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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 copper loss
 eddy current loss
 both 1and 2
 hysteresis loss

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 5 - 10 F.
  1 - 2 µF.
  2 - 3 µF.
 0.1 µF.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 more than normal speed.
 zero.
 normal speed.
 less than normal speed.

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 increase by 200%
 reduced to half
 increase by 100%
 remain unaltered

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Electrical Machines
Hunting in a synchronous motor takes place

  motor is under loaded.
  when supply voltage fluctuates.
  when load varies.
  when power factor is unity.

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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Circle about the origin.
 Straight line parallel to the speed axis.
 Rectangular hyperbola
 Straight line through the origin.

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MORE MCQ ON Electrical Machines

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