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Alpha, beta and base current from the fraction of emitter electrons reaching the collector

This type of question, asked 6 times: 2 May 2023 S1, 14 May 2024 S2, 20 Apr 2025 S2, 21 Apr 2025 S1, 18 Apr 2026 S2, 13 May 2026 S2. All 6 questions below, oldest first.

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  1. Question 1

    2 May 2023 S1

    33
    In an NPN transistor 101010^{10} electrons enter the emitter in 10−610^{-6} s and 2% electrons recombine with holes in base. The current ratios α\alpha and β\beta of a transistor are respectively (nearly)

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  2. Question 2

    14 May 2024 S2

    45
    In an n-p-n transistor, the collector current is 28 mA. If 80% of electrons reach the collector, its base current in mA is

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  3. Question 3

    20 Apr 2025 S2

    12
    In an n-p-n transistor amplifier, the collector current is 9 mA . If 90%90\% of the electrons emitted reach the collector, then

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  4. Question 4

    21 Apr 2025 S1

    41
    In an n-p-n transistor amplifier, the collector current is 8 mA. If 80%80\% of the electrons from the emitter reach the collector, then (α\alpha and β\beta are current ratios)

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  5. Question 5

    18 Apr 2026 S2

    148
    In an NPN transistor, the collector current is 28 mA. If 80% electrons reach the collector, its base current in mA is

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  6. Question 6

    13 May 2026 S2

    148
    In an n-p-n transistor the collector current is 99 mA. If 90%90\% of the electrons from the emitter reach the collector then

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