Download PTU M.Tech. EE 2nd Semester 71358 MODELING AND DYNAMICS OF ELECTRICAL MACHINES Question Paper

Download PTU. I.K. Gujral Punjab Technical University (IKGPTU) M.Tech. EE 2nd Semester 71358 MODELING AND DYNAMICS OF ELECTRICAL MACHINES Question Paper.

1 | M-71358 (S9)-1715

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech.(EE) (2013 Batch) (Sem.?2)
MODELING AND DYNAMICS OF ELECTRICAL MACHINES
Subject Code : MTEE-203
M.Code : 71358
Time : 3 Hrs. Max. Marks : 100

INSTRUCTION TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWENTY marks.

1. a) What is generalized machine theory? What are the restrictions of generalized machine
theory?
b) Obtain the transfer function of a D.C. separately excited machine. Neglect only
frictional torque and also write the formulae for undamped natural angular frequency
and damping factor.
2. a) Develop machine model for a D.C. compound machine, with the help of neat
schematic diagram and primitive diagram. Arrange the final equations in state space
form.
b) For a voltage-fed synchronous motor develop the relevant voltages in state variable
form.
3. a) What do you understand by the term 'Linear Transformation' as used in electrical
machines?
b) Obtain the expressions for a 3-phase induction motor (Voltage and current) in state
variable form in:
i) Stator reference frame
ii) Synchronously rotating frame.
4. a) Derive and obtain expressions for flux linkages in the two-axis model for a 3-phase
induction motor from ?
a
and ?
b
and ?
c
values.
b) Discuss linearized and non-linearized analysis of induction machine?
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1 | M-71358 (S9)-1715

Roll No. Total No. of Pages : 02
Total No. of Questions : 08
M.Tech.(EE) (2013 Batch) (Sem.?2)
MODELING AND DYNAMICS OF ELECTRICAL MACHINES
Subject Code : MTEE-203
M.Code : 71358
Time : 3 Hrs. Max. Marks : 100

INSTRUCTION TO CANDIDATES :
1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWENTY marks.

1. a) What is generalized machine theory? What are the restrictions of generalized machine
theory?
b) Obtain the transfer function of a D.C. separately excited machine. Neglect only
frictional torque and also write the formulae for undamped natural angular frequency
and damping factor.
2. a) Develop machine model for a D.C. compound machine, with the help of neat
schematic diagram and primitive diagram. Arrange the final equations in state space
form.
b) For a voltage-fed synchronous motor develop the relevant voltages in state variable
form.
3. a) What do you understand by the term 'Linear Transformation' as used in electrical
machines?
b) Obtain the expressions for a 3-phase induction motor (Voltage and current) in state
variable form in:
i) Stator reference frame
ii) Synchronously rotating frame.
4. a) Derive and obtain expressions for flux linkages in the two-axis model for a 3-phase
induction motor from ?
a
and ?
b
and ?
c
values.
b) Discuss linearized and non-linearized analysis of induction machine?
2 | M-71358 (S9)-1715

5. a) Derive torque equation for a 3-phase synchronous motor model and obtain steady
state power angle characteristics based on its torque expression.
b) Explain phase transformation and Active transformation used in a.c. machines.
6. a) Derive the circuit model of a 3-phase synchronous motor and mention few salient
features from its model.
b) Derive expressions for armature to field mutual inductances and armature self-
inductances for a salient-pole synchronous machine. How are these inductance
expressions modified for a cylindrical rotor synchronous machine?
7. A 3-phase, 50Hz cylindrical rotor synchronous machine has the following parameters :
Self-inductance for phase ?a? = 3.15 mH.
Armature leakage inductance = 0.35 mH.
For this machine, calculate the mutual inductance between armature phases and its
synchronous reactance.
8. Write notes on the followings :
a) Transient stability of synchronous machines
b) Basic challenges in computer simulations
c) Circuit oriented simulator Pspice
d) Surge voltage transients in transformers.





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This post was last modified on 13 December 2019