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Electric Circuits

Electric Circuits
Consider the following circuit : Switch is closed at t = 0 Find i(0 +)

 (V*L) / (R*C)
 V / {R + (sL + 1 / Cs)}.
 0.
 V/R.

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Electric Circuits
Constant K type HPF (high pass filter) having cut off frequency 12 KHz and nominal impedance Ro = 500 Ω Find shunt arm inductor L and series arm capacitance C for T and π section of HPF ?

 L = 3.316 mH, C = 0.0132 μF.
 L = 0.0132 mH, C = 0.0132 μF.
 None of these.
 L = 3.316 mH, C = 132 μF.

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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

  50 A.
  zero.
  5 A.
  8.85 A.

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Electric Circuits
Three resistors of 4 ohm, 6 ohm and 8 ohm are in parallel. In which resistor, power dissipation will be maximum

 4 Ohm.
 equal in all resistors.
 8 Ohm.
 6 Ohm.

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Electric Circuits
The efficiency in case of maximum power transfer theorem is

 less than 50 %.
 100 %.
 50 % - 100 %.
 50 %.

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Electric Circuits
Two resistances R1 and R2 give combined resistances 4.5 Ω and 1 Ω when they are connected in series and parallel respectively. What would be the values of these resistances?

 3 Ω and 9 Ω.
  3 Ω and 6 Ω.
 6 Ω and 9 Ω.
  1.5 Ω and 3 Ω.

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