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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -1.92
 -0.08
 1.92
 0.08

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 rating of generators should be same.
 both A and B.
 polarities should be same.
 terminal voltage should be same.

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Electrical Machines
A DC generator without commutator is a

 AC generator
 induction motor
 DC generator
 DC motor

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 changing the field excitation.
 changing the load.
 varying the speed.
 varying the applied voltage.

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Electrical Machines
A single-winding single-phase motor has

  zero starting torque.
 starting torque equal to full-load torque.
 low starting torque.
 high starting torque.

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/3000.
 PN/60.
 PN/120.
 PN/2.

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