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Electric Circuits

Electric Circuits
Reactive power drawn by a pure resistor is

 maximum
 minimum
 0
None of these

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Electric Circuits
In a 3 - φ delta connection, two-wattmeter method is used to measure the power; if the two watt meters read 28.13 kW and 13.31 kW, the power factor of connection will be

 0.9.
 0.85.
 0.4.
 0.6.

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Electric Circuits
In parallel RC circuit total current is 5A and current through resistor is 3A. What is the current through capacitor?

 3A
 5A
 2A
 4A

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Electric Circuits
The capacitive reactance of an electric circuit is 50 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 50 Ohms.
 100 Ohms.
 25 Ohms.
 200 Ohms.

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Electric Circuits
Which of following is invariably seen in an electroplating plant?

  Rectifier.
  Barrel.
  Distilled water.
  Carbon brushes.

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Electric Circuits
A piece of copper and another piece of germanium are cooled from room temperature to 80K. The resistance of

 each of them decreases.
 each of them increases.
 copper increases and germanium decreases.
 copper decreases and germanium increases.

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MORE MCQ ON Electric Circuits

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