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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imax
 Vmin to Imin
 Vmin to Imax
 Vmax to Imin

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing of frequency.
  increasing number of poles.
  speed can not be increased.
  decreasing of frequency.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  transposing any two leads from supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.

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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 following DC generator will be in a position to build up without any residual magnetism in the field?

  Separately excited.
  Series.
 Shunt.
  Compound.

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Electrical Machines
Synchronising power of a synchronous motor varies

All of these
 directly as synchronous reactances Xs
 directly as Xs2
 inversely as 1/Xs

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MORE MCQ ON Electrical Machines

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