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Electric Circuits

Electric Circuits
The electrical conductivity of metal is typically of the order of (in ohm - m)

 10 - 6.
 105.
 107.
 10 - 4.

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Electric Circuits
Which of the followings is/are active element?

 Current source
 Voltage source
 None of these.
 Both

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Electric Circuits
In the given figure, the Thevenins equivalent voltage and impedance as seen from the terminals P - Q is given by

 2 V and 7.5 Ω.
 4 V and 5 Ω.
 4 V and 7.5 Ω.
 2 V and 5 Ω.

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Electric Circuits
If a resistor and an inductor are connected in series across a voltage source. Which two parameters in that circuit increase if frequency of voltage source increases?

 Z and I.
 VL and VR.
 VL and Z.
 VL and I.

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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?

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

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Electric Circuits
A current of 4 A flows in an ac circuit when 100 V dc is applied to it whereas it takes 250 v ac to produce the same current the power factor of the circuit is

 10.
 0.4.
 0.85.
 1.

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