Q. Assertion (A): In series R-L-C circuit, the current may lead or lag the voltage depending on the value of R.

Reason (R): Phase angle of an R-L series circuit is tan¯¹ (ωL/R).

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Q. A planar graph has 6 nodes and 7 branches. The number of meshes in the dual graph is

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Q. An ac voltage 20 sin 1000t feeds an R-C series circuit. R = 8 Ω and active power is 4 W. The power factor is

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Q. For a sine wave the average value is calculated over half the cycle.

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Q. Two resistances of 2 Ω each are connected in series. A shunt having zero resistance is connected across the combination. The overall resistance will be

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Q. The poles and zeros of a positive real function

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Q. In a linear circuit, the superposition principle can be applied to calculate the

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Q. If A = 7 ∠15, A² is

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Q. The colour coding of a resistors shows 100 K, ± 10%. When the resistance was measured with an ohmmeter, it read

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Q. The output voltage of a charger is

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Q. Threshold of perception occurs at a current of about 1 mA.

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Q. A current increasing at the rate of 1 A/s is passed through 1 F capacitor. At t = 0, i = 0. The charge stored after 1 second is

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Q. An RL impedance function can also be realized as

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Q. A step voltages is applied to RLC series circuit having R = 2 Ω, L = 1 H and C = 1 F. The transient current response will be

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Q. Class C solid insulators should not be used above 100°C.

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Q. Assertion (A): Superposition theorem can be used to find the output of a full wave rectifier excited by sinusoidal signal sources of different frequencies connected in series.

Reason (R): Superposition theorem is valid for all linear systems.

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Q. The current through a 1 mH inductance is i(t) = 2.56 x 10¯² - 4 x 10³ t for 2 ≤ t ≤ 20 μ sec. The voltage across the inductor is

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Q. A capacitor whose capacitance Ct = C₀ (1- cos ωt) is fed by a sinusoidal voltage v = V₀ sin ωt. The equation for current i is

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Q. Assertion (A): In a circuit having high inductance, reactive power may be more than apparent power.

Reason (R): Reactive power = VI sin θ.

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Q. A two branch parallel circuit has a 10 Ω resistance and 0.5 H inductance in one branch and a 100 μF capacitor in the second branch. It is fed from 100 V ac supply. At resonance, the source current is

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