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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 460 V.
 230 V.
 200 V.
 115 V.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high speed.
  high field resistance.
  residual flux.
  magnetic inertia.

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and armature current
 no load voltage and field current
 short circuit current and field current
 short circuit current and armature current

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 1000W
 3000W
 100W
 500W

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Electrical Machines
In synchronous generator V curve is drawn between

 either of these.
 field current on X-axis and power factor on Y-axis.
 field current on Y-axis and armature current on X-axis.
 field current on X-axis and armature current on Y-axis.

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Electrical Machines
_____________ types of induction motor are widely used.

  Three phase IM.
  Single phase IM.
  Slip ring IM.
  Squirrel cage IM.

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MORE MCQ ON Electrical Machines

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