Electronics (ECE) - MCQ Practice Questions
Practice free Electronics (ECE) multiple-choice questions with detailed answers and explanations. Perfect for competitive exam preparation.
400 questions | 100% Free
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?
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:
In a Push-Pull (Class B) amplifier, what is the primary disadvantage that Class AB configuration addresses?
In a feedback amplifier, negative feedback is applied by feeding back output to which junction?
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?
In a transimpedance amplifier used for photodiode detection, increasing feedback resistance Rf causes which effect?