h parameters of a transistor used in CE amplifier are given as : hie=1k ;
hfe=100, hre=2*10-4 and hoe=20 A/V. If Rc=5 k and Rs = 1k , determine AI, RI ,
AV, AVs, Ro and Ro
’. (8)
2. a)Draw the circuit of differential amplifier and explain its working principle. (8)
b)Explain and derive the expressions for differential mode gain ( ) DM A
and
common mode gain ( ) CM A
of a differential amplifier. (8)
3. a) Draw the high frequency equivalent circuit of BJT (8+8)
b) Derive an expression for its parameters.
4. a) With the help of neat diagram. Explain the characteristics of class-A amplifier
(b) Derive an expression for its efficiency and figure of merit. (8+8)
5. a) Give schematic of class B push-pull amplifier with complementary symmetry
configuration and explain the working of it.
b) What is a tuned Amplifier? What are the various types of tuned amplifiers? (10+6)
6. a) Explain about stagger tuning how it is helpful in tuned amplifiers? (6)
b) What are the characteristics of wideband amplifiers? Discuss about different
methods of compensation in wideband amplifiers? (10)
7. a) Compare different voltage regulator circuits with their merits and demerits? (10)
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Code No: X0425
b) For the given Zener regulator circuit, the supply voltage varies from 20 to 30 volts.
Load current varies from 0 to 9.5 mA, Zener breakdown occurs at 5 mA. Find the value
of Rs, RLmin, RLmax (6)
8. a) What is meant by voltage multiplier? List out the names of four different multipliers
(6)
b) Explain with neat sketch half wave voltage doubler? (10)













2 of 2

Code No: X0425
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
ELECTRONIC CIRCUIT ANALYSIS
(Com.to ECE,ETM)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. a) Explain the analysis of a CC amplifier (emitter follower) using approximate
h-parameter model and derive the expressions for AI, RI , AV, Ro and Ro
’. (8)
b) A Common Collector amplifier stage uses a transistor with the following
h-parameter values hie=1k ; hfe=100, RE=5 k , and Rs= 1k . calculate
AI, RI , AV and Ro for the CC amplifier using approximate h-parameter model
formulae. (8)

2. a)Draw the frequency response of an RC coupled amplifier and explain why gain falls at
low and high frequencies. (5)
b) Define upper cut-off and lower cut-off frequencies of a RC coupled amplifier. What
is the significance of these frequencies? (5)
c) A two-stage amplifier shown in fig. 1 is in CE-CC configuration. The transistor
parameters are given as o b
= 100 and p r
=0.5 kW. Determine the overall voltage gain
and current gain. Assume o r
= ¥. (6)
Fig. 1 Circuit for 2(c)

1 of 2



Code No: X0425
3. a) Explain in detail about the variation of hybrid parameters with respect to IC, VCE
and temperature
b) The following data are the parameters of a BJT at Ic = 5mA,Vce = 10 and at room
temperature. hie = 800W, hoe = 10-4 siemens, hfe =100, hre =10-4 ,ft=50MHz, Co=3pF
compute the values of all the hybrid p parameters. (6+10)
4. a) Describe the operation of class-B push pull amplifier (8+8)
b) Explain how the cross over distortion is minimized.
5. a) Derive the equivalent circuit of a capacitance coupled single tuned amplifier (10+6)
b) Derive the equation for voltage gain.
6. What is the need of neutralization? Explain different techniques of neutralization with
neat sketch? (16)
7. a). Draw the basic block diagram of regulated power supply and explain it with each
block? (8+8)
b). In the given Zener diode regulator circuit, Zener diode conducts if the supply voltage
Vi is greater than 20 V, Zener diode voltage is 16 V. The meter resistance is 500 ohms.
Find R1 and R2 where R1 + R2 = 99.5 k
8. a) Draw the circuit of full-wave voltage doubler circuit and explain its operation.
Mention the PIV of each diode? (8)
b) The circuit shown in the following figure is a full wave voltage multiplier. Analyze the circuit
and write down PIV rating of each diode and voltage of each capacitor (8)

