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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Coupling mounted on the shaft.
 Field.
 Motor frame.
 Armature.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Heavy sparking at brushes.
 None of these.
 Both of above.
 Heavy sparking at the first stud of starting resistance steps.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 2 mg of KOH / gm.
  1 mg of KOH / gm.
 0.5 mg of KOH / gm.
  0.3 mg of KOH / gm.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  no resistance is connected.
  series.
  any one of the connection.
  parallel.

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Electrical Machines
In shaded pole induction motors, the flux moves from ------------- region to ----------------- region respectively?

 shaded, shaded
 shaded, unshaded
 unshaded, unshaded
 unshaded, shaded

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Electrical Machines
Hysteresis loss is proportional to

  f.
 f2.
 f3.
 f1.5.

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MORE MCQ ON Electrical Machines

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