📡 Electronics and Communication Engineering (ECE) Solved MCQs with Answers

Practice 406 approved 📡 Electronics and Communication Engineering (ECE) questions with verified answers from the 🛠️ Engineering Essentials subject for Pakistan exams.

406 solved MCQs

An FM signal is less affected by ______.Answer: Noise A temperature-sensitive device is called a ______.Answer: Thermistor Operation of a transistor requires ______.Answer: None of these The process of adding impurities to semiconductors is called ______.Answer: Doping The minority carriers in P-type and N-type semiconductors are ______.Answer: Holes in N-type and electrons in P-type In full-wave rectification, the output DC voltage across the load is obtained from ______.Answer: Complete cycle of AC Electrons in a P-type semiconductor are ______.Answer: Minority carriers Analog signals vary ______.Answer: In time continuously The emitter in a transistor is ______ doped.Answer: Heavily doped Which of the following is not a donor impurity in a semiconductor?Answer: Aluminum The type of bonding in a semiconductor is ______.Answer: Covalent The barrier potential of a silicon PN junction is approximately ______.Answer: 0.7 V A high-pass filter passes ______.Answer: High-frequency signals Holes are like ______.Answer: Positive charge An operational amplifier (Op-Amp) has ______.Answer: High gain In a half-wave rectifier, the output is obtained across the load during ______.Answer: Positive or negative half-cycle The movement of holes from the P-type region toward the N-type region to fill electron vacancies is called ______.Answer: Diffusion In the active region of a BJT, the biasing of the junctions is ______.Answer: BE forward, CB reverse A neutral semiconductor has ______.Answer: Equal positive and negative charges A modulating signal generally has a ______ frequency compared with the carrier signal.Answer: Low frequency The working of a transistor as an amplifier is similar to a ______.Answer: Step-up transformer The velocity of an oscillating charge as it moves to and fro along a wire is always ______.Answer: Changing A question related to a Zener diode is ______.Answer: Breakdown Which of the following is not a property of semiconductors?Answer: They do not emit light Which of the following parameters best describes the movement of electrons inside a semiconductor?Answer: Mobility Which of the following parameter best describes the movement of electrons inside a semiconductor?Answer: Mobility FSK is used in ______Answer: Telegraphy Radio broadcasting uses ______.Answer: FM The rate of information that can be carried through a communication channel depends mainly on its ______.Answer: Bandwidth In radar, PRF stands for ______.Answer: Pulse Repetition Frequency