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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2.5Hz
 50Hz
 1 Hz
 2HZ

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Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Field.
 Armature.
 Coupling mounted on the shaft.

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 AC of supply frequency.
 DC.
 A modulated supply frequency AC voltage with slip frequency envelop.
  DC of slip frequency.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 personal computers as cooling fan
 food mixers
 wet grinders
 tape recorders

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave
 half wave controlled
 full wave controlled
 full wave

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 armature winding
 field winding
 interpole winding
 interpole and compensating windings together

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