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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and high
 high and low
 low and low
 low and high

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  low horse power motor.
  high torque motor.
  single phase induction motor.
  high speed motor.

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer voltage
 direct current
 high frequency supply
 rated transformer current

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

 5 %.
  30 %.
  2.67 %.
 1.5 %.

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

 20 Hz.
  30 Hz.
  Can be determined.
 35 Hz.

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  less heating of the rotor.
  negative sequence current.
  all of these.

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MORE MCQ ON Electrical Machines

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