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Electrical Machines

Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 100 Hz.
 25 Hz.
 Zero Hz.
 50 Hz.

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

 less than core loss.
 equal to core loss.
  more than core loss.
 zero.

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 cumulative compound.
 shunt.
 series.
 differential compound.

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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.
 Armature current.
 None of above.
 Line current.

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Electrical Machines
Which of the following motors is/are widely used?

 squirrel cage induction motor
None of these
 either of these
 slip ring induction motor

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Electrical Machines
Regenerative braking is possible in

 DC shunt motor with armature resistance control.
 DC series motor.
  DC shunt motor with field weakening control.
 DC compound motor.

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