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Electrical Machines

Electrical Machines
On what factors the speed of dc motor depends?

 All of these.
 Applied voltage.
 Armature current Ia.
 Field flux.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 sinusoidal.
 trapezoidal.
 rectangular.
  triangular.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 comulatively compounded motor
 series motor
 permanent magnet motor
 differentially compounded motor

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Remains same.
 Four times.
 Eight times.
 Doubled.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 none of above
 shunt field
 armature circuit
 both A and B

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 59 / 3.
  slip X 69 / 3.
 1.
  slip X 50 / 3.

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