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Electrical Machines

Electrical Machines
Example of double excited machine is

 DC Shunt Motor
None of these
 Both are correct.
 Synchronous motor.

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Electrical Machines
The use of higher flux density in the transformer design

 reduces the weigh per KVA
None of these
 increases the weigh per KVA
 has no relation with the weight of transformer

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 0.5 at 90°C.
  1 at 90°C.
 3 at 90°C.
 2 at 90°C.

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
None of these
 increase
 decrease

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 20°
 18°
 30°
 60°

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Electrical Machines
Capacitor in split phase induction motor is used to

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

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MORE MCQ ON Electrical Machines

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