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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
 GNA
 either GNA or MNA
None of these

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.02
 0.04
 0.4
 0.2

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

  16.67%.
 14.28%.
 15.30%.
 18.25%.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  4000 rpm.
  3600 rpm.
  3000 rpm.
  1500 rpm.

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Electrical Machines
DC shunt motors are suitable for

 Centrifugal pumps
 Blowers and fans.
  All of this.
 Lathes.

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Electrical Machines
Synchronous condensers are used to

 improve starting torque
 reduce hunting
 improve the power factor
All of these

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