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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 series motors
 shunt motors
 cumulative compound motors
 both B and C

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 direction of flux.
 direction of induced emf.
 opposite to the direction of motion of the conductor.
 direction of motion of the conductor.

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Electrical Machines
Which of these types of motor is self starting?

  None of these.
  Poly-phase induction motor.
  Single phase induction motor.
  Poly-phase synchronous machine.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  equal to number of rotor slots.
  an integral multiple of number of rotor slots.
  unequal to number of rotor slots and skewed in shape.
  either (B) or (C).

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of turbo alternator.
  none of these.
 greater than that of hydro generator.
 equal to that of the effective length of the line.

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Electrical Machines
DC machine is a

 both are correct.
 conduction machine.
 none of above are correct.
 convection machine.

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MORE MCQ ON Electrical Machines

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