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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?

 2 msec
 2 μsec
 1 μsec
 4 msec

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Electric Circuits
The phase angle difference between current and voltage is 90o, the power will be

 minimum.
 VI.
 maximum.
 zero.

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Electric Circuits
The instantaneous values of line current into a delta connected load in any two lines are + 2.5 amps and - 1.25 amps the current in the third line at the instant is ___________ A.

 2.5
 10
 1
 - 1.25

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Electric Circuits
A balanced star connected load with impedance of 30j - 300 Ω is supplied from a 3 - phase, 4-wire, 173 V system, the voltages to neutral being 100j -900, 100j - 300 and 100j -1500 V. The current in neutral wire is

  zero.
  5 A.
  8.85 A.
  50 A.

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Electric Circuits
Current efficiency in electroplating is usually

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

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Electric Circuits
Number of branches of a graph should be --------- number of branches of a network

 equals to
 greater than
 less than
 less than equals to

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MORE MCQ ON Electric Circuits

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