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Power gain of a CE amplifier from current gain and resistances

This type of question, asked 4 times: May 2021 S1, 21 Apr 2025 S2, 11 Apr 2026 S1, 14 May 2026 S2. All 4 questions below, oldest first.

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  1. Question 1

    May 2021 S1

    31
    For a common-emitter amplifier, the voltage gain is 40. Its input and output impedances are 100 Ω100\ \Omega and 400 Ω400\ \Omega, respectively. The power gain of the CE amplifier will be

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  2. Question 2

    21 Apr 2025 S2

    32
    In common emitter mode of a transistor, the current gain is 8 . The input impedance is 25kΩ25k\Omega and load resistance is 75kΩ75k\Omega. The power gain is

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  3. Question 3

    11 Apr 2026 S1

    149
    In common emitter transistor amplifier, the output resistance is 500 kΩ500\ \mathrm{k\Omega} and the current gain β=50\beta = 50. If power gain of amplifier is 5×1065 \times 10^6, what is the input resistance?

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  4. Question 4

    14 May 2026 S2

    150
    The current gain in the common emitter mode of a transistor is 1010. The input impedance is 20 kΩ20\ k\Omega and load resistance 100 kΩ100\ k\Omega. The power gain is

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