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Electrical Machines Multiple Choice Questions | MCQs | Quiz

Electrical Machines Interview Questions and Answers
Practice Electrical Machines questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Energy Principles
•   Singly Magnetic System
•   Reluctance Motor
•   Doubly Magnetic System
•   Synchronous Machines
•   Singly Electric Systems
•   Torque Equations
•   Rotating Machines Terms
•   Rotating Magnetic Field-1
•   Rotating Magnetic Field-2
•   Rotating EM - 1
•   Rotating EM - 2
•   Rotating EM - 3
•   Generated Emfs
•   Losses and Efficiency-1
•   Losses and Efficiency-2
•   Machine Ratings
•   Cooling(Loss Dissipation)
•   Machine Applications
•   Commutator Action
•   Armature Generation
•   DC Machines Torque
•   DC Machines Circuits
•   Excitation Methods
•   MMF & Flux Waveforms
•   Compensation Winding
•   DC Machines Testing
•   DC Machine Applications
•   Generator Characteristics
•   Rotating Amplifiers
•   Motors Characteristics
•   DC Motors Basics
•   DC Motors Speed Control
•   DC Motors Magnet
•   EMF Polygon - 1
•   EMF Polygon - 2
•   Non-Salient Machines
•   Distributed Windings
•   Synchronous Machines
•   Flux & MMF Phasors
•   Synchronous Operation
•   Synchronous Controls
•   Salient Pole Machines
•   Characteristics
•   Xd & Xq Measurement
•   Applications
•   Cylindrical Rotor
•   Voltage Regulation
•   Alternator Characteristics
•   Motors Phasor Diagram
•   Motor Power Factor
•   Motors Basics
•   Inductive Impedance - 1
•   Inductive Impedance - 2
•   Efficiency
•   Losses & Efficiency
•   Power & Torque
•   Synchronous Stability
•   Damper Winding
•   Induction Motor
•   Operation Principles
•   MMF Phasors & Waves
•   Rotor Frequency
•   EMF, Current & Power
•   Induction Motor Phasor
•   Equivalent Circuit
•   Circuit Analysis
•   Motor Characteristics
•   Circuit Parameters
•   Three Phase Motor
•   Induction Generator
•   Polyphase Induction
•   Induction Diagrams
•   Polyphase Motors - 1
•   Polyphase Motors - 2
•   Armature Windings
•   Transformer Construction
•   Ideal Two Winding
•   Phasor Diagrams
•   Transformer Circuit
•   Open & Short Circuit Test
•   Voltage Regulation
•   Transformer Efficiency
•   Single Phase
•   Magnetically Coupled
•   Three Phase Transformer
•   Autotransformers

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Electrical Machines Questions and Answers – Hunting and Damper Windings

Posted on May 19, 2017 by Manish

This set of Electrical Machines Interview Questions and Answers for freshers focuses on “Hunting and Damper Windings”.

1. The relative speed between rotor and stator field is zero. This means
a) mechanical speed of rotor is equal to stator field speed
b) mechanical speed is zero
c) stator field is stationary
d) none of the mentioned
View Answer

Answer: a
Explanation: The relative speed is between the rotor and the stator field.
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2. The satisfactory operation of the synchronous machine means
a) mechanical speed of rotor is equal to stator field speed
b) mechanical speed is zero
c) stator field is stationary
d) none of the mentioned
View Answer

Answer: a
Explanation: The relative speed should be zero between the rotor and the stator field.

3. Variation of load angle delta, after sudden loading of an unloaded synchronous motor with no damping is
a) electrical-machines-interview-questions-answers-freshers-q3a
b)electrical-machines-interview-questions-answers-freshers-q3b
c)electrical-machines-interview-questions-answers-freshers-q3c
d)electrical-machines-interview-questions-answers-freshers-q3d
View Answer

Answer: a
Explanation: With no damping there will be oscillations in the rotor angle.

4. Variation of load angle delta, with loading of an unloaded synchronous motor with damping is
a)electrical-machines-interview-questions-answers-freshers-q4a
b)electrical-machines-interview-questions-answers-freshers-q3a
electrical-machines-interview-questions-answers-freshers-q3c
d)electrical-machines-interview-questions-answers-freshers-q3d
View Answer

Answer: a
Explanation: With damping the load angle damps out to nominal value.

5. Effects of hunting are/is
a) mechanical stress
b) surge in current
c) rise in temperature
d) all of the mentioned
View Answer

Answer: d
Explanation: Hunting causes all the mentioned effects on the synchronous machine.

6. The probable causes of hunting is
a) sudden change in load
b) fault in supply
c) sudden change in field current
d) all of the mentioned
View Answer

Answer: d
Explanation: Changing the load suddenly, excitation or the faults will cause transients in the machine.
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7. Using a _____ can be used to limit hunting
a) Flywheel
b) DC Exciter
c) Large load
d) Any of the mentioned
View Answer

Answer: d
Explanation: Any method mentioned will diminish the transients in the machine.

8. Employment of damper winding will reduce hunting.
a) True
b) False
View Answer

Answer: a
Explanation: Damper winding are mechanical windings which also reduce the hunting.

9. Damper windings are made of
a) copper
b) iron
c) silicon
d) cast iron
View Answer

Answer: a
Explanation: They are made of copper as the current also flows through them.

10. The damper winding are placed in
a) pole shoes
b) series with armature
c) series with field
d) rotor slots
View Answer

Answer: a
Explanation: The damper winding are placed in pole shoes.

11. Turbo generators do not use damper winding due to
a) solid steel rotor core
b) laminated armature
c) soft iron core
d) small current flow in pole shoes
View Answer

Answer: a
Explanation: Because eddy current in the q-axis produce the same effect as the damper in salient pole machine.

12. Damper winding should have
a) high resistance
b) low starting torque
c) low resistance
d) low reactance
View Answer

Answer: c
Explanation: For desired hunting, the damper winding should have low resistance.
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13. At synchronous speed, relative speed between rotating air-gap flux and damper is
a) zero
b) Ns
c) lesser than Ns
d) more than zero
View Answer

Answer: a
Explanation: It is zero.

14. When the rotor speed becomes greater than synchronous speed, which type of torque is produced in damper winding?
a) Induction generator
b) Synchronous generator
c) Reluctance motor
d) Induction motor
View Answer

Answer: a
Explanation: The slip will become negative and it will operate in generating mode.

15. When an alternator is loaded suddenly the torque produced in damper is?
a) Induction motor
b) Induction generator
c) Synchronous motor
d) Synchronous generator
View Answer

Answer: a
Explanation: Sudden loading will reduce the speed of the machine and so there will be small slip induced in the machine, making it operate as induction motor.

Sanfoundry Global Education & Learning Series – Electrical Machines.
To practice all areas of Electrical Machines for Interviews, here is complete set of 1000+ Multiple Choice Questions and Answers.

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  10. Electrical Machines Questions and Answers – Induction Motor as a Transformer
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