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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 74
 37
 72
 36

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 both A and B
 mechanical loss
 iron loss
 copper loss

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Electrical Machines
The emf induced in the dc generator armature winding is

 AC
 AC and DC
 DC
None of these

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Electrical Machines
Resistance commutation is used generally in case of

 DC machines above 10 kW.
  fractional kW DC machines.
None of these
 DC machines bellow 5 kW.

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Electrical Machines
The crawling in the induction motor is caused by

 low voltage supply
 improper design of stator laminations
 harmonics developed in the motor
 high loads

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

  Increases.
 Decreases.
 Remains unchanged.
 None of above.

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