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

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

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Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

  get heated and damaged.
  rotate in the same direction as before maintenance.
  not start at all.
  rotate in direction opposite to that before maintenance.

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