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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 10°
 30°
 60°
 45°

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Electrical Machines
Example of double excited machine is

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

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 3000 rpm
 1500 rpm
 375 rpm
 75 rpm

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Electrical Machines
Capacitor in split phase induction motor is used to

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

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Electrical Machines
Transformer oil is used as

 a coolant.
 both A and B.
 an insulator.
 inert medium.

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 series.
 shunt.
 differential compound.
 cumulative compound.

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MORE MCQ ON Electrical Machines

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