Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 20 V
 40 V
 50 V
 zero

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Electrical Machines
An inverted V curve of synchronous motor shows variation of

  power factor and DC excitation at constant load.
 power factor and supply voltage during hunting.
 supply voltage and excitation current at constant load.
 supply voltage and field current at constant excitation.

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Electrical Machines
The compensating winding in a DC machine

  is located on pole shoes for avoiding the flashover at the commutator.
  is located on pole shoes to avoid the sparking at the brushes.
 is located on commutating poles for improving commutation.
 is located in armature slots for compensation of the armature reaction.

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