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Electric Circuits

Electric Circuits
Condition of symmetry in Z-parameter representation is

 Z11 = Z12.
 Z12 = Z21.
 Z12 = Z22.
 Z11 = Z22.

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

 2 msec
 1 μsec
 4 msec
 2 μsec

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Electric Circuits
Current efficiency in electroplating is usually

  99 %.
  90 to 98 %.
  50 to 60 %.
  70 to 80 %.

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Electric Circuits
The strength of current in 1 H inductor changes at rate of 1 A / sec. Find the voltage across it?

 2 V.
 1 V.
 None of these.
 0.5 V.

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Electric Circuits
Magnetic flux has the unit of

 Ampere turn
  Tesla
 Newton
 Weber

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Electric Circuits
If the length of a wire of resistance R is uniformly stretched to n times its original value, what will be its new resistance

  nR .
  R / n2.
  n2R.
  n2 / R.

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