Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

 differentially compounded.
  separately excited.
  shunt connected.
  cumulatively compounded.

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

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