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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 60°.
 90°.
 30°.
 120°.

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Electrical Machines
Which of the following bearings and their uses are correct

 ball bearings → small machines
 neither 1 nor 2
 both A and B
 roller bearings → large machines

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 remain unaltered.
 become execessively high.
 decrease.
 increase.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

 0.16 pu.
  0.08 pu.
 0.01 pu.
  0.02 pu.

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Electrical Machines
Belt conveyors offer _______________ starting torque.

  high.
  low.
  zero.
  medium.

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 in reverse.
  to a DC source.
 to an AC source.
 to earth.

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MORE MCQ ON Electrical Machines

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