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Electric Circuits

Electric Circuits
A periodic voltage having the Fourier series V(t)= {1 + 4sinω0t}

 11 W.
 21 W.
 24.5 W.
 1 W.

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Electric Circuits
In RL series circuit R=2Ω and L=2mH. What is the value of time constant?

 1msec
 100sec
 4msec
 2msec

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Electric Circuits
Five cells are connected in series in a row and then four such rows are connected in parallel to Feed the current to a resistive load of 1.25Ω. Each cell has an emf of 1.5 V with internal resistance Of 0.2Ω. The current through the load will be

 3.33 A
 1 A
 23.33 A
 5 A

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

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

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Electric Circuits
A capacitor has a capacitance of 6 μF. Calculate the stored energy in it if a DC voltage of 100 V, is applied across it?

 3 × 102 joules.
 6 × 102 joules.
 2.5 × 102 joules.
 4 × 102 joules.

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Electric Circuits
A capacitor is charged by a constant 10 mA current sources which is turned on for 1 second. Assuming the capacitor is initially charge free; determine the charge delivered to and the power supplied by the source if the capacitor has a value of 1 mF.

 0.1C, 10MW.
 0.01C, 10MW.
 0.1C, 100MW.
 0.01C and 5W.

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