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Electrical Machines

Electrical Machines
On what factors the speed of dc motor depends?

 All of these.
 Applied voltage.
 Armature current Ia.
 Field flux.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 36°
 18°
 72°
 30°

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

 Zero
 Nr
 Ns
 S.Ns

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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 4%
 5%
 2%
 25%

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 direct axis and interpolar axis
 quadrature axis and interpolar axis
 direct axis and indirect axis
 quadrature axis and direct axis

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Electrical Machines
Use of fractional pitch winding

  results in reduced leakage reactance.
  make it stiffer.
All of these
  results in reduced axial length of the machine.

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MORE MCQ ON Electrical Machines

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