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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

 -0.08
 -1.92
 1.92
 0.08

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  mechanical losses.
  hysteresis losses.
  eddy current losses.
  ohmic losses.

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at normal speed.
 run at lower speed.
 burn.
 not run.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Same in both induction motors.
 Squirrel cage induction motor.
None of these
 Slip ring induction motor.

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

None of these
 AC.
 DC.
 both of above.

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

 graphite brushes.
  commutator with large number of segments.
  carbon brushes.
  equalizer rings.

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