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Electrical Machines

Electrical Machines
The constant losses in transformer is/are

 hysteresis loss.
 both 2 and 3.
 eddy current loss.
 copper loss.

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

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Electrical Machines
The frame of an induction motor is made of

  silicon steel.
  aluminium.
  stainless steel.
  closed grained cast iron.

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Electrical Machines
In DC machine torque is proportional to which of the following?

 both A and B
 flux(φ)
 armature current(Ia)
None of these

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 run at normal speed.
 run at lower speed.
 not run.

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 2 to 3 commutator segment.
 the width more than 3 commutator segment.
 less than the width of commutator segment.
 the width of the 1 to 2 commutator segment.

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