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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
 remains same.
None of these
 decreases.

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Electrical Machines
The functions of inter poles are

 both 1 and 2
 reduce cross magnetization effect and improve commutation
None of these
 nullify reactance voltage and improve the commutation.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  transformer with short-circuited secondary.
  capacitor run IM.
  synchronous motor.
  repulsion motor type starting.

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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is

  8.9%.
 14%.
 7%.
 0%.

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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

 2.7 mWb.
 1.4 mWb.
  1.2 mWb.
 3.5 mWb.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  1/Ia.
  √Ia.
  Ia.
  Ia2.

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MORE MCQ ON Electrical Machines

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