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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  mild steel.
  cast iron.
  aluminium.
  stainless steel.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Any of above.
 Shunt field resistance control.
 Armature resistance control.
 Armature voltage control.

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 leading.
  lagging.
 zero.
 unity.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 234 V
 474 V
 6 V
 240 V

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
For high current and low current rating which winding is employed to DC machine?

 Lap winding
 Both lap and wave winding
 Wave winding
 None of above

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