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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V²
 supply voltage V
 1/V
 V²

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  increase the starting torque.
  reduce the chance of cogging.
  reduce the chance of crawling.
  reduce the magnetizing current.

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Electrical Machines
Which of the following motors has low ratings only?

 Shaded pole
 Capacitor start
 Resistance split phase
 Capacitor run

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Electrical Machines
For high current and low current rating which winding is employed to DC machine?

 Wave winding
 None of above
 Both lap and wave winding
 Lap winding

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 570 A.
 340 A.
 460 A.
 250 A.

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 1, 3
 3 only
 1, 2 and 3
 1, 2, 3 and 4

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