Hunting and Damper Windings

Electrical Machines Questions and Answers – Synchronous Machine Stability

Hunting and Damper Windings

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Damper windings are made of

cast iron

copper

silicon

iron

Correct!

Wrong!

-

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When an alternator is loaded suddenly the torque produced in damper is?

Induction motor

Induction generator

Synchronous generator

Synchronous motor

Correct!

Wrong!

-

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At synchronous speed, relative speed between rotating air-gap flux and damper is

lesser than Ns

Ns

more than zero

zero

Correct!

Wrong!

-

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The damper winding are placed in

series with field

pole shoes

series with armature

rotor slots

Correct!

Wrong!

-

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Employment of damper winding will reduce hunting.

True

False

Correct!

Wrong!

-

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Variation of load angle delta, with loading of an unloaded synchronous motor with damping is

 

 

 

 

Correct!

Wrong!

-

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Effects of hunting are/is

all of the mentioned

surge in current

mechanical stress

rise in temperature

Correct!

Wrong!

-

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The probable causes of hunting is

sudden change in field current

sudden change in load

fault in supply

all of the mentioned

Correct!

Wrong!

-

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Turbo generators do not use damper winding due to

soft iron core

laminated armature

small current flow in pole shoes

solid steel rotor core

Correct!

Wrong!

-

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The relative speed between rotor and stator field is zero. This means

stator field is stationary

mechanical speed is zero

none of the mentioned

mechanical speed of rotor is equal to stator field speed

Correct!

Wrong!

-

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Using a _____ can be used to limit hunting

Flywheel

Any of the mentioned

Large load

DC Exciter

Correct!

Wrong!

-

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The satisfactory operation of the synchronous machine means

none of the mentioned

stator field is stationary

mechanical speed of rotor is equal to stator field speed

mechanical speed is zero

Correct!

Wrong!

-

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Damper winding should have

low starting torque

high resistance

low reactance

low resistance

Correct!

Wrong!

-

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When the rotor speed becomes greater than synchronous speed, which type of torque is produced in damper winding?

Synchronous generator

Reluctance motor

Induction generator

Induction motor

Correct!

Wrong!

-

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Variation of load angle delta, after sudden loading of an unloaded synchronous motor with no damping is

 

 

 

 

Correct!

Wrong!

-

Continue >>

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