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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
 lubrication.
  insulating.
 cooling.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 full wave controlled
 half wave controlled
 full wave
 half wave

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to half of applied voltage.
 back emf is equal to twice of applied voltage.
 none of above.
 back emf is equal to applied voltage.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 proportionate to MVA rating of transformers.
 inversely proportional to MVA rating of transformers.
 such that actual impedance of all transformers would be same.
  same.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 4*ωm
 ωe = 2*ωm
 ωe = 1/2*ωm
 ωe = ωm

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Electrical Machines
Capacitor in split phase induction motor is used to

 improve the power factor.
 reduce the harmonics.
 start the motor.
 improve the starting torque.

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