Code No: X0425
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
ELECTRONIC CIRCUIT ANALYSIS
(Com.to ECE,ETM)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. a) Define the various h-parameters and give their units. (8)
b) Explain how to calculate CE h-parameters from the input and output
characteristics. (8)
2. a) Explain the advantages and disadvantages of (i) transformer coupling (ii) direct
coupling. Discuss one application of each. (8)
b) Show that gain-bandwidth product of an RC coupled amplifier constant. (8)
3. a)Draw the Hybrid - model of a transistor in CE configuration and (8+8)
give the typical values of these parameters.
b) Explain hybrid p mode of BJT with resistive load in detail.
4. a) Describe the operation of class-AB amplifier (10+6)
b) Show how even harmonics are eliminated.
5. a) Derive the equation for 3db bandwidth capacitance coupled tuned amplifier (10+6)
b) Explain about synchronous tuning of tuned amplifier with an example of a block
diagram for the system concept.
6. a) Draw and explain the working of class-C tuned amplifier with neat sketch?
b) The following data is given to class-C amplifier (8+8)
RL = 6k
Q = 80
fr = 5 MHz
VCC = 15V
Calculate the values of L and C of a tank circuit with worst case power dissipation of 20mW
7. a)Design a series regulated power supply with following specifications: (16)
Unregulated input voltage, Vin = 30 V and ro= 8
Regulated output voltage =12 V
Maximum load current = 200 mA
Control transistor, hfe = 100, hie =200
Amplitude transistor, hfe = 200, hie =1000
Reference voltage, Vref = 6 V
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Code No: X0425
Zener resistance, RZ = 10
Zener current = 20 mA
b) Also calculate its stability factor and output resistance.
c) Also draw the complete circuit diagram with the designed component values.
8. a) What are the limitations of various linear regulators? Explain. (8+8)
b) Design a adjustable regulator using LM 317 which will satisfy the requirements as
output voltage 7 to 15 V, output 1 mA.

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Code No: X0425
II B.Tech I Semester (R07) Regular Examinations, Nov- 2009
ELECTRONIC CIRCUIT ANALYSIS
(Com.to ECE,ETM)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
. a) Draw the small signal model of an FET and explain the significance of
each element. (4)
b) Draw a Common-Source n-channel JFET amplifier. Draw its small-signal
equivalent circuit and explain why VDD does not appear in the circuit. (4)
c) Show that the transconductance ‘gm’ of a JFET is related to the drain current
IDS by
gm =( 2/|Vp| ) SQRT (IDSSIDS). (8)
2. a)Draw the circuit of a cascade amplifier and derive the expressions for its (i) current
gain, I A (ii) voltage gain, V A by using the ac equivalent circuit. (8)
b)For the component values given in fig. 2, calculate the gain of the cascade circuit. dc
analysis performed on the circuit gives
I I 1 C1 C2 = =
mA and
120 o b =
. (8)
Fig. 2 AC equivalent circuit for 2(b)

3. a) Derive an expression for short circuit current gain of CE amplifier (8+8)
b)Derive an expression for fT and fb .
4. Describe the operation of class-B transformer less amplifier and complementary (16)
symmetry amplifier.
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Code No: X0425
5. a) Draw the circuit of double tuned transformer coupled amplifier. Discuss the nature of
response of the amplifier for different values of KQ = 1 ; KQ > 1 and KQ < 1. (8)
b) Design the single stage FET tuned amplifier for the following specifications
fo = 12MHz. bandwidth B =10KHz and midband voltage gain Avm = -15.The FET
parameters are gm =4ms rd=25K ohms; CGS =CDS =5pF. (8)

6. Explain the internal circuit diagram of CA 3040 video amplifier? (16)
7 a) Explain the limitations of unregulated power supplies. To derive regulated DC output
from AC mains, what are the important building blocks required. Explain about each
block. ( 8)
b). Explain the following terms (8)
i) Source regulation
ii) Output resistance
iii)Temperature stability
8. a)Draw the circuit diagram of a half wave voltage doubler circuit and explain its
operation sketch the input and output waveforms. Mention what is the PIV of diode.
What is its output voltage under no load conditions?
b) Discuss about DC to DC converters ? (10+6)














