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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f3.
 f2.
 f1.5.

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Electrical Machines
A DC generator can be considered as

 prime mover.
 rectifier.
 power pump.
 rotating amplifier.

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Electrical Machines
Dynamic braking is employed to brake

 both 1 and 2
None of these
 reversing drive
 non reversing drive

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the number of turns in armature coil.
 increase the source frequency.
 increase the number of turns in field coil.
  increase the speed of shaft rotation.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 DC Shunt Motor
 AC single phase motor.
 Induction motor.
 Synchronous motor.

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ φ/f
 E ∝ φf
 E ∝ f/φ
 E ∝ 1/(φf)

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