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Electric Circuits

Electric Circuits
Time constant is the time taken for response to rise -------of maximum value?

 100%
 63.2%
 68.3%
 90%

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Electric Circuits
Power factor can be defined as

 cosine of angle between voltage and current.
 both option B and C.
 sine of voltage and current.
 ratio of resistance versus impedance.

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Electric Circuits
In the circuit shown below, what is the voltage across 5 Ω resistor?

 34.4 V.
 None of them
 -27.4 V.
 -28.4 V.

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Electric Circuits
Consider the following circuit. In this circuit, when Vs = 3 V, I = 4 A, what is the value of I when Vs = 12 V?

 10 A.
 15 A.
 20 A.
 7 A.

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Electric Circuits
A 60 Hz frequency voltage would cause a bulb to turn on and off

 70 times per second.
 60 times per second.
 80 times per second.
 120 times per second.

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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.
 40.25.
 66.66.
 76.66.

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MORE MCQ ON Electric Circuits

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