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Code No: X0524/R07 Set No. 1
II B.Tech I Semester Regular Examinations, November 2009
DIGITAL LOGIC DESIGN
( Common to Computer Science & Engineering and Information
Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Convert the following to Decimal and then to Binary.
(a) 123416
(b) ABCD16
(c) 11228
(d) 17268
(e) 99710
(f) 65410 [3+3+3+3+2+2]
2. (a) For the given Boolean function F = xy’z + x’y’z + w’xy + wx’y + wxy.
i. Draw the logic diagram
ii. Simplify the function to minimal literals using Boolean algebra.
(b) Obtain the Dual of the following Boolean expressions. [8+8]
i. AB’C + AB’D + A’B’
ii. A’B’C + ABC’ + A’B’C’D
iii. ABCD + ABC’D’ + A’B’CD
iv. AB + ABC’.
3. (a) If F1(A,B,C,D) = P(1, 3, 4, 5, 9, 10, 11) + d6, 8 And
F2(A,B,C,D) = P(0, 2, 4, 7, 8, 15) + d9, 12 Obtain minimal SOP expression
for F1 F2 using K- map and draw the circuit using NAND gates.
(b) Draw the multiple -level NAND circuit for the following Boolean - expression:
AB + CD E + BC (A + B) [8+8]
4. (a) Using five lower - order demultiplexer, construct 6 to 64 line demultiplexer
circuit. Use only block diagrams.
(b) Design a Combinational logic circuit with three inputs A, B, C and three
outputs x, y, z. If the binary input is 0, 1, 2, or 3, the binary output is one
greater than the input. When the binary input is 4, 5, 6, or 7, the binary
output is one less than the input. Draw the circuit using three-2 input AND
gates, one 3 input OR gate, one 3 input X - OR gate and one inverter. [4+12]
5. A sequential circuit with 3 D-flip-flops A, B and C has only one input ‘X’ and one
output ‘X’ with following relationship
DA = B C X, DB = A, DC = B
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Code No: X0524/R07 Set No. 1
(a) Draw the logic diagram of the circuit.
(b) Obtain logic diagram, state table and state diagram. [16]
6. (a) Explain the following systems
i. shift registers
ii. counters.
(b) Draw and explain 4-bit binary ripple counter using D- flip-flops. [10+6]
7. Tabulate the PLA programming table for the four Boolean functions:
A(x,y,z) = ( 1,2,4,6)
B(x,y,z) = ( 0,1,6,7)
C(x,y,z) = ( 2,6)
D(x,y,z) = ( 1,2,3,5,7)
Minimize the number of product terms and also show the internal logic in the PLA
structure. [16]
8. (a) Describe the analysis procedure of asynchronous sequential logic using flow
table
(b) An asynchronous sequential circuit has two internal states and one output.
The excitation and output functions describing the functions are: [6+10]
Y1 = x1x2 + x1y0
2 + x0
2y1
Y2 = x2 + x1y0
1y2 +x0
1y1
z = x2 + y1
i. Draw the logic diagram of the circuit.
ii. Derive the transition table and output map.
iii. Obtain a flow table for the circuit.
? ? ? ? ?
2 of 2
Code No: X0524/R07 Set No. 2
II B.Tech I Semester Regular Examinations, November 2009
DIGITAL LOGIC DESIGN
( Common to Computer Science & Engineering and Information
Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Perform the following using BCD arithmetic. Verify the result. [4+4]
i. 748410 + 366810
ii. 825410 + 827710
(b) Convert the following:
i. A616 = ( )10
ii. 12668 = ( )10
iii. 101000112 = ( )10
iv. 37210 = ( )16 [2+2+2+2]
2. (a) Find the complement of the following and show that F.F’ = 0 and F + F’ =
1.
i. F = xy’ + x’y
ii. F = (x + y’ + z)(x’ + z’)(x + y).
(b) Obtain the Dual of the following Boolean expressions. [8+8]
i. B’C’D + (B + C + D)’ + B’C’D’E
ii. AB + (AC)’ + (AB + C)
iii. A’B’C’ + A’BC’ + AB’C’ + ABC’
iv. AB + (AC)’ + AB’C.
3. (a) Show that: A B (A + B) = AB
(b) Show that: A C B = A B C
(c) Obtain minimal POS expression for the complement of the given expression:
F(A,B,C) = 0,3,4,6 And draw the circuit using NOR-gates. [4+4+8]
4. (a) Implement 64 × 1 multiplexer with four 16 × 1 and one 4 ×1 multiplexer.
(Use only block diagram).
(b) A combinational logic circuit is defined by the following Boolean functions.
F1 = ABC + AC
F2 = ABC + AB
F3 = ABC + AB
Design the circuit with a decoder and external gates. [8+8]
5. (a) Draw the circuit diagram of clocked D- flip-flop with NAND gates and explain
its operation using truth table. Give its timing diagram.
1 of 2
Code No: X0524/R07 Set No. 2
(b) Explain the procedure for the design of sequential circuits with example. [8+8]
6. (a) Draw and explain 4-bit universal shift register.
(b) Explain different types of shift registers. [8+8]
7. (a) Explain the block diagram of a memory unit. Explain the read and write
operation a RAM can perform.
(b) i. How many 32K * 8 RAM chips are needed to provide a memory capacity
of 256K bytes.
ii. How many lines of the address must be used to access 256K bytes? How
many of these lines are connected to the address inputs of all chips?
iii. How many lines must be decoded for the chip select inputs? Specify the
size of the decoder. [8+8]
8. (a) Describe the operation of the SR Latch using NAND gate with the help of
truth table, transition table and the circuit.
(b) Explain the operation and use of De bounce circuit. [8+8]
? ? ? ? ?
2 of 2
Code No: X0524/R07 Set No. 3
II B.Tech I Semester Regular Examinations, November 2009
DIGITAL LOGIC DESIGN
( Common to Computer Science & Engineering and Information
Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. A 12-bit Hamming code word containing 8-bits of data and 4 parity bits is read from
memory. What was the original 8-bit data word that was written in to memory if
12-bit words read out is as follows? [4×4]
(a) 001111101010
(b) 101110010110
(c) 101110110100
(d) 110011010111.
2. (a) Reduce the following Boolean expressions.
i. AB’ (C + BD) + A’B’
ii. A’B’C + (A + B + C’)’ + A’B’C’D
iii. ABCD + AB(CD)’ + (AB)’CD
iv. (A + A’)(AB + ABC’).
(b) Obtain the complement of the following Boolean expressions. [8+8]
i. ABC + A’B + ABC’
ii. (BC’ + A’D)(AB’ + CD’)
iii. x’yz + xz
iv. xy + x (wz + wz’).
3. (a) If
F1(A,B,C) = A B C
F2 (A,B,C) = A C B
Show that = F1 = F2
(b) Show that A B AB = A + B
(c) Obtain minimal SOP expression for the complement of the given expression:
F(A,B,C) = Q(1, 2, 5, 7) And draw the circuit using NOR - gates. [4+4+8]
4. (a) A combinational logic circuit is defined by the following Boolean function
f (A,B,C,D) = AB + BCD + ABD + ACD
Implement this function using 4 × 1 multiplexer and external gates.
Let A, B inputs as select lines S1, S0 of multiplexer and C, D inputs used for
data inputs.
1 of 2
Code No: X0524/R07 Set No. 3
(b) An 8 × 1 multiplexer has inputs A, B and C connected to the selection inputs
the selection inputs S2,S1, and S0 respectively. Data inputs I0 through I7 are
as follows:
[8+8]
I1 = I2 = I7 = 0; I3 = I5 =1; I0 = I4 = D; I6 = D
Determine the Boolean function that the multiplexer implements.
5. (a) Explain the operation of R-S master slave flip-flop. Explain its truth table.
(b) Explain the operation of master slave J-K flip-flop with neat sketch. Distin-
