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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 flat-topped
 co- sinusoidal
 sinusoidal
 rectangular

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 zero.
 more than normal speed.
 less than normal speed.
 normal speed.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 rating of generators should be same.
 terminal voltage should be same.
 polarities should be same.
 both A and B.

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Remain unchanged
 None of above.
 Increases.
 Decreases.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Starting torque.
 Operating speed.
 Starting torque, operating speed, full load current.

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie in the inter polar gaps.
 there is no hard and fast rule for this.
 lie under south pole.
 lie under north pole.

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MORE MCQ ON Electrical Machines

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