Basic electronic questions and answers pdf

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basic electronic questions and answers pdf

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MCQs of Basic Electronics, 50 Questions

Ans: The study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles. If the electronic device is plugged into a standard wall outlet, there will be a transformer inside which will convert the AC voltage you are supplying to the required DC voltage needed by the device. Examples: Computer, radio, T. V, etc Electric devices use line voltage vAC, vAC, etc Electric devices can also be designed to operate on DC sources, but will be at DC voltages above 48v.

Examples: are incandescent lights, heaters, fridge, stove, etc Ans: Communication means transferring a signal from the transmitter which passes through a medium then the output is obtained at the receiver. Ans: Analog and digital communication. As a technology, analog is the process of taking an audio or video signal the human voice and translating it into electronic pulses.

Digital on the other hand is breaking the signal into a binary format where the audio or video data is represented by a series of "1"s and "0"s. Digital signals are immune to noise, quality of transmission and reception is good, components used in digital communication can be produced with high precision and power consumption is also very less when compared with analog signals.

Ans: Latch-up pertains to a failure mechanism wherein a parasitic thyristor such as a parasitic silicon controlled rectifier, or SCR is inadvertently created within a circuit, causing a high amount of current to continuously flow through it once it is accidentally triggered or turned on. Ans: In electronics, a diode is a two-terminal device. Diodes have two active electrodes between which the signal of interest may flow, and most are used for their unidirectional current property.

Ans: In electronics, a transistor is a semiconductor device commonly used to amplify or switch electronic signals. The transistor is the fundamental building block of computers, and all other modern electronic devices. Some transistors are packaged individually but most are found in integrated circuits. Ans: The process of obtaining a set of samples from a continuous function of time x t is referred to as sampling.

Ans: It states that, while taking the samples of a continuous signal, it has to be taken care that the sampling rate is equal to or greater than twice the cut off frequency and the minimum sampling rate is known as the Nyquist rate. Ans: Microwave essentially means very short wave. The propagation of the microwave takes place in spacewave in v. Ans: The frequency at which the response is -3dB with respect to the maximum response. Ans: Passband is the range of frequencies or wavelengths that can pass through a filter without being attenuated.

Ans: A stopband is a band of frequencies, between specified limits, in which a circuit, such as a filter or telephone circuit, does not let signals through, or the attenuation is above the required stopband attenuation level. Ans: Rheostat is a type of variable resistor which is used to control the flow of electric current by manually increasing or decreasing its resistance.

Ans: Demodulation is the act of removing the modulation from an analog signal to get the original baseband signal back. Demodulating is necessary because the receiver system receives a modulated signal with specific characteristics and it needs to turn it to base-band. Ans: An inductor is a passive electrical device employed in electrical circuits for its property of inductance. An inductor can take many forms. Ans: A substance, body, or device that readily conducts heat, electricity, sound, etc.

Copper is a good conductor of electricity. Ans: A semiconductor is a solid material that has electrical conductivity in between that of a conductor and that of an insulator An Insulator is a material that resists the flow of electric current.

It is an object intended to support or separate electrical conductors without passing current through itself ; it can vary over that wide range either permanently or dynamically. AM-Amplitude modulation is a type of modulation where the amplitude of the carrier signal is varied in accordance with the information bearing signal.

FM-Frequency modulation is a type of modulation where the frequency of the carrier signal is varied in accordance with the information bearing signal. This range corresponds to frequency of alternating current electrical signals used to produce and detect radio waves. Since most of this range is beyond the vibration rate that most mechanical systems can respond to, RF usually refers to oscillations in electrical circuits or electromagnetic radiation.

Ans: Modulation is the process of varying some characteristic of a periodic wave with an external signals. Radio communication superimposes this information bearing signal onto a carrier signal. These high frequency carrier signals can be transmitted over the air easily and are capable of travelling long distances.

The characteristics amplitude, frequency, or phase of the carrier signal are varied in accordance with the information bearing signal. Modulation is utilized to send an information bearing signal over long distances. Ans: AM is used for video signals for example TV.

Ranges from to kHz. FM is used for audio signals for example Radio. Ranges from 88 to MHz. Ans: Following are the parts of network management system:. Ans: 3 satellites are required to cover the entire earth, which is placed at degree to each other. The life span of the satellite is about 15 years. Ans: GPRS services are defined to fall in one of the two categories:. Some of the GPRS services are not likely to be provided by network operators during early deployment of GPRS due in part to the phased development of standard.

