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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  less maintenance.
  simple in construction.
  all of below.
  less cost.

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

  In series with the armature winding.
 As a separate unit.
 In parallel with the field winding.
 In parallel with the armature winding.

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

 0.2 lag
 0.2 lead
 unity
 0.9 lag

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 10%
 increased by 10%
 reduced by 20%
 increased by 20%

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Electrical Machines
A DC compound motor has

 both shunt and series field winding.
 tertiary winding.
 only series field winding.
 only shunt field winding.

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Electrical Machines
Rotor resistance speed control is used in

 slip ring induction motor.
 dc shunt motor.
 synchronous motor.
 squirrel cage induction motor.

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