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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

None of these
 DC compound motors.
 DC series motors.
 DC shunt motors.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 44 A.
 400 A.
 440 A.
 40 A.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 2/√5
 1/√5
 1/3
 1/√2

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Electrical Machines
During no load test, an induction motor draws power

  for copper loss and windage friction loss.
  for core loss and copper loss.
  only for the small copper loss.
  for core loss and windage and friction loss.

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  split phase.
  shaded pole type.
  capacitor start.
  capacitor run.

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Electrical Machines
The slip of an induction motor normally does not depend on

  core loss component.
  synchronous speed.
  shaft torque.
  rotor speed.

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