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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

  s2.
  sf.
  sf / 2.
  f / s.

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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.
  230.2 V.
 50 V.

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  Reluctance motor.
  AC slip ring IM.
  DC series motor.
  Capacitor type induction motors.

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Electrical Machines
The slip of an induction motor normally does not depend on

  core loss component.
  rotor speed.
  synchronous speed.
  shaft torque.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 synchronizing power co efficient.
  restoring torque.
 mechanical rotatory system.
 damping torque.

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

 44 A.
 400 A.
 40 A.
 440 A.

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