In deriving ac equivalent circuit for an amplifier circuit we short circuit

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In deriving ac equivalent circuit for an amplifier circuit we short circuit all capacitors.

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The first stage of a two-stage amplifier has a voltage gain of 10, a 600 Ω input resistor, a 1600Ω equivalent noise resistance and 27kΩ output resistor. For the second stage, these values are 25, 81kΩ, 19kΩ, and 1MΩ, respectively. Calculate the equivalent input-noise resistance of this two stage amplifier. A. 2,518 kΩ B. 2,518 Ω C. 251.8 Ω D. 12,518 Ω

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In a reinforced concrete column, the cross –sectional area of steel bar is as and that of concrete ia AC; the equivalent area of the section n terms of concrete is equal to. (a) As+mAc (b) Ac+mAs (c) As-mAc (d) Ac-mAs

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