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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?
S
1/S
1-S
1/(1-S)
S
1/S
1-S
1/(1-S)
Answer
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Related Question
Electrical Machines
Cross magnetization effects which of the following?
reduction in main field flux
commutation
reduces the terminal voltage
both 2 and 3
reduction in main field flux
commutation
reduces the terminal voltage
both 2 and 3
Answer
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Electrical Machines
DC Motor
dc series motor.
dc shunt with armature resistance control.
dc compound motor.
dc shunt motor with field weakening.
dc series motor.
dc shunt with armature resistance control.
dc compound motor.
dc shunt motor with field weakening.
Answer
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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of
Armature current.
Field current.
Line current.
None of above.
Armature current.
Field current.
Line current.
None of above.
Answer
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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is
3 only
1, 2 and 3
1, 2, 3 and 4
1, 3
3 only
1, 2 and 3
1, 2, 3 and 4
1, 3
Answer
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Electrical Machines
Ward-Leonard control is basically a ___________ control method.
Armature voltage control.
Field control.
Field diverter control.
Armature resistance control.
Armature voltage control.
Field control.
Field diverter control.
Armature resistance control.
Answer
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