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Electrical Machines

Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

  4 / 5.
 2 / 3.
 6 / 7.
 5 / 6.

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Electrical Machines
Which of the following statement is correct, if short circuit ratio is high?

 High voltage regulation
 Low short circuit current
 Good voltage regulation
None of these

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer current
 high frequency supply
 rated transformer voltage
 direct current

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 four.
 three.
 two.
 six.

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Electrical Machines
Which type of motors are used for lathes?

 Synchronous motor.
 DC shunt motors.
 Cage induction motor.
 Either A or B.

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Electrical Machines
The constant losses in transformer is/are

 copper loss.
 eddy current loss.
 hysteresis loss.
 both 2 and 3.

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