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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  aluminium.
  carbon.
  stainless steel.

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 None of above.
 The voltage across the terminals.
 The speed of motor.
 The torque required.

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 crawling.
 locking.
 cogging.
 plugging.

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

  (3/2)Fmax.
 Fmax.
 3Fmax.
 (1/2)Fmax.

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Electrical Machines
Synchronising power of a synchronous motor varies

 directly as Xs2
All of these
 directly as synchronous reactances Xs
 inversely as 1/Xs

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Electrical Machines
Exciting current of an induction motor is

  equal as power transformer.
  higher than power transformer.
  none of these.
  lesser than power transformer.

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