Download AKTU B-Tech 4th Sem 2018-19 REE409 Electrical Machines And Controls Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU)) B-Tech 4th Semester (Fourth Semester) 2018-19 REE409 Electrical Machines And Controls Question Paper

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REE409
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Printed Pages:02 Sub Code:REE-409
Paper Id: 120255 Roll No.

BTECH
(SEM-IV) THEORY EXAMINATION 2018-19
ELECTRICAL MACHINES AND CONTROLS
Time: 3 Hours Total Marks: 70
Note: 1. Attempt all Sections. If require any missing data; then choose suitably.

SECTION A
1. Attempt all questions in brief. 2 x 7 = 14
a. What are the properties of Ideal Transformer?
b. What is transfer function? Explain Poles and Zeros of transfer function.
c. Write the rules for Block diagram reduction.
d. Write the difference between open loop and closed loop system.
e. What is Synchronous Condenser?
f. Define static and dynamic system.
g. List the feature of AC servo motor.

SECTION B
2. Attempt any three of the following: 7 x 3 = 21
a. Derive equation of torque developed by 3 phase induction motor. Draw typical
torque slip curve and the deduce condition for maximum torque.
b. Derive the Expression for EMF equation of transformer and list the losses in
transformer.
c. Write the difference between Synchronous motor and Induction Motor.
d. Derive the Expression of Slip in 3-Phase Induction motor. What is the value at
starting and at synchronous speed.
e. Discuss the PI and PD controller with their application.

SECTION C
3. Attempt any one part of the following: 7 x 1 = 7
(a) Derive the transfer function of the R-C network of a given network.








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FirstRanker.com
| 22-May-2019 09:08:19 | 45.115.62.2
FirstRanker.com | 22-May-2019 09:08:19 | 45.115.62.2
REE409
Page 1 of 2

Printed Pages:02 Sub Code:REE-409
Paper Id: 120255 Roll No.

BTECH
(SEM-IV) THEORY EXAMINATION 2018-19
ELECTRICAL MACHINES AND CONTROLS
Time: 3 Hours Total Marks: 70
Note: 1. Attempt all Sections. If require any missing data; then choose suitably.

SECTION A
1. Attempt all questions in brief. 2 x 7 = 14
a. What are the properties of Ideal Transformer?
b. What is transfer function? Explain Poles and Zeros of transfer function.
c. Write the rules for Block diagram reduction.
d. Write the difference between open loop and closed loop system.
e. What is Synchronous Condenser?
f. Define static and dynamic system.
g. List the feature of AC servo motor.

SECTION B
2. Attempt any three of the following: 7 x 3 = 21
a. Derive equation of torque developed by 3 phase induction motor. Draw typical
torque slip curve and the deduce condition for maximum torque.
b. Derive the Expression for EMF equation of transformer and list the losses in
transformer.
c. Write the difference between Synchronous motor and Induction Motor.
d. Derive the Expression of Slip in 3-Phase Induction motor. What is the value at
starting and at synchronous speed.
e. Discuss the PI and PD controller with their application.

SECTION C
3. Attempt any one part of the following: 7 x 1 = 7
(a) Derive the transfer function of the R-C network of a given network.








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REE409
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(b) Draw the free body diagram and write the differential equation of the given
system shown in figure.
4. Attempt any one part of the following: 7 x 1 = 7
(a) A second order system is given by
C(s) 25
-------- = -------------------
R(s) s
2
+6s+25
Find its rise time,peak time, peak overshoot and settling time if subjected to
unit step input.Also calculate expression for its output response.
(b) Explain Single Phase Induction motor and give its two applications.
5. Attempt any one part of the following: 7 x 1 = 7
(a) Discuss the Speed Control methods of DC Motor.
(b) By means of Routh Stability, determine the stability of the system represented
by the characteristics equation
s
5
+ 4s
4
+8s
3
+8s
2
+7s=4=0
6. Attempt any one part of the following: 7 x 1 = 7
(a) Name the various methods of Starting of poly phase induction motor and
describe one method in detail.
(b) The transfer function of a unity feedback system is given by
K
G(s)= ---------------------
S(S+4)(S+5)
Sketch the root locus as K varies from zero to infinity.
7. Attempt any one part of the following: 7 x 1 = 7
(a) Construct the bode plot for a Unity feedback control system having transfer
function
1000
G(s) = -----------------
S(S+1)(s+100)

And determine Phase margin and Gain Margin.
(b) Draw the polar plot for
6
G(s)= ------------------------
(S+1)(S+2)


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