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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 Ns
 Zero
 S.Ns

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 230 V.
 460 V.
 115 V.
 200 V.

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Electrical Machines
Diverters are used only in

 either of these
 series motors
None of these
 shunt motors

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 1, 2, 3 and 4
 1, 2 and 3
 3 only
 1, 3

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Electrical Machines
Induction motors have the advantage of

  less cost.
  all of below.
  less maintenance.
  simple in construction.

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 not start automatically.
 develop very low starting torque.
 start automatically without trouble.
 get damaged.

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