Market demand is another factor affecting the decision of operators regarding which services to offer first. Ans: An electronic device or electrical circuit that is used to boost amplify the power, voltage or current of an applied signal. Ans: To be usable for direct sequence spreading, a PN code must meet the following conditions:.

Ans: An oscillator is a circuit that creates a waveform output from a direct current input. The two main types of oscillator are harmonic and relaxation. The harmonic oscillators have smooth curved waveforms, while relaxation oscillators have waveforms with sharp changes. Ans: An integrated circuit IC , also called a microchip, is an electronic circuit etched onto a silicon chip. Their main advantages are low cost, low power, high performance, and very small size.

Ans: Handover in mobile communication refers to the process of transferring a call from one network cell to another without breaking the call. There are two types of handover which are as follows:.

Ans: Crosstalk is a form of interference caused by signals in nearby conductors. The most common example is hearing an unwanted conversation on the telephone. Crosstalk can also occur in radios, televisions, networking equipment, and even electric guitars. Ans: An operational amplifier, often called an op-amp , is a DC-coupled high-gain electronic voltage amplifier with differential inputs[1] and, usually, a single output. Typically the output of the op-amp is controlled either by negative feedback, which largely determines the magnitude of its output voltage gain, or by positive feedback, which facilitates regenerative gain and oscillation.

Ans: Bluetooth is designed to be a personal area network, where participating entities are mobile and require sporadic communication with others. It is Omni directional i. Ericsson started the work on Bluetooth and named it after the Danish king Harold Bluetooth. Bluetooth operates in the 2. It offers transfer speeds of around Kbps. Ans: Feedback is a process whereby some proportion of the output signal of a system is passed fed back to the input.

This is often used to control the dynamic behaviour of the system. Ans: Code division multiple access CDMA is a channel access method utilized by various radio communication technologies. CDMA employs spread-spectrum technology and a special coding scheme where each transmitter is assigned a code to allow multiple users to be multiplexed over the same physical channel.

An analogy to the problem of multiple access is a room channel in which people wish to communicate with each other. To avoid confusion, people could take turns speaking time division , speak at different pitches frequency division , or speak in different directions spatial division.

In CDMA, they would speak different languages. People speaking the same language can understand each other, but not other people. Similarly, in radio CDMA, each group of users is given a shared code. Many codes occupy the same channel, but only users associated with a particular code can understand each other.

Ans: Types of feedback: Negative feedback: This tends to reduce output but in amplifiers, stabilizes and linearizes operation. Negative feedback feeds part of a system's output, inverted, into the system's input; generally with the result that fluctuations are attenuated.

Positive feedback: This tends to increase output. Positive feedback, sometimes referred to as "cumulative causation", is a feedback loop system in which the system responds to perturbation A perturbation means a system, is an alteration of function, induced by external or internal mechanisms in the same direction as the perturbation.

In contrast, a system that responds to the perturbation in the opposite direction is called a negative feedback system. Bipolar feedback: which can either increase or decrease output. Ans: The generating system,transmission system,and distribution system.

Ans: An instrumentation amplifier is a differential op-amp circuit providing high input impedances with ease of gain adjustment by varying a single resistor. Ans: The whole of the geographical area is divided into hexagonal shape geometrical area called cell and each cell having its own transceiver.

Each BTS cell site allocated different band of frequency or different channel. Each BTS antenna is designed in such a way that i cover cell area in which it is placed with frequency allotted without interfering other sell signal. We help you to choose the right Python career Path at myTectra. Here are the top courses in Python one can select.

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MCQs of Basic Electronics, 50 Questions

A resistor with colour bands: red-red-red-gold, has the value:. A resistor and capacitor in series is called a:. If two resistors are placed in series, is the final resistance:. Which is not a "common" value of resistance? If a small value of capacitance is connected in parallel with a large value, the combined capacitance will be:.

Communication is a process of sending a signal from the transmitter which passes through a channel or medium; then the output is obtained at the receiver end. Also, we can define communication as the method of sending a message from one place to another. A diode is a two-incurable device.

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  • Are you a licensed electronic engineer professional? Ray L. - 23.05.2021 at 00:29

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