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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P.
  Z.
  P and Z.
  none of these.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  less than one.
  approx to one.
  very low
  greater than one.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 1200 A.
  3600 A.
 600 A.
 2400 A.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Open fuse or circuit breaker.
 Produce sparking at brushes.
  Develop excessive speed and damage itself.
 Draw too much current.

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 any of the above
 full load
 no load
 half load

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Electrical Machines
Dynamic braking is very effective for

 series motors.
 separately excited motors.
 shunt motors.
 differential compound motors.

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