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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 50 Hz
 25 Hz
 40 HZ
 60 Hz

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become leading
None of these
 will become lagging
 will remain the same

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

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

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 constant loss
None of these
 variable loss
 both A and B

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

  Bush bearings.
  Cast iron bearings.
  Ball bearings.
None of these

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

  DC series motor.
 DC shunt motor.
 DC shunt generator.
  DC series generator.

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