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Electric Circuits

Electric Circuits
For occurrence of resonance which of the following elements are required?

 L
 Both 2 and 3
 R
 C

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Electric Circuits
Instantaneous power in inductor is proportional to the

 square of instantaneous current.
 temperature of the inductor.
 product of the instantaneous current and rate of change of current.
 square of the rate of change of current.

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Electric Circuits
Coating generally recommended for hard surfacing is

 chromium plating.
 copper plating.
None of these
 lead plating.

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Electric Circuits
The switch S is the circuit shown in figure is ideal. If the switch is repeatedly closed for 1 ms and opened for 1 ms, the average value of i(t) is

 1 mA.
 0.5 mA.
 0.35 mA.
  0.25 mA.

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Electric Circuits
From the circuit diagram shown in question 1 find the thevnin voltage.

 3 V.
 1.5 V.
 15 V.
 5 V.

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Electric Circuits
A 50 μF capacitor is charged to retain 10 MJ of energy by a constant charging current of 1 A. Determine the voltages across the capacitor?

 50 V.
 30 V.
 20 V.
 60 V.

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