Electrical Machines
Which of the following statements is/are correct ?

 Compensating winding will act under the pole.
 Both A and B.
 Inter pole winding will act in interpolar region.
None of these

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Electrical Machines
A dc shunt generator, when driven without any excitation, showed an open circuit voltage of 12 V. When the field winding was excited, the voltage dropped to zero. It happened because

 there was a break in the armature circuit
 field resistance was higher than critical resistance
 there was no residual magnetism in the field circuit
 field winding was wrongly connected

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Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

 Ph will decrease but Pe will remain same
 Pe will increase but Ph will decrease
 Ph will increase but Pe will decrease
 both hysteresis loss(Ph) and eddy current loss(Pe) will increase

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