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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 copper loss
 hysteresis loss
 both 1and 2

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 6 V
 somewhat less than 230 V
 somewhat more than 230 V
 230 V

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Differential compound.
 Cummulative compound.
  Shunt.
 Series.

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = sX2.
  R2 = s2X2.
  sR2 = X2.
  R2 = s2X2.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Doubled.
 Eight times.
 Four times.
 Remains same.

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 through inductive coupling
 in parallel
 either of these depending on the design of the motor
 in series

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