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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f1.5.
 f2.
 f3.
  f.

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Electrical Machines
What is the effect of armature reaction ?

 None of the options.
  Both option B and C.
 Armature flux distorts the main field flux.
 Armature flux weakens the main field flux.

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Electrical Machines
The inertia constant H of a synchronous condenser is

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

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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

 59.2%.
 48.0%.
 88.8%.
 57.1%.

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 increase
 decrease
None of these
 either increase or decrease

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Universal motor.
  Reluctance motor.
  Slip ring induction motor.

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