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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

 10 %.
  2.5 %.
  20 %.
  15 %.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero, 950 rpm.
 zero , - 50 rpm.
 1000 rpm, 950 rpm.
 1000 rpm, - 50 rpm.

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Electrical Machines
The stator frame in an induction motor is used to

  provide return path for the flux.
  protect the whole machine.
  hold armature stamping in position.
  ventilate the armature.

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.66 Ω.
 0.78 Ω.
  0.24 Ω.
 0.45 Ω.

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Electrical Machines
Which of the following motors has negative speed regulation?

 Shunt motors.
 Both B and C.
 Differential compound motors.
 Series motors.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

 1.5 %.
 4 %.
  zero.
  less than 1 %.

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