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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sinδ
 sin2δ
 cosδ
 cos2δ

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Copper losses
 Eddy current losses
 Both 1 and 2

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Electrical Machines
The armature resistance of the dc motor is generally of the range

 50 ohm.
 100 ohm.
  0.1 ohm.
  0.5 ohm.

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Electrical Machines
Which of the following rotor requires damper winding?

 Cylindrical rotor.
 Salient pole rotor.
 Both type rotor.
None of these

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 180.
  270.
 30.
 45.

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 locking.
 crawling.
 plugging.
 cogging.

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MORE MCQ ON Electrical Machines

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