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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 speed
 armature current (I)
 flux (φ)
 both A and B

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 increased.
 kept constant to certain value.
  remains unchanged.
 decreased.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  DC series motor.
  Single phase induction motor.
  Synchronous motor.
  AC slip ring motor.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

  induction generator.
 synchronous motor.
 induction motor.
 synchronous generator.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 220 V.
  222 V.
 230 V.
 225 V.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 800 V.
 200 V.
 100 V.
 400 V.

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