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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
Ward Leonard control provides speed control

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

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 imperfect contact.
 severe sparking.
 any of above.
 rough commutator surface.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 Kef2KfBm2.
 KefKf2Bm2.
 Kef2Kf2Bm.
  Kef2Kf2Bm2.

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

  compensating winding and commutating poles.
 shifting the brush axis from GNA to MNA.
 increasing field excitation.
 fixing the brush axis inline with the pole axis.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 0 V.
 20 V.
 60 V.

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