guish with edge triggering. [16]
6. (a) Explain the following systems
i. shift registers
ii. counters.
(b) Draw and explain 4-bit binary ripple counter using D- flip-flops. [10+6]
7. (a) Draw and explain the block diagram of PLA.
(b) Tabulate the PLA programmable table for the four Boolean functions given
below:
A(x,y,z) = m (1,2,4,6)
B(x,y,z) = m (0,1,6,7)
C(x,y,z) = m (2,6)
D(x,y,z) = m (1,2,3,5,7). [16]
8. (a) i. Explain the difference between asynchronous and synchronous sequential
circuits.
ii. Define fundamental-mode operation.
iii. Explain the difference between stable and unstable states.
iv. What is the difference between an internal state and a total state.
(b) Explain critical and non critical races with the help of examples. [8+8]
? ? ? ? ?
2 of 2
Code No: X0524/R07 Set No. 4
II B.Tech I Semester Regular Examinations, November 2009
DIGITAL LOGIC DESIGN
( Common to Computer Science & Engineering and Information
Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Generate Hamming code for the given 11 bit message 10001110101 and rewrite
the entire message with Hamming code.
(b) The binary numbers listed have a sign bit in the left most position and , if neg-
ative numbers are in 2’s complement form. Perform the arithmetic operations
indicated and verify the answers. [8+8]
i. 101011 + 111000
ii. 001110 + 110010
iii. 111001 - 001010
iv. 101011 - 100110.
2. (a) Express the following functions in sum of minterms and product of maxterms.
i. F (A,B,C,D) = B’D + A’D + BD
ii. F(x,y,z) = (xy + z)(xz + y).
(b) Obtain the complement of the following Boolean expressions. [8+8]
i. (AB’ + AC’)(BC + BC’)(ABC)
ii. AB’C + A’BC + ABC
iii. (ABC)’(A + B + C)’
iv. A + B’C (A + B + C’).
3. (a) If F1(A,B,C,D) = P(1, 3, 4, 5, 9, 10, 11) + d6, 8 And
F2(A,B,C,D) = P(0, 2, 4, 7, 8, 15) + d9, 12 Obtain minimal SOP expression
for F1 F2 using K- map and draw the circuit using NAND gates.
(b) Draw the multiple -level NAND circuit for the following Boolean - expression:
AB + CD E + BC (A + B) [8+8]
4. (a) Implement 64 × 1 multiplexer with four 16 × 1 and one 4 ×1 multiplexer.
(Use only block diagram).
(b) A combinational logic circuit is defined by the following Boolean functions.
F1 = ABC + AC
F2 = ABC + AB
F3 = ABC + AB
Design the circuit with a decoder and external gates. [8+8]
5. (a) Explain the following terms related to filp-flops.
1 of 2
Code No: X0524/R07 Set No. 4
i. race round conditions
ii. propagation delay
iii. clock.
(b) Explain the operation of R-S flip-flop with negative edge triggering with neat
sketch. And explain its truth table. [8+8]
6. Draw the sequential circuit for serial adder using shift registers, full adder and
D-FF. Explain its operation with state equations and state table . [16]
7. (a) Explain the block diagram of a memory unit. Explain the read and write
operation a RAM can perform.
(b) i. How many 32K * 8 RAM chips are needed to provide a memory capacity
of 256K bytes.
ii. How many lines of the address must be used to access 256K bytes? How
many of these lines are connected to the address inputs of all chips?
iii. How many lines must be decoded for the chip select inputs? Specify the
size of the decoder. [8+8]
8. (a) Describe the analysis procedure of asynchronous sequential logic using transi-
tion table.
(b) An asynchronous sequential circuit is described by the excitation and output
functions. [6+10]
Y = x1x0
2 + (x1 + x0
2)y
z = y
i. Draw the logic diagram of the circuit.
ii. Derive the transition table and output map.
iii. Obtain a two-state flow table.
iv. Describe in words the behavior of the circuit.
? ? ? ? ?
2 of 2
Code No: X0821/R07 Set No. 1
II B.Tech I Semester Regular Examinations, November 2009
ELECTRICAL ENGINEERING
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Derive the expressions for self inductance and mutual in distance in terms of
number of turns, flux and current in a coupled circuit.
(b) Determine the current supplied by the 100V battery shown in the figure1b.
Also find the power consumed in the 10
resistor across the terminals 2 and
4. [6+10]
Figure 1b
2. (a) Distinguish between average value and RMS value of an alternating current.
(b) Find the average and RMS values of the Full-wave rectified sine wave shown
in the figure2c.
(c) A balanced 3-phase star connected load of 10
per phase is connected to a
3-phase, 400V rms supply. Determine the power drawn by the load. [4+6+6]
Figure 2c
3. Explain the types of d.c. generators with the help of diagrams? [16]
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Code No: X0821/R07 Set No. 1
4. (a) List out the applications of various types of D.C. Motors.
(b) State the reasons for drop in speed of a D.c.shunt motor when it is loaded.
(c) The armature resistance of a 220 V d.c. shunt motor is 0.4
and it takes a
no-load armature current of 2 A and runs at 1,350 rpm. Find the speed when
taking an armature current of 50 A if armature weakens the flux by 2%.
[4+4+8]
5. (a) Draw the phasor diagram of a transformer on
i. no-load
ii. full-load
with inductive load and explain
(b) A Single phase transformer has 500 turns in the primary and 1200 turns in
the secondary .The cross-sectional area of the core is 80 sq.cm. If the primary
winding is connected to a 50 hz supply at 500V. Calculate
i. peak flux density
ii. voltage induced in the secondary. [8+8]
6. (a) Derive the condition for maximum torque at starting of a 3-phase induction
motor.
(b) Calculate the torque exerted by the 8-pole,50Hz Induction motor operating
with a 4% slip which develops a maximum torque of 150Kg-m at a speed of
660 rpm. The resistance per phase of the rotor is 0.5
. [8+8]
7. (a) Describe with neat sketches the constructional details of a salient pole type
Alternator
(b) Find the no-load phase and line voltage of a star-connected 3-phase, 6-pole
alternator which runs at 1200 rpm, having flux per pole of 0.1 Wb sinusoidally
distributed. Its stator has 54 slots having double layer winding. Each coil has
8 turns and the coil is chorded by one slot. [8+8]
8. (a) Why is spring control to be preferred to gravity control in an electrical
(b) Explain different types of damping Torques in an Indicting instruments.[8+8]
? ? ? ? ?
2 of 2
Code No: X0821/R07 Set No. 2
II B.Tech I Semester Regular Examinations, November 2009
ELECTRICAL ENGINEERING
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Two coils in series, when measured give the total inductance values as 0.7H
and 0.6H, depending on the connection, one coil alone is found to have 0.45H.
Find the mutual inductance of the coils and the coupling coefficient.
(b) Find the current through the 10
resistor, voltage across 5A current source
and power dissipated in 30
resistor shown in the figure 1b. [8+8]
Figure 1b
2. (a) Describe the relationship between line and phase quantities in a balanced delta
