Electrical Machines
A series motor is efficiently suitable for

 constant speed operation.
 low starting torque operation.
 none of these.
  high starting torque operation.

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Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

 dc machines are comparatively low rating machines.
 it reduces field structure iron losses
 commutator action is not possible otherwise
 it gives more uniform air-gap flux distribution

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

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

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