Electrical Machines Questions and Answers – Hunting and Damper Windings

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
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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
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3. Variation of load angle delta, after sudden loading of an unloaded synchronous motor with no damping is?
a)
b)
c)
d)
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4. Variation of load angle delta, with loading of an unloaded synchronous motor with damping is?
a)
b)
c)
d)
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5. Effects of hunting are/is ___________
a) mechanical stress
b) surge in current
c) rise in temperature
d) all of the mentioned
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6. What are the probable causes of hunting?
a) sudden change in load
b) fault in supply
c) sudden change in field current
d) all of the mentioned
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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
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8. Employment of damper winding will reduce hunting.
a) True
b) False
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9. Damper windings are made of ___________
a) copper
b) iron
c) silicon
d) cast iron
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10. The damper winding are placed in ___________
a) pole shoes
b) series with armature
c) series with field
d) rotor slots
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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
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12. Damper winding should have ___________
a) high resistance
b) low starting torque
c) low resistance
d) low reactance
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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
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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
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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
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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.