Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Field flux.
 All of these.
 Applied voltage.
 Armature current.

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

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