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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T∝ V²
 T ∝ 1/V²
 T ∝ V

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

All of these
 supply voltage control
 armature circuit resistance control
 field current control

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying supply voltage.
  Both (A) and (B).
  By varying number of poles.
  By varying the supply frequency.

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 2-S
 S
 1/S
 1-S

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 locking.
 plugging.
 crawling.
 cogging.

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Electrical Machines
Lamination of transformer core is made of

 wrought iron.
  cast iron.
  silicon steel.
 cast steel.

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