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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 3Fmax.
 Fmax.
 (1/2)Fmax.
  (3/2)Fmax.

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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

 Differently compounded.
 Series.
 Cummulative compound.
 Shunt.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.5.
  1.0.
  0.1.
  0.05.

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
  0.5 ohm.
 50 ohm.
 100 ohm.

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Electrical Machines
A DC series motor must started on no load because it would

 Fail to start without load.
 Not develop starting torque.
  Run at dangerously high speed.
 Draw more current without producing sufficient torque.

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Power factor and field current.
  Armature current and field current.
 Armature current and torque.
 Torque and field current.

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