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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

 2%
 25%
 4%
 5%

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to armature current.
  Constant.
 Proportional to the square of armature current.
 Inversely proportional to armature current.

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC series motor.
 Synchronous motor.
 DC Shunt motor.
 DC compound motor.

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Electrical Machines
Which of these types of motor is used in elevators?

 DC series motor.
 None of these.
 DC shunt motor.
 DC compound motor.

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve voltage level.
  Improve power factor.
  Improve current level.
  Improve power level.

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

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

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