connected system.
(b) Determine the power factor, true power, reactive power and apparent power
in the circuit (figure2b). [8+8]
Figure 2b
3. A 60Kw, 240V shunt compound generator operates as a shunt generator required
a increase of field current of 3A to provide an over compensated voltage of 275V at
rated load current of 250A. The shunt field has 200 turns per pole and the series
field 5 turns per pole with resistance of 240
and 0.005
respectively
(a) Calculate the required diverter resistance
(b) If the no load voltage of the compound generator is also 240V, Calculate the
air gap mmf/pole at no load and at full load? [16]
4. (a) Explain the various methods of speed control of a D.C.shunt motor
1 of 2
Code No: X0821/R07 Set No. 2
(b) A 460V D.C series motor run at 1000rpm, taking a current of 40A. Calculate
the speed and percentage change torque if the load is reduced so that the
motor taking 30A. Total resistance of the armature and field circuits is 0.8
.
(Assume flux is proportional to field current). [8+8]
5. (a) Define regulation of a transformer. Derive the expression for the regulation
(b) A 1− transformer, is supplied 6000V .The terminal voltage on the secondary
side when loaded at power factor 0.8 is 254V. The equivalent resistance and
reactance drops are 1% and 5%. Find the turns ratio. [6+10]
6. (a) Explain the principle of operation of a three phase induction motor.
(b) A 3- , 4-pole,1440rpm,50Hz Induction motor has star connected rotor wind-
ing, having a resistance of 0.2
/phase and stand still leakage of 1
/phase.
when the stator is energized at rated voltage and frequency, the rotor induced
emf at stand still is 120V/phase.
i. calculate the rotor current , rotor power factor and torque both at starting
and at full load and compare the results.
ii. If the external resistance of 1
/phase is inserted in rotor circuit, calculate
rotor current rotor power factor and torque at the time of starting.[6+10]
7. (a) Write the advantages of stationary armature of stationary Armature and ro-
tating field in an Alternator
(b) From the following test results, determine the voltage regulation of a 2000-V,
I-phase alternator delivering a current of 100 A at
i. unity p.f.
ii. 0.8 leading p.f. and
iii. 0.71 lagging p.f. [6+10]
8. (a) Explain the Advantages & Disadvantages of MI Instruments
(b) The deflecting torque of an ammeter varies as the square of the current passing
through it . If a current of 5A produces a deflection of 900 .Find the value of
current required for a deflection of 300 . if the instrument is
i. Spring control
ii. Gravity control. [8+8]
? ? ? ? ?
2 of 2
Code No: X0821/R07 Set No. 3
II B.Tech I Semester Regular Examinations, November 2009
ELECTRICAL ENGINEERING
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Derive the relation ship between the self inductances L1 and L2 the mutual
inductances M of two coupled coils.
(b) For the network shown (figure1b), calculate the voltage across the terminals
ac if a 36V battery is connected across the terminals ab. Also calculate the
power dissipated in the 9
resistor connected across ab. [6+10]
Figure 1b
2. (a) Explain about active, reactive and apparent powers. Give expression for the
above. Draw the power triangle.
(b) Determine the value of the voltage source and power factor in the following
network, if it delivers a power of 100W to the circuit shown. Find also the
reactive power drawn from the source (figure2b). [8+8]
Figure 2b
3. In a dc-machine the total iron loss is 8kw at its rated speed if the excitation remains
the same, but speed is reduced by 25% , the total iron loss is found to be 5kw.
Calculate the hysterisis and eddy current losses at
(a) full speed
(b) half the rated speed. [16]
1 of 2
Code No: X0821/R07 Set No. 3
4. (a) Explain the working of a 3-point starter with a circuit. Diagram for a D.C.Shunt
motor
(b) A dc shunt machine develops an O,C emf of 250V at 1500rpm. Find its Torque
and its mechanical power developed for armature current of 50A. State the
simplifying assumption. [8+8]
5. (a) Derive the emf equation of a 1− transformer and draw the no-load phasor
diagram
(b) A 1− transformer has 360 turns on the primary and 180 turns on the sec-
ondary. The respective resistance are 0.233
AND 0.067
. Calculate the
equivalent resistance of
i. the primary in terms of secondary windings
ii. the secondary in terms of primary windings and
iii. the total resistance of the transformer in terms of primary. [6+10]
6. (a) Derive the torque equation of an induction motor.
(b) A 6 pole, 50Hz squirrel cage induction motors run on load at a shaft speed of
970rpm calculate
i. % slip
ii. The frequency of induced current in the rotor. [6+10]
7. (a) Discuss the construction, and principle of operation of a 3-phase Synchronous
Generator.
(b) A 3-phase, 4-pole, 50-Hz , star-connected alternator has 60 slots with 2 con-
ductors per slot and having armature winding of the double layer type. Coils
are short-pitched, that is, if one coil side lies in slot number I, the other coil
side lies in slot number 13. find the useful flux per pole required to induce a
line voltage of 6.6 kv. [8+8]
8. (a) Explain the errors and compensations involved in a PMMC Instruments
(b) A 1mA ammeter movement with an internal resistance of 100
is to be
converted into a 0-100mA ammeter. Calculate the shunt resistance required.
What particulars should be specified on the shunt. [8+8]
? ? ? ? ?
2 of 2
Code No: X0821/R07 Set No. 4
II B.Tech I Semester Regular Examinations, November 2009
ELECTRICAL ENGINEERING
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Explain Faraday’s laws of electromagnetic induction and Lenz’s Law.
(b) Find the equivalent resistance between the terminals ‘a’ & ‘b’ shown in the
figure1b. [6+10]
Figure 1b
2. (a) Define RMS value and Average Value of an alternating current..
(b) For the circuit shown, determine the true power, reactive power and apparent
power in each branch. What is the power factor of the total circuit(figure2b)?
[4+12]
Figure 2b
3. (a) Determine the condition for maximum efficiency of a D.C generator?
(b) A d. c. generator generates on e.m.f. of 520V if has 2,000 armature conduc-
tors, flux per pole of 0.013 wb, speed of 1200 r.p.m and the armature winding
has four parallel pathe. Fine the number of poles.
(c) Calculate the flux in a 4-pole dynemi with 722 armature conductors generating
500V when running at 1000 r.p.m. When the armature is
i. lap connected
ii. wave connected. [16]
1 of 2
Code No: X0821/R07 Set No. 4
4. (a) Explain how the torque of a D.C. Shunt and D.C. series motor varies with the
speed of the motor
(b) The speed of a 50 H.p series motor working on 500V supply is 750 rpm at
full load and 90% efficiency. If the load torque is made 350 N-m and a 5

