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Electrical Machines

Electrical Machines
Eb/V ratio of a DC motor is an indication of

  Effiency.
 Starting torque.
 Speed regulation.
 Running Torque.

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

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 to reduce the insulation of materials.
 to provide large flux.
 as it carries large load current.
 in order to reduce eddy current to provide large flux.

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Electrical Machines
Which of the following motors has low ratings only?

 Capacitor start
 Capacitor run
 Resistance split phase
 Shaded pole

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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 remain the same
 will become lagging

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Electrical Machines
In an auto-transformer, power is transferred through

 conduction process only.
 both A and B.
None of these
 induction process only.

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MORE MCQ ON Electrical Machines

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