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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 cosδ
 sinδ
 cos2δ

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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 remain the same
 will become lagging
 will become leading
None of these

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

  Stepper motor.
 Shaded pole motor.
 Reluctance motor.
 Hysteresis motor.

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the number of turns in armature coil.
 increase the source frequency.
  increase the speed of shaft rotation.
 increase the number of turns in field coil.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  frequency of waveform.
  number of turns in coil.
All of these
  flux per pole.

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 high efficiency.
 low starting torque.
  quick acceleration.
 reduced size.

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