Electrical Machines
Commutators in DC machines have a role of which converts

 high voltage DC to low voltage DC.
 none of these.
 Both AC to DC and DC to AC.
 AC to DC.

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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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