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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

 low resistivity.
  low viscosity.
 high viscosity.
 low BDV.

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Electrical Machines
The torque developed in IM is nearly proportional to

  V2.
 1 / V2.
  V.
  1 / V.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

 0 .001 %.
None of these
 3 %.
  3.33 %.

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

 150 Ω.
 225 Ω.
 145 Ω.
  375 Ω.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 efficiency.
 starting torque.
 running torque.
 speed regulation.

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 increase.
None of these
 remains constant.
 decrease.

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MORE MCQ ON Electrical Machines

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