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Operational Amplifiers - Technical MCQs

Q1:

If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary?

A 6240 ohms

B 2.4 kilohms

C 410 ohms

D 0.62 kilohms

ANS:A - 6240 ohms

Gain= rf/ri
rf=gain*ri
rf=3.9*1.6*10^3=6.24*10^3=6240ohms