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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 hysteresis loss
 copper loss
 both 1and 2
 eddy current loss

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Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
 below rated speed
None of these
 above rated speed

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 Induction motor.
 Synchronous motor.
 DC Shunt Motor
 AC single phase motor.

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Electrical Machines
The starting resistance of DC motor is generally

 around 500 ohms.
 1000 ohms.
  Low.
 Infinitely large.

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Electrical Machines
What is the highest possible speed of turbo alternators?

 4000 rpm
 1500 rpm
 3000 rpm
 1000 rpm

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Electrical Machines
Under commutation results in

  no sparking.
  sparking the trailing edge of the brush.
  sparking at the middle of the brush.
  sparking at the leading edge of the brush.

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MORE MCQ ON Electrical Machines

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