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Electrical Machines

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

 sinδ
 sin2δ
 cos2δ
 cosδ

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 in reverse.
 to an AC source.
  to a DC source.
 to earth.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Synchronous motor.
  DC differential compound motor.
  Slip ring induction motor.
  Stepper motor.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 4 times.
 one fourth.
 half.
 double.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lead
 0.2 lag
 unity
 0.9 lag

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

 pulsating and unidirectional
None of these
 oscillating
 steady and unidirectional

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