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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  high.
  zero.
  medium.
  low.

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Electrical Machines
Drop in speed from no load to full load is very high in

 Shunt motor with interpoles.
  Series motor without interpoles.
 Cummulative compound motor with interpoles.
 Series motor with interpoles.

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  shaded pole type.
  split phase.
  capacitor run.
  capacitor start.

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 magnetizing.
 ineffective.
  demagnetizing.
 cross – magnetizing.

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Electrical Machines
The rotor speed of an induction motor is given by

None of these
  Nr = 120f / p × (1-s).
  Ns = 120f /p × ( 1 - r).
  Ns = 120f / p × ( 1 - s ).

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Electrical Machines
Which of the following motor is used in grinders?

  Synchronous motor.
  Split phase IM.
  Capacitor start capacitor run IM.
  Capacitor start IM.

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