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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 more.
 between 50% and 90%.
 same.

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

  4 Ω.
  2 Ω.
 8 Ω.
 10 Ω.

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  It will rotates in reverse direction.
  Fail to start.
  Either short circuit or open circuit occurs.
  It will rotates in normal operation.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  500 to 720.
  1440 to 2880.
  720 to 920.

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 1 , 3, 5
 1, 4,5
 2, 3, 5
 2, 4, 5

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

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

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MORE MCQ ON Electrical Machines

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