resistance is connected in series with machine, calculate the speed at which
the machine will run. Assume the magnetic circuit to be unsaturated and the
armature and field resistance to be 0.5
. [8+8]
5. (a) Derive the emf equation of a 1− transformer and draw the no-load phasor
diagram
(b) A 1− transformer has 360 turns on the primary and 180 turns on the sec-
ondary. The respective resistance are 0.233
AND 0.067
. Calculate the
equivalent resistance of
i. the primary in terms of secondary windings
ii. the secondary in terms of primary windings and
iii. the total resistance of the transformer in terms of primary. [6+10]
6. (a) sketch torque-speed characteristics of an induction motor at rated voltage and
frequency.
(b) Calculate the torque exerted by the 8-pole,50Hz Induction motor operating
with a 4% slip which develops a maximum torque of 150Kg-m at aspeed of
660 rpm. The resistance per phase of the rotor is 0.5
. [8+8]
7. (a) Explain the principle of operation of an Alternator
(b) Why the Alternator is also named as Synchronous Generator
(c) The effective resistance of a 2200 V, 50 Hz , 440kVA 1-phase alternator is 0.5

, on short circuit a field current of 40 A gives the full load current of 200
A. The emf on open-circuit with the same excitation is 1,160 V. Calculate the
synchronous impendence and reactance. [5+5+6]
8. (a) Explain the different types of Torques for an Indicating instruments
(b) The coil of a moving coil meter has resistance of 5 and given full scale deflection
when a current of 15 mA passes through it .What modification must be made
to the instrument to convert it into
i. an ammeter reading to 15 A
ii. a voltmeter reading to 15 V. [8+8]
? ? ? ? ?
2 of 2
Code No: W2322
II B.Tech I Semester (R07) Regular Examinations, Nov,- 2009
THERMODYNAMICS FOR BIOTECHNOLOGISTS
(Biotechnology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. Write in detail about First law and Second law of Thermodynamics.
2. A non conducting container filled with 25 kg of water at 20 0 C is fitted with a stirrer, which
is made to turn by gravity acting on a weight of mass 35 kg. The weight falls slowly through a
distance of 5 m in driving the stirrer. Assuming that all work done on the weight is transferred to
the water and that the local acceleration of gravity is 9.8 m s-2, determine.
a) The amount of work done on the water.
b) The internal – energy of the water.
c) The final temperature of the water, for which Cp = 4.18 kJ kg-10C-1.
d) The amount of heat that must be removed from the water to return it to its initial
temperature.
3. Define the “Yield coefficient” and the explain its significance in the growth of cells by
substrate utilization.
The following is the stoichiometric equation for combustion of the cell Pseudomonas
fluorescens growing in glucose medium.
C H1.66 N0.2 O0.27+ 1.28 O2 ------------- CO2 + 0.1 N2 + 0.83 H2O
Assuming the heat of combustion of 104 kcal per mole O2, calculate the heat released by
combustion of bacteria in k cal / gram.
4. Describe and discuss the commonly used models for excess Gibbs energy.
5. State the commonly used property functions in thermodynamics and write the
Maxwell Equations
6. Discuss in detail about Elemental balance.
7. a) State the reasons for non ideal behavior of the system?
b) Write the unsteady state equations for CSTR and Plug flow reactor.
8. Write about solid liquid equilibrium?



