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Electrical Machines

Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 not changed
 decrease
 increase
None of these

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  harmonics.
  resonance.
  cogging.
  crawling.

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Electrical Machines
What are the starters used for starting of cage motors?

  All of these.
 Auto transformer starter.
 DOL starter.
 Star-delta starter.

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Electrical Machines
A DC generator without commutator is a

 DC motor
 AC generator
 DC generator
 induction motor

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 0.98
 0.04, 1.96
 0.02, 1.98
 0.04, 0.96

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KW.
 Power drawn in KVA.
 Gross power.
  Output power at the shaft.

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MORE MCQ ON Electrical Machines

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