Electrical Machines
Which of the following represents the rotating losses of machine?

 Hysteresis losses
 Eddy current losses
 All of the them
 Friction and windage losses

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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 field winding was wrongly connected
 field system lost residual magnetism
 field resistance was higher than critical resistance
 there was a break in the armature circuit

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