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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 core.
 armature.
  magnetic field poles.
 none of these.

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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

  2 Ω.
  4 Ω.
 10 Ω.
 8 Ω.

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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.

 50 V.
 399 V.
  230.2 V.
 100 V.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 in order to reduce eddy current to provide large flux.
 as it carries large load current.
 to reduce the insulation of materials.
 to provide large flux.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  star connection.
  delta connection.
  zig - zag connection.
  V connection.

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