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Electrical Machines

Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f
 f2
 V2
 V

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

  In series with the armature winding.
 In parallel with the field winding.
 In parallel with the armature winding.
 As a separate unit.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.08 pu.
  0.02 pu.
 0.16 pu.
 0.01 pu.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Torque and speed both increase.
 Both torque and speed decrease.
  Torque increase and speed decrease.
 Torque decrease and speed increases.

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 2.5Hz
 1.5Hz
 48.5Hz
 51.5Hz

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Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Star - delta
 Delta - star
 Delta - delta

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MORE MCQ ON Electrical Machines

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