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Technical quiz questions with answers in electronics, basic electronics quiz MCQs, basic electronics FAQs pdf, technical quiz questions with answers in. MULTIPLE CHOICE QUESTIONS in. ELECTRONICS ENGINEERING. Santos S. Cuervo, ECE. Susana A. Tan, ECE. Encoded by: ASI, Rannilo Jr. L. OBJECTIVE QUESTIONS AND ANSWERS IN ONE PDF MCQ PDF · QUIZ OF DAY- 22/05/ GK & CURRENT AFFAIRS.
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.
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… 7. What is sampling? The process of obtaining a set of samples from a continuous function of time x t is referred to as sampling.
State sampling theorem. 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. What is pass band? Passband is the range of frequencies or wavelengths that can pass through a filter without being attenuated.
What is stop band? 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. Difference between mobile and a cell phone.
There is no difference, just language use, which differs from country to country, so in Britain it is called a mobile, and in USA and South Africa and other places a cell phone.
Even in Europe the name differs. This difference in British and American English is also evident in many other things we use every day, like lifts and elevators, nappies and diapers, pickups and trucks. The list goes on and on, any student of English has to decide which he or she will use, as the default setting. Explain RF? 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.
What is modulation? And where it is utilized? 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.
Define what is demodulation? 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. Name the modulation techniques. Explain AM and FM. 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. 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. How does a mobile work? When you talk into a mobile telephone it converts the sound of your voice to radiofrequency energy radio waves.
The radio waves are transmitted through the air to a nearby base station. The base station then sends the call through the telephone network until it reaches the person you are calling. When you receive a call on your mobile phone the message travels through the telephone network until it reaches a base station near to you.
The base station sends out radio waves, which are detected by your telephone and converted back to speech. The mobile phone network operates on the basis of a series of cells. Each cell requires a radio base station to enable it to function.
There are three types of base station and each has a particular purpose: The Macrocell is the largest type and provides the main coverage for mobile phone networks. The Microcell is used to improve capacity in areas where demand to make calls is high, such as shopping centres. The Picocell only has a range of a few hundred metres and may be used to boost weak signals within large buildings.
Each base station can only cope with a certain number of calls at any one time. So if demand exceeds the capacity of a base station an additional base station is needed. What is a base station? How many satellites are required to cover the earth? The life span of the satellite is about 15 years.
What is a repeater? What is attenuation?
Attenuation is the reduction in amplitude and intensity of a signal. Signals may attenuate exponentially by transmission through a medium, or by increments calculated in electronic circuitry or set by variable controls.
Attenuation is an important property in telecommunications and ultrasound applications because of its importance in determining signal strength as a function of distance. Their Facebook group is available in which I had solved many questions. Clear and easy solution of problems gave me an idea about the concept. It was very helpful to prepare subject from basics.
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I use to watch videos of Umesh Sir on Youtube these videos really helped me to clear most of my concepts. What Is Diode? Answer : 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. What Is Transistor? Answer : 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.
What Is Op-amp? Answer : An operational amplifier, often called an op-amp , is a DC-coupled high-gain electronic voltage amplifier with differential inputs 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.
What Is A Feedback? Answer : 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. Answer : Much attention has been given by researchers to negative feedback processes, because negative feedback processes lead systems towards equilibrium states.
Positive feedback reinforces a given tendency of a system and can lead a system away from equilibrium states, possibly causing quite unexpected results. What Is Cdma, Tdma, Fdma? Answer : Code division multiple access CDMA is a channel access method utilized by various radio communication technologies.