Electronics (ECE) - MCQ Practice Questions

In a BJT differential amplifier, if both inputs are grounded and the tail current source has finite output impedance, what is the effect on CMRR?

What is the typical input impedance of a voltage follower (unity gain buffer) using an ideal op-amp?

In a transimpedance amplifier used for photodiode detection, increasing feedback resistance Rf causes which effect?

For a common-gate FET amplifier, which statement is correct?

What is the maximum theoretical efficiency of a Class AB amplifier?

In a Schmitt trigger circuit using op-amp, the hysteresis voltage is determined by which factor?

Which configuration minimizes the output impedance of an amplifier stage?

In a log amplifier circuit, what is the primary source of error in practical implementations?

For maximum power transfer from a source with internal resistance Rs to load RL, what should be the condition?

What is the input offset voltage of a typical precision op-amp (like OP07)?

In a summing amplifier with multiple inputs, what determines the output voltage?

Which type of feedback configuration increases both input and output impedance?

What is the slew rate of a standard 741 op-amp?

In a bridge amplifier circuit for sensor applications, what is the primary advantage?

What is the gain-bandwidth product (GBW) of a typical 741 op-amp?

In a two-stage RC coupled amplifier, why is a coupling capacitor used between stages?

For a bootstrapped voltage follower, what is the advantage over a standard buffer?

What is the bandwidth of a first-order low-pass filter with cutoff frequency fc = 1 kHz?

In a Wien bridge oscillator, what is the condition for sustained oscillation?

Which of the following statements about op-amp PSRR (Power Supply Rejection Ratio) is correct?