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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  stainless steel.
  aluminium.
  cast iron.
  mild steel.

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Electrical Machines
The heat transfer by convection in a transformer least depends on

 surface area.
 air velocity.
 temperature difference.
  color of the paint.

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Electrical Machines
In synchronous motor the torque is proportional to

 P²
 Power P
 1/P
 1/P²

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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?

 K × input power
None of these
 both A and B
 (1-K) × input power

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Electrical Machines
It is advisable to start a DC series motor with some load to

  Limit the speed.
 Limit the current.
 Avoid sparking.
 Limit the flux.

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Electrical Machines
Which type of motors are preferred in lifts?

 DC series motors.
None of these
 DC compound motors.
 DC shunt motors.

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MORE MCQ ON Electrical Machines

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