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Electrical Machines

Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Yoke.
 Armature.
  Commutator.
 Brush.

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 100 V.
 399 V.
 50 V.
  230.2 V.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 trapezoidal.
  triangular.
 rectangular.
 sinusoidal.

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 44 A.
  40 A.
 440 A.
 400 A.

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Electrical Machines
The power developed by salient pole synchronous machine is/are

None of these
 both 1 and 2
 power due to saliency or reluctance only
 excitation power only

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 2, 3, 4
 1, 2, 5
 2, 3, 4
 1, 3, 5

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