Code No: W2322
II B.Tech I Semester (R07) Regular Examinations, Nov,- 2009
THERMODYNAMICS FOR BIOTECHNOLOGISTS
(Biotechnology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. Discuss in detail about first law of thermodynamics with example.
2. Write short notes:
a) Explain the Carnot refrigeration cycle.
b) Write about the air refrigeration cycle.
c) Compare the refrigeration cycles.
d) Write about the choice of refrigerant.
3 . a) Write about equilibrium and phase rule?
b) Calculate degrees of freedom for the fallowing systems
i) Liquid water is in equilibrium with its vapor.
ii) Liquid water is in equilibrium with mixture of water vapor and nitrogen
iii) A solution of alcohol in water is in contact with its vapor.
4. Assume that experimental measurements of a certain organism have shown that cells can
convert two-thirds (wt/wt) of the substrate carbon (alkane or glucose) to biomass.
a) Calculate the stoichiometric coefficients for the following biological reactions.
Hexadecane: C16 H34 + aO2 + c(C4.4 H7.3 N0.86 O1.2 ) + dH2O + e CO2
Glucose : C6H122O6 + aO2 + bNH3 ---- dH2O + eCO2.
b) Calculate the yield coefficients Yx/s (g dw cell / g substrate ), Y x/O2 (g dw cell/gO2) for
both reactions. Comment on the differences.
5. Write about Maxwell Equations.
6. a) What do you mean by chemical potential
b) Derive the Gibbs Duhem equation
7. a) State the reasons for non ideal behavior of the system?
b) Derive the unsteady state material balance equations for CSTR and Plug flow
reactor.
8. Write about equilibrium existing between liquid – liquid mixtures?


