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Electric Circuits

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

 zero.
 maximum.
 minimum.
 VI.

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Electric Circuits
In series RLC circuit to get Q>1, which of the following is required?

 XL > R
 XL < R
All of these
 XL = R

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Electric Circuits
Four resistances 80 Ohm, 50 Ohm, 25 Ohm and R are connected in parallel. Current through 25 Ohm resistance is 4A. Total current of supply is 10A. The value of R will be

 36.36.
 76.66.
 40.25.
 66.66.

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Electric Circuits
Time constant of RC series circuit is

 2RC
 L/R
 2L/R
 RC

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Electric Circuits
KCL works on the principle of which of the following

None of these
 both.
 law of conservation of energy.
 law of conservation of charge.

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Electric Circuits
The hot resistance of a tungsten lamp is about 10 times the cold resistance. Accordingly, cold resistance of a 100 W, 200 V lamp will be

 400 Ω.
 800 Ω.
 4 Ω.
  40 Ω.

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