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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 250 - 500 W.
 200 - 250 W.
 10 - 20 W.
  50 - 150 W.

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 11%
 21%
 41%
 10%

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imax
 Vmax to Imin
 Vmin to Imax
 Vmin to Imin

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Electrical Machines
Which of the following DC Motor uses 4-point starter?

 DC shunt motor with armature resistance.
 DC compound motor.
 DC series motor.
 DC shunt motor with field weaking control.

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

  triangular.
 sinusoidal.
 trapezoidal.
 rectangular.

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Electrical Machines
Synchronous reactance of an alternator represents

 a reactance operating at synchronous speed
All of these
 field winding reactance
 armature reactance and leakage reactance

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