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Electrical Machines

Electrical Machines
Slip exists in

  induction motor.
  synchronous motor.
  in both machines.
  none of above.

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Electrical Machines
The induction motor shaft is made of

  mild steel.
  aluminium.
  stainless steel.
  cast iron.

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Electrical Machines
The output voltage of a DC generator is

 E = V + Ra.
 E = V – IaRa.
  E = V + IaRa.
 E = V + Ia.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high speed.
  residual flux.
  magnetic inertia.
  high field resistance.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T is independent of P.
 T ∝ √P.
 T2 ∝ P3.
 T ∝ P.

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Electrical Machines
DC generator will not build up voltage

 due to wrong direction of rotation.
 any one of above.
 if field resistance is more than critical resistance.
  if it has lost residual magnetism.

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MORE MCQ ON Electrical Machines

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