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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 30 W.
 28 W.
 25 W.
 36 W.

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 271.7 V.
 238.2 V.
 240 V.
  256.4 V.

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  sinusoidal.
 triangular.
  pulsating.
  flat topped.

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 slip rings.
 solid connection.
 none of above.
 commutator.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 fixing the brush axis inline with the pole axis.
 shifting the brush axis from GNA to MNA.
 increasing field excitation.
  compensating winding and commutating poles.

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