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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (E2 - V2) / V2
 (V2 - E2) / E2
 (V2 - E2) / V2

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 draw too much current.
 develop excessive speed and damage itself.
 open fuse or circuit breaker.
 produce sparking at brushes.

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Proportional to the square of armature current.
 Proportional to the armature current.
 None of above.
 Inversely proportional to the armature current.

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Electrical Machines
DC generator will not build up voltage

 due to wrong direction of rotation.
  if it has lost residual magnetism.
 if field resistance is more than critical resistance.
 any one of above.

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 2, 3, 5
 1, 4,5
 1 , 3, 5
 2, 4, 5

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Electrical Machines
Transformer action requires a

 increasing magnetic flux.
 alternating electric flux.
 alternating magnetic lux.
 constant magnetic flux.

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MORE MCQ ON Electrical Machines

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