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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 triangular wave.
  pulsed wave.
 sine wave.
 square wave.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

 1.5 %.
  zero.
  less than 1 %.
 4 %.

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Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  very small, say about 2 or 3 V.
 about 100 V.
  zero.
  250 V.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 50Hz
 2HZ
 2.5Hz

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 armature winding
 starters
 field winding
 commutator

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