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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f2.
 f3.
 f1.5.

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Electrical Machines
DC shunt motors are suitable for

 Centrifugal pumps
 Blowers and fans.
 Lathes.
  All of this.

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Electrical Machines
Which of the following relation is correct?

 Xd > Xq.
None of these
 Xd < Xq.
 Xd = Xq.

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1080
 1200
 1203
 1000

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 88.8%.
 57.1%.
 48.0%.
 59.2%.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of hydro generator.
 equal to that of the effective length of the line.
 greater than that of turbo alternator.
  none of these.

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