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Electrical Machines

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

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

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will becomes four times.
  It will be halved.
 It will remain the same.
  It will be doubled.

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

  4 Ω.
 10 Ω.
  2 Ω.
 8 Ω.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = ωm
 ωe = 2/P*ωm
 ωe = P/2*ωm
 ωe = P*ωm

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Electrical Machines
Torque developed in the rotor is

 either of these
 inversely proportional to slip
 not dependent on the slip
 directly proportional to slip

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 Permanent magnets.
 None of the options.
 Both B and C.
  Electromagnets.

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