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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Magnetic loss
 Copper loss
 Eddy current loss
 Hysteresis loss

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 2.2 Ω
 1.9 Ω
 6 Ω
 5.7 Ω

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

 GNA
 either GNA or MNA
None of these
 MNA

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Electrical Machines
A 3 stack stepper motor has 12 teeth on stator as well as on rotor. Determine the step size when each stack excited?

 45°.
 24°.
 30°.
  10°.

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage and frequency
 supply voltage and load
 supply voltage, frequency and load
 supply voltage

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Electrical Machines
Crawling in an induction motor is due to

  time harmonics in supply.
  space harmonics produced by winding currents.
  slip ring rotor.
  insufficient starting torque.

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