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Electrical Machines

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

  f / s.
  s2.
  sf.
  sf / 2.

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of field flux on the armature flux.
None of these
  Effect of armature flux on the main field flux.
 Effect of armature flux on the load.

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

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.6 kW, 12 kW.
  6.3 kW, 9.3 kW.
 9.3 kW, 9.3 kW.
 5.7 kW, 8.7 kW.

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Electrical Machines
In DC generator, lap winding is used in

 where greater load is connected.
  high current and low voltage applications.
 high voltage and low current applications.
 where constant speed is required.

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Electrical Machines
Which of the following is/are not a self starting motor?

None of these
 1-phase induction motor
 both 1 and 2
 3-phase induction motor

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