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Electric Circuits

Electric Circuits
A wire of resistance R has it length and cross - section both doubled. Its resistance will become

 2R.
 0.5R.
 4R.
 R.

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Electric Circuits
The life of a lead acid battery is expected to be

 6 months.
 10 to 15 years.
 1 year.
 2 to 5 years.

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Electric Circuits
A series circuit consists of R = 20 Ω, L = 20 mH, and AC supply 60 V with f = 100 Hz. The voltage drop across L is

  31.9 V.
  39.1 V.
 50.5 V.
 45.5 V.

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Electric Circuits
Average power taken by the pure capacitor is

 Maximum
 Any of the above
 Minimum
 Zero

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Electric Circuits
In series RLC circuit what is the power factor just above the resonance frequency?

 Lagging
 Zero
 Leading
 Unity

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Electric Circuits
What is the dielectric material used in precision small value capacitor and capacitor used in radio frequency circuits?

 Oil impregnated paper.
 Titanium oxide.
 Vacuum, air.
 Glass.

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