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Electrical Machines

Electrical Machines
Slip exists in

  in both machines.
  none of above.
  synchronous motor.
  induction motor.

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Electrical Machines
The emf induced in the dc generator armature winding is

None of these
 AC
 DC
 AC and DC

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

 T ∝ 1/V
 T ∝ 1/V²
 T ∝ V
 T∝ V²

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux distorts the main field flux.
 None of the options.
 Armature flux weakens the main field flux.
  Both option B and C.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

All of these
 RBY
 BRY
 BYR

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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

 2.56 %.
 3.76%.
 4.76%.
 2.57 %.

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