Electrical Machines
DC Shunt Motor has disadvantage(s) of

 constant speed.
 less expensive.
 not suitable for rapidly changing loads.
 none of above.

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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 field winding was wrongly connected
 field resistance was higher than critical resistance
 there was a break in the armature circuit
 field system lost residual magnetism

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