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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Eddy current loss
 Copper loss
 Magnetic loss

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Electrical Machines
Open circuit test on transformer gives

 hysteresis loss
 both 1and 2
 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
 1, 2, 3 and 4
 3 only
 1, 2 and 3

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 between zero and infinity.
 remain unchanged.
 approach zero.
 aprroach infinity.

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 both increase
 both decrease
 increase and decrease respectively
 decrease and increase respectively

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

  1 - 2 µF.
 5 - 10 F.
 0.1 µF.
  2 - 3 µF.

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MORE MCQ ON Electrical Machines

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