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Electrical Machines

Electrical Machines
Which of the following is not a part of transformer?

 Tap changer.
 Conservator tank.
 Radiator.
  Commutator.

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 2 to 3 commutator segment.
 the width more than 3 commutator segment.
 less than the width of commutator segment.
 the width of the 1 to 2 commutator segment.

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

All of these
 Stator copper loss
 Stator core loss
 Rotational loss

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will become slow.
  It will run in opposite direction.
 motor will not run.
 It will run in same direction.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 3
 1/3
 1/√3
 √3

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  mechanical losses.
  ohmic losses.
  hysteresis losses.
  eddy current losses.

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