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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  2 - s.
 2 + s.
  s.
 1 - s.

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Electrical Machines
What is the full form of MNP?

  Magnetic neutral pole.
  Magnetic neutral plane.
  Magnetic field neutral plane.
  Magnetic field neutral pole.

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  none of these.
  reversed.
  modified.
  increased.

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 400 V.
 420 V.
 350 V.
 480 V.

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Electrical Machines
Secondary winding of an auto transformer is also called

  common winding.
 damping winding.
 tertiary winding.
 compensating winding.

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 Ia remains constant but ωm increase
 both decrese
 Ia increases and ωm decreses
 both armature current Ia and speed ωm increase

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