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Electrical Machines

Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 4%
 25%
 2%
 5%

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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
In DC generators brushes are used for

 convert ac armature current in to dc
 collecting of voltage
 collecting of current without any sparkings
 reduce eddy current loss

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Low.
  High.
  Equal to 1.
  Same as full load.

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Electrical Machines
What are slot wedges in a DC machine made of?

 Cast iron.
 Fibre.
 Silicon steel.
 Mild steel.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 zero power factor and slip tests.
 open circuit and zero power factor tests.
 short circuit and slip tests.
 open circuit and short circuit tests.

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