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Electrical Machines

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

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

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Armature voltage control.
 Armature resistance control.
 Field control.
 Field diverter control.

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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?

 41%
 10%
 11%
 21%

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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 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 1.9 ohms.
 5.7 ohms.
 2.2 ohms.
 6 ohms.

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Electrical Machines
Which machine is used for battery charging?

 None of these.
 DC shunt generator.
 DC series generator.
 Compounded DC generator.

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

 Synchronous speed.
 Shaft torque.
  Core loss component.
 Rotor speed.

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MORE MCQ ON Electrical Machines

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