Electronics (ECE) - MCQ Practice Questions

In a saturated BJT transistor used as a switch, the voltage drop VCE(sat) is typically

A BJT amplifier exhibits thermal runaway due to increased leakage current. Which design modification can best prevent this phenomenon?

Which configuration provides the highest input impedance and lowest output impedance among op-amp circuits?

For the oscillator to sustain oscillations, the loop gain must satisfy which condition (assuming phase shift is 360° or 0°)?

A Class B amplifier has two transistors operating in push-pull configuration. What is the maximum theoretical efficiency?

In an RC phase shift oscillator, how many RC sections are typically used to achieve 180° phase shift?

The Miller effect in a Common Emitter amplifier results in:

In a Wein bridge oscillator, the frequency of oscillation is given by f = 1/(2πRC). At what condition does oscillation start?

In a transimpedance amplifier (TIA), which parameter determines the transimpedance gain?

Which oscillator topology has the poorest frequency stability due to dependency on passive component tolerances?

For maximum power transfer from a source to load through an amplifier, what should be the relationship between source and load impedance?

An op-amp has an open-loop gain of 100,000 and a feedback resistor ratio of Rf/Rin = 10. What is the closed-loop gain?

In a Colpitts oscillator, the feedback network consists of:

A Class B power amplifier has two transistors. What is the primary advantage over Class A?

In a push-pull amplifier configuration, what is the phase relationship between the two transistor inputs?

An inverting amplifier has Rin = 10 kΩ and Rf = 100 kΩ. If the input signal is 100 mV, what is the output voltage?

Which parameter primarily determines the frequency stability of an RC oscillator?

A Class AB amplifier operates with a quiescent current (ICQ) that is:

In a differential amplifier using matched transistors, the Common Mode Rejection Ratio (CMRR) is primarily limited by:

For a Source Follower (Common Drain FET amplifier), what is the typical voltage gain range?