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Electric Circuits

Electric Circuits
The Laplace Transform of a shifted unit step f (t) = U (t-a) is

 se-as.
 s(1-e-as).
 (e-as)/s.
 e-as.

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Electric Circuits
Total power consumed in the circuit below is 10 W. Find X.

 None of these.
  2 A.
 3 A.
 1 A.

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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

 0.4.
 0.85.
 0.6.
 0.9.

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Electric Circuits
In active filter which element is absent?

 Resistor.
 Capacitor.
 Inductor.
 Both of above.

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Electric Circuits
In a lead acid cell PbSO4 formed during

  discharging only.
  both during charging as well as discharging.
  neither during charging nor discharging.
  charging only.

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Electric Circuits
In RLC parallel circuit if current through capacitor and inductor is equal. Then What is the power factor?

 leading
 zero
 unity
 lagging

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