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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

  35 ppm.
 25 ppm.
 20 ppm.
 45 ppm.

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Electrical Machines
Which of the DC Motor use flywheel?

 Differently compared motor.
 Cumulatively compound motor.
 Series motor.
 Shunt motor.

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 115 V.
 200 V.
 460 V.
 230 V.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of input to output voltage.
  ratio of starting to running current.
  ratio of starting to running torque.
  efficiency.

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

  hysteresis loss.
 ohmic loss.
 eddy current loss.
 both eddy current and hysteresis loss.

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

 18.25%.
 15.30%.
 14.28%.
  16.67%.

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MORE MCQ ON Electrical Machines

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