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Electrical Machines

Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 negative.
  zero.
 low.
 positive.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to twice of applied voltage.
 none of above.
 back emf is equal to applied voltage.
 back emf is equal to half of applied voltage.

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

  2 Hz.
 50 Hz.
 10 Hz.
  3 Hz.

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Electrical Machines
The slot edges in a DC machine are made of

 Cast iron.
 Silicon steel.
  Fibre.
 Mild steel.

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Electrical Machines
The condition for maximum running torque is

 unity
 0.5 lagging
 0.707 lagging
 R = S.X
 zero

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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 or star according to need.
  delta.
  star.

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