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What is the total voltage gain of a cascading transistor amplifier if the gain of first stage is 14dB, gain of the second stage is 12dB and gain of third stage is 24dB?

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What is the total voltage gain of a cascading transistor amplifier if the gain of first stage is 14dB, gain of the second stage is 12dB and gain of third stage is 24dB?

(a) 40dB

(b) 50.32dB

(c) 50dB

(d) 40.32dB

The question was posed to me in a national level competition.

My question is taken from Cascading Transistor Amplifiers topic in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

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Right choice is (c) 50dB

Easy explanation: The total gain of a cascading transistor amplifier is the sum of the multiple stages when the gain is calculated is decibels. Given, AV1 = 14dB, AV2 = 12dB and AV3 = 24dB

AV = AV1 + AV2 + AV3 = 14dB + 12dB + 24dB = 50dB

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