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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 1 Hz
 50 Hz
 5 Hz

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Electrical Machines
In a DC Motor 3 point starter is used to

 limit the starting current to a safer value.
 all of above.
 provide overload protection.
 provide protection against Low-Voltage.

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  run normally.
  get over heated.
  not run.
  make noise.

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To absorb the mechanical shocks produced during running condition.
  To convert alternating supply current to direct current.
  None of these.
  To increase the flux cutting by the rotor.

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1 and 3
 1, 2 and 3
 2 and 3
 1 and 2

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Electrical Machines
What is the full form of MNP?

  Magnetic neutral plane.
  Magnetic field neutral pole.
  Magnetic neutral pole.
  Magnetic field neutral plane.

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MORE MCQ ON Electrical Machines

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