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Electric Circuits

Electric Circuits
The active and reactive power in an AC circuit are 10W and 20VAR respectively. What is the power factor?

 1.
 0.577.
 0.866.
 0.5.

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Electric Circuits
A current of 4 A flows in an ac circuit when 100 V dc is applied to it whereas it takes 250 v ac to produce the same current the power factor of the circuit is

 0.85.
 10.
 0.4.
 1.

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Electric Circuits
If all the elements in a particular network are linear, then the superposition theorem would hold, when the excitation is

 DC only
 AC only
 An Impulse
 Either AC or DC

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Electric Circuits
The linear circuit element is

 inductor.
 capacitor.
 resistor.
 all of above.

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Electric Circuits
Which of the following has positive temperature coefficient ?

  Paper.
  Gold.
  Rubber.
  Germanium.

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

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