📡 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

The other name for beta of BJT isAnswer: Current amplification factor When the bias in an FET stops the flow of current, the condition is calledAnswer: Pinch-off In N-type semiconductor, the minority carriers areAnswer: Holes A power gain of 30dB is equivalent to which amplification factor?Answer: 1000 UJT when used for triggering as SCR, has waveformAnswer: Sawtooth waveform Input impedance of op-amp isAnswer: Low In case of conductors, free electrons are completely filled in which band?Answer: Conduction Band A low-pass filter allows which frequencies to pass through?Answer: Low frequencies In a transistor symbol, the arrow is located on which terminal?Answer: Emitter Acceptors and donors in semiconductors are associated with which types of semiconductor?Answer: P-type and N-type An optical detector is ______.Answer: PIN photodiode Silicon and germanium are ______.Answer: Tetravalent The device which is used as fast counters in electronics is ______.Answer: Photodiode A non-inverting amplifier has ______.Answer: High input impedance A message travels from the transmitter to the receiver through a ______.Answer: Channel Which type of diode is commonly used in lamps for producing light?Answer: LED Thermions are ______.Answer: Electrons The depletion region in a PN semiconductor is due to ______.Answer: Doping Maximum current flows in a BJT through the ______.Answer: Emitter To decrease interference, the signal should be ______.Answer: Modulated Bandwidth of FM is ____ than AM.Answer: More ICBO is ______ with temperature.Answer: Increased The frequency range from 1 GHz to 30 GHz is called ______.Answer: Microwave Microwave communication is used in ______.Answer: Telephone Video signals in TV are transmitted using ______.Answer: AM Discrete signals are ______.Answer: A sequence of pulses High energy gap is found in ______.Answer: Insulators The depletion region of a junction is formed ______.Answer: When the P and N regions are joined Sound signals in TV are transmitted using ______.Answer: FM In FM, amplitude ______.Answer: Remains constant