Electronics (ECE) - MCQ Practice Questions

A non-inverting amplifier is constructed with an op-amp having open-loop gain A₀ = 100,000. If Rf = 90 kΩ and Rin = 10 kΩ, what is the closed-loop voltage gain?

What is the primary advantage of a Darlington pair configuration in BJT amplifiers?

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

A BJT is operated in the saturation region. Which of the following statements is true?

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

In a two-stage cascaded amplifier, the first stage has gain A₁ = 50 and bandwidth BW₁ = 100 kHz, while the second stage has A₂ = 20 and BW₂ = 200 kHz. What is the overall voltage gain?

A voltage-controlled voltage source (VCVS) has transconductance gm = 50 mS. If the input voltage is 10 mV, what is the output current?

In a Wien Bridge oscillator, the frequency of oscillation is determined by:

What is the phase shift introduced by a first-order RC low-pass filter at the cutoff frequency (fc)?

A trans-impedance amplifier (TIA) has feedback resistor Rf = 1 MΩ. If the input current is 1 μA, what is the output voltage?

In a Class A amplifier operating at quiescent point Q, if the load line intersects the characteristic curve at VCE = 6V and IC = 50 mA, what is the maximum output power swing (assuming linear operation)?

Which of the following topologies provides the highest input impedance for an amplifier?

In a precision rectifier (ideal diode) circuit using op-amp, what is the key advantage over conventional diode rectifiers?

A cascode amplifier configuration is preferred over single-stage amplifier because it provides:

For a photodiode amplifier using trans-impedance configuration, increasing the feedback resistance Rf by 10 times will affect the noise figure and gain as:

In a Push-Pull (Class B) amplifier, what is the primary disadvantage that Class AB configuration addresses?

A current mirror circuit using matched BJTs has output impedance of approximately:

In an instrumentation amplifier using three op-amps, what is the primary function of the first stage (two non-inverting amplifier configuration)?

A common-source FET amplifier with active load has voltage gain Av = -gm/gm,load. To maximize gain, which statement is true?

In a feedback amplifier, negative feedback is applied by feeding back output to which junction?