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Electric Circuits

Electric Circuits
In RLC series circuit R = 2Ω, L = 2mH and C = 1μF. Find the time constant of the circuit?

 4 msec
 2 μsec
 1 μsec
 2 msec

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Electric Circuits
If the practical units of voltage and current wave each made 20 times as large as they are at present, what would be the consequent alternation in the size of the unit of capacitance?

 Nil.
 200 times.
 20 times.
 60 times.

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Electric Circuits
The maximum value of a current wave is 2A. If the form factor of a current wave is 1.5 and the peak factor is 2.7, find the rms value in Amperes.

 0.741 A.
 1.414 A.
 1.57 A.
 0.494 A.

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Electric Circuits
R1 = 36 Ω and R2 = 75 Ω, each having tolerance of ±5% are connected in series. The value of resultant resistance is

  111 ± 0 Ω.
 111 ± 7.23 Ω.
  111 ± 5.55 Ω.
 111 ± 2.77 Ω.

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

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

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Electric Circuits
A parallel plate capacitor has a capacitance of C farad. It area of the plates is doubled and the distance between them is half, the capacitance of the capacitor is

 4C Farad.
 C Farad.
 16C Farad.
 2C Farad.

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