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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 2HZ
 50Hz
 2.5Hz

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Electrical Machines
The principle of dynamically induced emf is utilized in

 generator.
 thermocouple.
 transformer.
 choke.

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Electrical Machines
The application that need frequent starting and stopping is

  paper mills.
  lifts and hoists.
  jaw crushers.
  blowers.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Eddy current losses
 Copper losses
 Hysteresis losses
 Both 1 and 2

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve power factor.
  improve starting torque.
  reduce copper loss.
  improve efficiency.

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

  convection.
 radiation.
All of these
 conduction.

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MORE MCQ ON Electrical Machines

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