Q. Consider the following statements associated with two port networks.

1. Z12 = Z21
2. Y12 = Y21
3. h12 = h21
4. AD - BC = 1

Which one of the statement given above are correct?

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Q. Assertion (A): The number of basic loops is equal to number of links.

Reason (R): The graph theory helps in choosing independent variables in circuit analysis.

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Q. In an R-L-C circuit, v(t) = 20 sin (314 t + 5 π/6) and i(t) = 10 sin (314 t + 2π/3). The p.f of the circuit is

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Q. A network has two sources of different frequencies. The only method of analysis which can be used to find current and voltages of different branches is the use of

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Q. For a series R-L-C circuit tuned at resonant frequency which of the following statements is correct?

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Q. A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled, then the voltage across each resistor is

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Q. If operator 'a' = 1 ∠120° then (1 + a + a²) =

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Q. In any network of linear impedances the current flowing at any point equal to algebric sum of currents caused to flow at that point by each of the emf taken separately with all other emfs reduced to zero. The statement represents.

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Q. The Kirchoff's laws fail in which of the following circuits?

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Q. A black box has one of the elements our of R, L, C. when a 220 V a supply is connected the current supplied by source is I. when a 0.1 F capacitor is connected in parallel with the box, the current is 2I. The element is

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