Electronics (ECE) - MCQ Practice Questions

In a Common Source FET amplifier, the gain is primarily dependent on which parameter?

A BJT amplifier operates in the saturation region. What is the approximate output impedance?

The input impedance of a Common Emitter amplifier is approximately equal to:

In a differential amplifier, the Common Mode Rejection Ratio (CMRR) is 80 dB. What is the CMRR in linear form?

A voltage follower (Common Collector) amplifier has a voltage gain of:

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?

In a BJT amplifier biased in the active region, what is the relationship between collector current and base current?

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

An op-amp integrator circuit has R = 10 kΩ and C = 100 nF. What is the time constant?

In a Common Gate FET amplifier, how does the input impedance compare to Common Source?

A summing amplifier has three inputs with Rf = 100 kΩ. If R1 = R2 = R3 = 10 kΩ and inputs are V1 = 1V, V2 = 2V, V3 = 3V, what is the output?

The gain-bandwidth product (GBW) of a typical general-purpose op-amp (like LM741) is approximately:

In a feedback amplifier with loop gain L = Aβ, the closed-loop gain is approximately:

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

The input impedance of an op-amp in an ideal configuration is assumed to be:

In a Common Emitter BJT amplifier, if the collector resistance is increased while keeping other parameters constant, how does the voltage gain change?