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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.02
 0.04
 0.2
 0.4

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  60 Hz.
  25 Hz.
  16.67 Hz.
  50 Hz.

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Electrical Machines
A compound motor has

  both shunt and series field winding.
  only series field winding.
  only shunt field winding.
  tertiary winding.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 leading power factor
 lagging power factor
All of these
 unity power factor

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 Field current.
 Line current.
 None of above.
 Armature current.

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