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What is the total voltage gain of an n-stage cascading amplifier if the gain of stages are 5dB, 14dB, 20dB, 15dB and 24dB?

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What is the total voltage gain of an n-stage cascading amplifier if the gain of stages are 5dB, 14dB, 20dB, 15dB and 24dB?

(a) 76dB

(b) 46dB

(c) 78dB

(d) 79dB

This question was posed to me in semester exam.

The above asked question is from N-Stage Cascading Amplifiers topic in portion Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Correct option is (c) 78dB

The best explanation: The total gain of ann-stage cascading amplifier is the sum of the gain measured at each stage only when the gain is calculated is decibels. Given, AV1 = 5dB, AV2 = 14dB, AV3 = 20dB, AV4 = 15dB and AV5 = 24dB

AV = AV1 + AV2 + AV3 + AV4 + AV5 = 5dB + 14dB + 20dB + 15dB + 24dB = 78dB

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