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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

 cooling.
 lubrication.
  insulating.
  both cooling and insulation.

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Electrical Machines
Lamination of core are generally made of

 stainless steel.
 silicon steel.
 cast iron.
 carbon.

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Nothing will happen.
  Fail to start.
  Will results in open circuit.
  Will results in short circuit.

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 3.76%.
 2.57 %.
 2.56 %.
 4.76%.

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Electrical Machines
The principle of dynamically induced emf is utilized in

 choke.
 generator.
 thermocouple.
 transformer.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 remains constant.
 decreases with increase in the load torque.
 decreases with decrease in the load torque.
 increases with increase in the load torque.

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MORE MCQ ON Electrical Machines

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