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Electric Circuits

Electric Circuits
Which of the following quantities consists of SI unit as WATT ?

 Current
 Power
 Charge
 Force

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Electric Circuits
The inductive reactance of an electric circuit is 200 Ohms. The frequency of supply becomes doubled. What is the new capacitive reactance?

 200 Ohms.
 100 Ohms.
 400 Ohms.
 50 Ohms.

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Electric Circuits
Time constant is the time taken for response to rise -------of maximum value?

 90%
 100%
 68.3%
 63.2%

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Electric Circuits
Magnetic flux has the unit of

  Tesla
 Ampere turn
 Newton
 Weber

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Electric Circuits
When AC flows through a pure capacitance then the current

 leads the emf by - 90o.
 is in phase with emf.
 leads the emf by 90o.
 lags the emf by 90o.

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Electric Circuits
The internal resistance of a practical voltage source is considered to be connected in

None of these
 parallel.
 series.
 either parallel or series.

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