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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 95%
 96%
 92%
 94%

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

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

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Electrical Machines
Commutator in DC generator is used for

 reduce losses
 increase efficiency
 convert AC armature current in to DC
 collecting of current

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Electrical Machines
Reactive power generated or delivered significantly depends on

 excitation.
 frequency.
 both 1 and 2.
 load angle.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  get damaged.
  continue running in the same direction as before.
  not run.
  run in a direction opposite to previous one.

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  silicon steel.
  stainless steel.
  aluminium.

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