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# Electronic Devices And Circuits Questions And Answers Pdf

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Never use a LED without a current limiting resistor in a circuit - in most cases it will explode if you do!

Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface.

The study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles. Communication means transferring a signal from the transmitter which passes through a medium then the output is obtained at the receiver. Analog and digital communication.

## Electronic circuits pdf

Electronics Engineering , like any other engineering job, has many technical questions. To shine better at electronics engineering interview, you need to have a strong grip over the technical questions.

You need to keep yourself updated with e lectronics engineering interview questions to outperform other candidates. You do not want someone who has no knowledge about technical questions to outperform you in electronics engineering interview. It usually deals with low current voltage compared to Electrical Engineering specifically between v to 48v. Active components are those electrical components which require an external source for its full operation such as Diode, Transistor, Thyristor etc.

Passive components are those components which do not need any external source for its function. A resistor is an electronic component with two terminals, which resist or oppose the electrical current in its path. It also develops a voltage drop across its terminals, which depends on the current flowing through it. A capacitor is a two-terminal electronic component, which stores potential energy in the form of charge. The property or ability of the capacitor to store charge is called capacitance and it is measured in Farad.

An inductor is an electronic device, which resists the change in electrical current passing through it. It stores energy in the form of the magnetic field when the current pass through it. A voltage source having some internal resistance is called a practical voltage source. Due to this resistance, there is a voltage drop. The supply voltage of the practical voltage source decreases with an increase in the current.

If the internal resistance of a voltage source becomes zero the source is said to be an ideal voltage source. And its voltage does not decrease with the increase in current. F and Voltage P. The ideal current source has infinite internal resistance. Its current does not depend on its supply voltage. A practical current source has a large internal resistance.

Its supply current decreases with the increase in its supply voltage. Any combination of batteries and resistances in a linear circuit is equivalent to and can be represented by an ideal current source and a resistor in parallel. Any combination of batteries and resistance in a linear circuit can be represented by a signal voltage source and a resistor in series. A transistor is a three-terminal semiconductor device. It is can be used for amplifying or switching an electrical signal.

In the active region , the transistor acts as an amplifier. In the saturation region , the transistor acts as a closed switch. In the cutoff region , the transistor acts as an open switch. A clipper is a circuit that clips or cutoff voltage above or below a certain specified level.

Positive clipper cuts off a portion of positive half of a signal while negative clipper cuts off from the negative half. A clamper is a circuit that adds voltage in the positive or negative half of the signal to a specified peak voltage. A clamper moves the whole signal up and down to reach the specified peak voltage. A diode can allow current in only one direction which is known as forward bias. The voltage drop of a silicon diode is 0. Silicon crystals are more resistant to heat than germanium.

Silicon diode has a high voltage rating than the germanium diode. Silicon diodes are more preferable because silicon is available in abundant compared to germanium. BJT is bipolar that is there is a flow of both minority and majority charge carriers, while FET is unipolar that is there is a flow of only majority carriers.

A transformer is a static electrical device which transfers electrical energy from one circuit to another circuit without any physical connection instead it uses the principles of electromagnetic induction.

An oscillator is an electronic circuit which generates a periodic AC signal from a DC source. An oscillator has no input. The output of oscillator can be sinusoidal or Square or a triangle wave. The transfer of information from one place to another place using some sort of medium is called Communication. The information could be in any form such as a sound or visual or electrical signal etc. A signal consisting of significantly lower frequency up to 10 kHz is known as a baseband signal.

Example of the baseband signal is voice Hz to 3. The baseband signal cannot be transmitted directly through the antenna. They are transmitted using copper wire or fiber optics etc. A signal consisting of significantly higher frequencies Higher than kHz is known as Passband or BandPass signal. Bandpass signal does not contain any frequency lower than kHz. Bandpass signal can be directly transmitted through the antenna. Modulation converts a baseband signal into a passband signal making it suitable for long distance communication using an antenna.

Antenna size also depends on the frequency of the transmitting signal, so the modulation allows us to use a small size antenna. Using Modulation we can assign different frequencies to different signals which allow us to send multiple signals using the same medium without interference.

