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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 Induction motor.
 DC shunt.
  DC series.
 DC compound.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = P/2*ωm
 ωe = P*ωm
 ωe = ωm
 ωe = 2/P*ωm

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Open fuse or circuit breaker.
 Draw too much current.
 Produce sparking at brushes.
  Develop excessive speed and damage itself.

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

 tape recorders
 personal computers as cooling fan
 food mixers
 wet grinders

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Electrical Machines
In DC generator, lap winding is used in

 high voltage and low current applications.
  high current and low voltage applications.
 where constant speed is required.
 where greater load is connected.

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 50 Hz
 100 Hz
 0 Hz

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MORE MCQ ON Electrical Machines

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