Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

None of these
  delta.
  star.
  delta or star according to need.

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Electrical Machines
With the increase in speed of DC motor

 Both back emf as well as line current increase.
  Back emf increase but line current falls.
 Both back emf as well as line current fall.
 Back emf falls and line current increase.

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