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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

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

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 540 rpm.
  470 rpm.
  240 rpm.
 450 rpm.

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Electrical Machines
which of the following type of brush and their application is/are correct

All of these
 carbon brush → normal ratings
 electro graphite → large ratings
 copper graphite → low voltage high current density

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

  Paraffin based insulating oil.
 Olefin based insulating oil.
 Naphtha based insulating oil.
 Aromatics based insulating oil.

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Electrical Machines
Ward Leonard control provides speed control

 in both direction.
 in one direction only.
 below rated speed.
 above rated speed.

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

  demagnetizing.
 ineffective.
 magnetizing.
 cross – magnetizing.

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