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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

  50 - 150 W.
 10 - 20 W.
 250 - 500 W.
 200 - 250 W.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.125 p.u
  0.75 p.u
  0.25 p.u
  0.5 p.u

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 1 : 1.
 N1 : N2.
 none.
 N12 : N22.

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Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of cogging.
 increase starting torque.
 reduce chance of crawling.
  reduce magnetizing current.

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 1Ω.
 0.25Ω.
  0.23Ω.
 0.5Ω.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf.
  sf / 2.
  s2.
  f / s.

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MORE MCQ ON Electrical Machines

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