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Analog Electronics - Engineering

Q1:

Ac signals are given to both inverting and non-inverting terminals of an op-amp. When will the output maximum

A when the phase difference between the inputs is 0°

B when the phase difference between the inputs in 90°

C when the phase difference between the inputs is 180°

D when the phase difference between the inputs is 0 or 180°

ANS:C - when the phase difference between the inputs is 180°

For non-inverting terminal input, output is in phase with input. For inverting terminal input, output is 180° out of phase with input. If inputs have 180° phase difference, outputs will be in phase and additive.