Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 more than 220 V
 6 V
 somewhat less than 220 V
 220 V

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

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

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Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is

 equal to φm, where φm is the maximum flux due to any phase
 1/2 times maximum value of flux due to any phase
 3/2 times maximum value of flux due to any phase
 3 times maximum value of flux due to any phase

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