Code No: W2322
II B.Tech I Semester (R07) Regular Examinations, Nov,- 2009
THERMODYNAMICS FOR BIOTECHNOLOGISTS
(Biotechnology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks

1. a) Discuss first law and second law of thermodynamics.
b) Derive the mathematical expression for the steady sate flow process by the first law
of thermodynamics.
2. Steam at 200 psia and 600 0 F (state 1) enter a turbine through a standard 3-in. pipeline with a
velocity of 10 ft/sec. The exhaust from the turbine is carried through a standard 10-in.
pipeline and is at 4 psia and 160 0 F (state 2)
Data: H1 = 1321. 4 Btu/lb M v1 = 3.059 ft3/ lbM
H2 = 1129. 3 Btu/lb M v2 = 92.15 ft3/ lbM
What is the power output of the turbine in horsepower, assuming no heat losses?
3. Discuss in detail about Elemental balance.
4. a)What is chemostat.
a)A chemostat operating under steady state conditions with biomass production according to
monod kinetics. Assume that maximum specific growth rate is 1 hr-1
And the saturation constant is 500 mg/liter. The feed is sterile and contains 10 g/liter of the
carbon substrate. The feed flow rate is 300 liters/hour. The volume of liquid in the fermentor
is 1000 liters. The biomass yield is 0.5 g dry biomass/ g substrate consumed.
i) Determine steady state concentration of biomass and substrate for the given conditions.
i) Determine the dilution rate for the given kinetics and feed concentration.
5. Write about Maxwell equations.
6. Derive Gibbs Duhem Equation for ideal solutions
7. Discuss Solid liquid equilibrium.
8. What is equilibrium constant and what are the different factors affecting the equilibrium
constant in homogeneous reactions



Code No: W2322
II B.Tech I Semester (R07) Regular Examinations, Nov,- 2009
THERMODYNAMICS FOR BIOTECHNOLOGISTS
(Biotechnology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. Derive the mathematical expression for the steady sate flow process by the first law of
thermodynamics.
2. A power-plant cycle is an follows:
a) Saturated liquid water from the condenser at 5 psig in pumped into a boiler operating at 175
psia.
b) The steam leaves the boiler superheated 150 0 F.
i). Assuming the condenser and boiler pressures are constant, calculate the maximum
efficiency of the cycle ( i.e for a reversible adiabatic turbine).
ii). For comparison calculate the efficiency of a Carnot cycle operating between the saturation
temperature at the boiler and the condenser pressures. Make the same calculation for the
Carnot engine absorbing heat at the temperature of the steam leaving the boiler and
discarding heat at the saturation temperature in the condenser.
iii). Calculate the efficiency of the cycle if the turbine operates adiabatically but irreversibly in
such a way that the actual H is 0.9 of the isentropic H
3. Assume that experimental measurements for a certain organism have shown that cells can
convert two-thirds (wt/wt) of the substrate carbon (alkane or glucose) to biomass.
a) calculate the stoichiometric coefficients for the following biological reactions.
Hexadecane: C16 H34 + aO2 + c(C4.4 H7.3 N0.86 O1.2 ) + dH2O + e CO2
Glucose : C6H122O6 + aO2 + bNH3 ---- dH2O + eCO2.
b) Calculate the yield coefficients Yx/s (g dw cell / g substrate ), Y x/O2 (g dw cell/gO2) for
both reactions. Comment on the differences.
4. Define the “Yield coefficient” and the explain its significance in the growth of cells by
substrate utilization.
The following is the stiochiometric equation for combustion of the cell Pseudomonas
fluorescens growing in glucose medium.
C H1.66 N0.2 O0.27+ 1.28 O2 ------------- CO2 + 0.1 N2 + 0.83 H2O
Assuming the heat of combustion of 104 kcal per mole O2, calculate the heat released by
combustion of bacteria in k cal / gram.
5. Write Maxwell equations and their applications
6. a) What is fugasity coefficient and chemical potential
b) Derive Gibbs Duhem equation
7. Write about equilibrium existing between liquid – liquid mixtures?
8. a) What are the different factors that effect the equilibrium constant?
b) Write about the Arrhenius law?