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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 run at lower speed.
 run at normal speed.
 not run.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 Separately excited DC motor.
 DC Shunt motor.
 DC series motor.
 DC compound motor.

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 not possible
 230 V
 some what more than 230 V
 some what less than 230 V

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and underecited
 lightly loaded and over excited
 heavily loaded and over excited
 heavily loaded and underexcited

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction.
 it will run in opposite direction.
 motor will not run.
 it will run in same direction by slowly.

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Electrical Machines
Which motor cannot be started on no load?

 shunt motors
 series motors
 both B and C
 cumulative compound motors

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MORE MCQ ON Electrical Machines

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