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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 power.
 current.
 speed.
 torque.

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Electrical Machines
From no load to full load the slip will

None of these
 not change.
 slightly increase.
 slightly decrease.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

  Leading power factor.
 Unity power factor.
 Zero power factor.
 Lagging power factor.

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

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

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Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
  insulating.
 cooling.
 lubrication.

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Electrical Machines
A series motor is efficiently suitable for

 constant speed operation.
  high starting torque operation.
 low starting torque operation.
 none of these.

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