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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 sine wave.
  pulsed wave.
 square wave.
 triangular wave.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Operating speed.
 Starting torque.
 Starting torque, operating speed, full load current.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole winding
 armature winding
 field winding
 interpole and compensating windings together

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 25 Hz
 60 Hz
 50 Hz
 40 HZ

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Electrical Machines
Poles of DC machine are often laminated to

 dissipate more heat.
 reduce iron weight.
 reduce armature reaction.
 reduce pulsation loss.

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Electrical Machines
The constant losses in transformer is/are

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

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MORE MCQ ON Electrical Machines

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