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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  mild steel.
  cast iron.
  stainless steel.
  aluminium.

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Electrical Machines
The torque developed in IM is nearly proportional to

 1 / V2.
  V.
  1 / V.
  V2.

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Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (V2 - E2) / E2
 (E2 - V2) / V2
 (V2 - E2) / V2

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3000 rpm.
  3600 rpm.
  4000 rpm.
  1500 rpm.

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Reluctance motors.
  Universal motors.
  Induction motors.
  Stepper motors.

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Electrical Machines
In case of IM the torque is

  inversely proportional to slip.
  directly proportional to slip.
  inversely proportional to √slip.
  directly proportional to slip2.

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MORE MCQ ON Electrical Machines

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