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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 hysteresis loss
 both 1and 2
 eddy current loss
 copper loss

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Electrical Machines
Induction motors have the advantage of

  simple in construction.
  less maintenance.
  less cost.
  all of below.

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

 increase
 either increase or decrease
 decrease
None of these

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 0.98
 0.04, 1.96
 0.02, 1.98
 0.04, 0.96

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Electrical Machines
The constant losses in transformer is/are

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

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
  series motor.
 cummulative compound motor.
 AC synchronous motor.

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MORE MCQ ON Electrical Machines

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