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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 / 2.
  sf.

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Electrical Machines
In DC machine torque is proportional to which of the following?

 flux(φ)
 both A and B
None of these
 armature current(Ia)

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Electrical Machines
Flux density under leading pole tips in case of generator will

 either increase or decrease
 decrease
None of these
 increase

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Electrical Machines
During hunting of a synchronous motor

  damper bar develops torque.
  harmonic are developed in the armature circuit.
  negative phase sequence currents are generated.
  field excitation increases.

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant power control
 constant current control
 constant torque control
 constant voltage control

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

  2 - 3 µF.
 0.1 µF.
  1 - 2 µF.
 5 - 10 F.

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