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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  cast iron.
  aluminium.
  mild steel.
  stainless steel.

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Electrical Machines
For larger units high torque it is preferred to use

 Universal motor.
 DC shunt motor.
 Slip induction motor.
 Partial motor.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 all of above.
 poor overall efficiency.
 high initial cost.
 high maintenance cost.

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant current control
 constant torque control
 constant voltage control
 constant power control

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

 equal to core loss.
 less than core loss.
 zero.
  more than core loss.

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Electrical Machines
A 3 - Φ slip ring motor has

  wound rotor.
  short-circuited rotor.
  any of the above.
  double cage rotor.

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MORE MCQ ON Electrical Machines

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