The demodulation is a process of extracting the information or message signal from the received or modulated signal. Two main types of modulation are Analog modulation and Digital modulation. Analog modulation is further divided into three types;. Phase modulation PM :.

Whereas, Digital modulation is further divided;. Digital Frequency modulation: FSK. AM signals can be affected by noise as the information lies in the amplitude of the signal, while FM is immune to noise because the information lies in the frequency of the signal. While in FM, the transmitter and receiver have a complex design.

AM signal can travel long distances as compared to FM signals. As we know that a transmitted signal loses its power when it travels long distances. To retain and maintain its full power, the signal is boosted through a device known as a repeater for long distance communication. Usually, a repeater retransmits the identical signal but it may change the medium or frequency of the signal according to the need.

Analog signal has continuous time and continuous amplitude while digital signal has discrete time and discrete amplitude. Digital signal is a signal which has discrete time and discrete amplitude.

Discrete signal often known as the discrete-time signal is a signal, which has discrete time but continuous it can have any value amplitude. Sampling is a process of converting a continuous time signal into a discrete time signal but not a digital signal. Aliasing is a signal effect related to sampling. When a signal is sampled at a sampling rate less than the required rate, the signal becomes indistinguishable from other signals and after reconstruction, the signal does not look anything like the original signal.

This effect is called Aliasing. A Filter is an electronic circuit that removes specific or unwanted frequency components from a signal. The types of filters are:. A filter rejects or passes frequency components below or above cutoff frequency depending on the type of the filter.

The cutoff frequency is taken at -3db Half power of the maximum amplitude. The passband is the range of frequencies that can be passed through the filter without any attenuation. The stopband is the range of frequencies that are attenuated and cannot be passed through the filter.

The notch filter is a type of band stop filter with very narrow stop band. Band stop filter rejects a wide range of band while notch filter rejects a very narrow band.

The notch filter is used for suppressing powerful laser beams. A digital logic gate is an electronic device which implements the Boolean function. The boolean function performs a logical operation on one or more than one binary numbers.

There are seven basic logic gates. Basic logic can be combined together to make these gates. A universal gate is a logic gate which can be solely used to implement any kind of boolean function. In digital logic, a Specific level of voltage is represented by binary numbers i. Latch and flip-flop are memory devices with two stable states. They are used for storing data states in sequential logic.

The states are controlled using one or more than one control signals. It can store one bit of data. So we can say that latches are level-triggered devices and flip-flops are edge-triggered devices. The level trigger means that the device will change its state according to the previous state, next state input and the level stable 1 or 0 of the control signal.

Combinational logic does not have a memory that is its current output depends only on the current input. While sequential logic has a memory and its current output depends on the previous output and current input. These two Digital binary adders are differentiated based on the carry determining technique.

## Electronic Devices and Circuits - EDC Previous year question solutions

You all must have this kind of questions in your mind. Below article will solve this puzzle of yours. Just take a look and download the study materials. Important Questions. Question Papers. Question Banks. Thank you for visiting my thread.

Electronics Engineering students need to face some Basic Electronics Questions whether they are preparing for an interview or viva voce. So, this article gives you few Basic Electronics Questions for Interview and other competetive exams. Generally, you need to refer a variety of books in order to cover the ocean of topics in Electronics. What is an ideal voltage source? Answer: A device with zero internal resistance.

## Electronics Interview Questions

Electronics Engineering , like any other engineering job, has many technical questions. To shine better at electronics engineering interview, you need to have a strong grip over the technical questions. You need to keep yourself updated with e lectronics engineering interview questions to outperform other candidates.

Solved examples with detailed answer description, explanation are given and it would be easy to understand. Here you can find objective type Electronics and Communication Engineering Electronic Devices and Circuits questions and answers for interview and entrance examination.

### Electronic Devices and Circuits - EC8351, EC6202

Multiple choice questions are perhaps the easiest to complete - you simply put a cross in a box - however, the questions often have two answers that could, at first glance, be correct. This is why we offer the ebook compilations in this website. Take the Quiz and improve your overall Engineering. The 3 wrong answers for each question are randomly chosen from answers to other questions. As understood, deed does not suggest that you have fabulous points.

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