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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 cross magnetization
 demagnetization
 magnetization

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 AC single phase motor.
 DC Shunt Motor
 Synchronous motor.
 Induction motor.

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 2 V
 4 V
 0 V

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 None of the options.
 Compound.
 Parallel.
  Series.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  s2.
  sf / 2.
  f / s.
  sf.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very high speed.
 run at very low speed.
 burn.
 start haunting.

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MORE MCQ ON Electrical Machines

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