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Electric Circuits

Electric Circuits
In RLC parallel network R = 2 Ohm, L = 2mH and C = 1μF. Find the value of time constant?

 4 μsec
 2 μsec
 4 msec
 2 msec

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Electric Circuits
Efficiency of electrical machines should be calculated by measuring

 losses and input.
 losses and output.
 losses.
 output and input.

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Electric Circuits
In the circuit given below the value of resistance Req is

 11.18 Ω.
 11.86 Ω.
 10 Ω.
 25 Ω.

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Electric Circuits
A piece of copper and another piece of germanium are cooled from room temperature to 80K. The resistance of

 copper decreases and germanium increases.
 each of them increases.
 copper increases and germanium decreases.
 each of them decreases.

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Electric Circuits
What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?

 38.
 39.
 19.
 20.

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Electric Circuits
In a series resonant circuit impedance is

 maximum.
 minimum.
 zero.
 none of these.

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