OP Amp MCQ Questions & Answers | Electrical Engineering

When amplifier stages are connected in parallel, the overall gain is not the product of the individual stage gains.

Parallel connection means the input signal is applied to multiple amplifier stages simultaneously, and their outputs are combined.

In this case, the gain of each path remains the same and does not multiply. Instead, the currents or voltages at the output may add, depending on how the stages are combined.

Overall gain in parallel configuration is determined by other factors such as how the outputs are summed and whether any loading effects are present.

In contrast, when amplifier stages are connected in series (cascaded), the overall gain is the product of the individual gains.

Therefore, the statement is false for parallel connection.

An operational amplifier (OP-amp) is a versatile electronic component designed to amplify a wide range of signals.

Both a.c. and d.c. signals: OP-amps are capable of amplifying both alternating current (a.c.) signals and direct current (d.c.) signals. They can be configured in various ways (e.g., as inverting, non-inverting amplifiers) to handle different types of signals and applications.

a.c. signals only: This is incorrect because OP-amps are not limited to amplifying only a.c. signals.

d.c. signals only: This is also incorrect because OP-amps can amplify both d.c. signals and a.c. signals.

neither a.c. nor d.c. signals: This is incorrect because OP-amps are designed to handle both types of signals.

Thus, Option C: both a.c. and d.c. signals is the correct answer.