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Electric Circuits

Electric Circuits
The value of unity impulse function at time (t) = 0 is

 infinite.
 1.
 indeterminate.
 0.

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Electric Circuits
A capacitor has a capacitance of 6 μF. Calculate the stored energy in it if a DC voltage of 100 V, is applied across it?

 3 × 102 joules.
 4 × 102 joules.
 2.5 × 102 joules.
 6 × 102 joules.

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Electric Circuits
Power factor can be defined as

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

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Electric Circuits
An ac voltage source v = vo sinωt is connected across a parallel plate capacitor C. If the conductor current is ic and the displacement current is id, then which is true among following relation

 ic = id.
 ic < id.
 ic > id.
 ic + id = 0.

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Electric Circuits
In a capacitive circuit, the capacitive reactance is

 indirectly proportional to the square of frequency
 directly proportional to frequency
 indirectly proportional to frequency
 directly proportional to the square of frequency

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Electric Circuits
The energy stored by a capacitor is given by

 1/2 CV2.
 all of them.
 Q2 / 2C.
 1/2 QV.

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