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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.05.
  1.0.
  0.5.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  400 Amp.
  0.5 Amp.
 800 Amp.
 320 Amp.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  eddy current losses.
  mechanical losses.
  hysteresis losses.
  ohmic losses.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  crossmagnetising.
  magnetising.
 demagnetising.
  none of above.

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Electrical Machines
The torque developed in IM is nearly proportional to

 1 / V2.
  V2.
  V.
  1 / V.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 50 KVA
 100 KVA
 83.33 KVA
 123.3 KVA

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