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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 19%
 40%
 5%
 10%

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Electrical Machines
The speed regulation of a DC motor is given as

 NnL − NfL.
 (NnL − NfL)/NfL.
 (NfL − NnL)/NnL.
 NnL/NfL.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  0.5 Amp.
 320 Amp.
 800 Amp.
  400 Amp.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 cummulative compound motor.
 shunt motor.
  series motor.
 AC synchronous motor.

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
 100 ohm.
 50 ohm.
  0.5 ohm.

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

 160.
  150.
 170.
 180.

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