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R1 represents the impedance of the input circuit. R2 represents the input-signal-developing impedance, and R3 represents the output impedance. Figure 2-11.—Variable input and output impedances. R1 and R2 form a voltage-divider network for the input signal. When R2 is increased in value, the input signal to OP Amp MCQ question is the important chapter for a Electrical Engineering and GATE students. The output of a particular OP-amp increases 8V in 12µs. The slew rate is. The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k.