Q. In a series RC circuit Z = (R² + ω²C²)^0.5.

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Q. If V = 20 + j20, then loge(A) A is

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Q. In an ac network the sum of currents entering a node is 10 ∠45°. The sum of currents leaving the node is

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Q. In an RC series circuit excited by dc voltage E, the current at t = 0 is

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Q. The current through a 10 Ω resistance in a dc circuit having two emf sources is 3A. If this resistance is changed to 20 Ω, the new value of current will be

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Q. An RLC series circuit has R = 30 Ω, XL = 30 Ω and XC = 30 W. Its impedance is

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Q. R, L and C are in parallel. The circuit is switched on to a constant current source I at t = 0. At t = ∞ the current through inductance is I.

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Q. As temperature increases, the temperature coefficient of metals increases.

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Q. In a 3 phase system, the zero sequence component of line to line voltages is zero

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Q. Magnetic effect of current is used in generators but not in motors.

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Q. For a nonlinear resistance

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Q. Assertion (A): For a physically realisable driving point function, the degree of numerator and denominator should be equal.

Reason (R): The sum of positive real functions is real.

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Q. An R-L series circuit has R = 5 Ω and L = .01 H. It is fed by ac 50 Hz supply. The rms current in the circuit is 5 A. The active power supplied by the source is

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Q. A particular current is made up of two components 10A dc and sinusoidal current of peak value 14.14A. The average of resultant current is

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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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