Q. An excitation is applied to a system at t = T, and its response is zero for -∞ < t < T, such a system is

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Q. Substitution theorem applies to

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Q. An R-L circuit has an initial current of 5 A. In the s-domain equivalent circuit, the voltage source to take into account the initial current has a strength of

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Q. A function f(t) = k is

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Q. Transient current in a loss free LC circuit when excited from an ac source is an __________ sine wave.

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Q. If the transfer function has zeros only on jω axis or in left half plane, it is a minimum phase function.

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Q. In a 5.6 ohms, ± 10% carbon composition resistor, the colour of the third strip from extreme left is

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Q. Assertion (A): Most of magnetic circuits have an air gap.

Reason (R): An air gap has high reluctance.

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Q. The total lumens emitted by a source of 1 candle are

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Q. In an electrochemical process the mass of material deposited at an electrode is proportional to

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Q. Choose the correct option

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Q. What would be the rms value of a sine wave having the same peak value as that of the above mentioned periodic wave?

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Q. Which of the following is true for RC impedance?

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Q. The impedance of a coil above self-resonant frequency is

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Q. Wire-wound resistors are unsuitable for use at high frequencies because they

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Q. A function Z(s) has zero at infinity if

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Q. If f1 and f2 and half-power frequency and f0 be resonant frequency, the selectivity of R-L-C series circuit is given by

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Q. In a power system, reactive power is necessary for

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Q. A periodic voltage has following values for equal time intervals changing suddenly from one value to next, 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, -5, -10 etc. then rms value of the waveform is

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Q. Assertion (A): When capacitor is fed by a dc voltage given a capacitor behaves as short circuit at t = 0 and open circuit at f = ∞.

Reason (R): The impedance of a capacitor is 1/Sc

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