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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 6.
 4.
  2.
  8.

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

 750.
 500.
 200.
  100.

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Electrical Machines
If a DC motor is connected across the AC supply it will

  Burn.
 Run at lower speed.
 Not run.
 Run at normal speed.

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

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

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Electrical Machines
Which of the following bearings and their uses are correct

 both A and B
 ball bearings → small machines
 neither 1 nor 2
 roller bearings → large machines

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  500 to 720.
  375 to 500.
  1440 to 2880.
  720 to 920.

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