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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 S.Ns
 Zero
 Ns

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 hysteresis loss.
 copper loss.
 vibrations.
 eddy electric current loss.

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 Fractional horse power high speed motor.
 Fractional horse power slow speed motor.
  Hermetically sealed motor of refrigerator.
 50 MW generator in a power plant.

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Electrical Machines
Series booster is a

 separately excited DC generator.
 shunt wound DC generator.
 permanent magnet DC generator.
  series wound DC generator.

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 3.5+j5.8 ohms
 8+j13 ohms
 53+j85 ohms
 3.05+j5.08 ohms

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

 run at lower speed.
 run at normal speed.
 burn.
 not run.

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MORE MCQ ON Electrical Machines

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