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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

  0.573.
 0.512.
 0.443.
 0.649.

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Electrical Machines
In double cage induction motor, the inner cage offers

  high resistance and high reactance.
  high resistance and low reactance.
  low resistance and low reactance.
  low resistance and high reactance.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 load test
None of these
 OC and SC tests
 back to back test

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Electrical Machines
Which type of motors are preferred in lifts?

 DC shunt motors.
None of these
 DC compound motors.
 DC series motors.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 40 volts.
 20 volts.
 10 volts.
 30 volts.

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 motor will not run.
 it will run in same direction.
 it will run in same direction by slowly.
 it will run in opposite direction.

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