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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and high
 high and high
 high and low
 low and low

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v2.
 Blv.
 Bl2v.
 Blv2.

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Electrical Machines
Select the motor that should not be started on no load?

  Series motor.
 Compound motor.
 Shunt motor.
 Brushless DC motor.

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Electrical Machines
At stand still condition the value of slip is

 1
 infinite value
 0
 finite value

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 2 mg of KOH / gm.
 0.5 mg of KOH / gm.
  1 mg of KOH / gm.
  0.3 mg of KOH / gm.

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Electrical Machines
which of the following type of brush and their application is/are correct

All of these
 carbon brush → normal ratings
 copper graphite → low voltage high current density
 electro graphite → large ratings

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