Q. Evaluate the value of 2 [u (t - 1) - u (1 - 2t)] (u ( t + 1) + u (t)) at t = 3 sec.

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Q. Assertion (A): In an R-L circuit having high inductance, the rise of current is very slow.

Reason (R): The time constant of R-L circuit is L/R.

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Q. An air cored coil has an inductance of 0.3 H. If another coil has an iron core of μᵣ = 500, the remaining quantities being the same, the inductance of the second coil will be

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Q. An RC series circuit is charged by a voltage E. After a long time the battery is removed and a short circuit is placed across R-C. Then

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Q. Two coils having self inductances of 10 mH and 40 mH are mutually coupled. The maximum possible mutual inductance is

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Q. Thevenin's impedance of an ac network is in general

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

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Q. A dielectric does not have leakage current.

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Q. A series RLC circuit has a resonant frequency of 1000 Hz. The maximum voltage across C is likely to occur at a frequency of about

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Q. The resistance of a 230 V, 100 W lamp is

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Q. System function H(s) = 1/s+3, For a signal sin 2t, the steady state response is

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Q. A network has two branches in parallel. One branch contains impedance Z1 and the other branch has impedance Z2. If it is fed from an ac voltage V of frequency f, the current through Z1 depends, on

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Q. When a lead acid cell is in fully charged condition the positive and negative plates are similar.

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Q. Two capacitors of 1 μF and 2 μF capacitance are connected in parallel across a 30 V dc battery. After the capacitors have been charged, the charges across the two capacitors will be

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Q. A thermistor is used for

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Q. In a series RLC circuit excited by e = Em sin ωt is seen that LC < 1/ω². Then

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Q. When a lead acid battery is being charged, the specific gravity of the electrolyte

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Q. Assertion (A): The response of a network to unit impulse can be obtained directly from the network function.

Reason (R): The response of a network for any input can be obtained from impulse response.

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Q. Which statement is true for an ac circuit?

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Q. Three inductors each 30 mH are connected in delta. The value of inductance or each arm of equivalent star is

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