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

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

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Electrical Machines
The residual magnetism of a self-excited dc generator is lost. To build up its emf again

 the field winding connection must be reversed
 field winding must be excited by low voltage dc supply
 the armature connection must be reversed
 the field winding must be replaced

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