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

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

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Electrical Machines
An ideal synchronous motor has no starting torque because

 rotor winding is highly reactive.
  relative velocity between stator and rotor mmf’s is not zero.
 rotor is made up of salient poles.
 relative velocity between the stator and rotor mmf’s is zero.

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