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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
3rd harmonics are eliminated in induction motor by using

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

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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.
 8 Ω.
  4 Ω.
 10 Ω.

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Electrical Machines
Eddy current loss will depends on

 Flux density
All of these
 Frequency
 Thickness

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Proportional to the armature current.
 Proportional to the square of armature current.
 Inversely proportional to the armature current.
 None of above.

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Electrical Machines
Demagnetization effects which of the following?

 both B and C
 reduces the terminal voltage
 reduction in main field flux
 commutation

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MORE MCQ ON Electrical Machines

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