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Electrical Machines

Electrical Machines
DC machine windings are

None of these
 short pitched
 full pitched
 either of these

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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

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

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

None of these
  Transistor shunt regulator.
  Transistor series regulator.
  Zener diode shunt regulator.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 Ia
 I/Ia2
 1/Ia
 Ia2

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 shifting the brush axis from GNA to MNA.
 increasing field excitation.
 fixing the brush axis inline with the pole axis.
  compensating winding and commutating poles.

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  asynchronous motor.
  asynchronous generator.
  synchronous generator.
  synchronous motor.

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MORE MCQ ON Electrical Machines

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