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Electronics Engineering
Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.
24,372 Questions
Why semiconductor photo-diodes are reverse biased?
Because if you forward-biased them they would always conduct, even in total darkness.
What precautions should be observed when soldering printed circuit boards?
Never use a acid core solder only resin core should be used and keep the temperature of the soldering iron as low as possible 250 deg C max soldering should be done in a well ventilated space.
Its a security system similar to flash fog, that uses fog to stop a burglar, the intent is that he cannot find what he is looking for (literally). flashfog takes it up one more step, as it also includes a strobe light, that further cuts visibility by a factor of 3.
more info at www.flashfogsecurity.com
Are cross-element Yagi antennas always circularly polarized?
No. They can be circularly polarized with the correct phasing harness, or used as a way to switch between horizontal and vertical polarization with one antenna. No. They can be circularly polarized with the correct phasing harness, or used as a way to switch between horizontal and vertical polarization with one antenna.
What is the use of universal high resistance voltmeter?
A voltmeter must have a very high resistance to measure voltage. A voltmeter is placed in parallel with the element that you are measuring. If the voltmeter has a low internal resistance, then all of the current will flow through the voltmeter instead of the element. You want all of the current to flow through the element, to get an accurate reading of the voltage.
Conversely, an ampmeter must have zero resistance, because it is placed in series with the element.
How do you determine which wire on a led or capacitor is the negative end?
on an LED, the negative end is the shorter side.
on a capacitor, the negative end usually has some kind of marking on it, whether its a line, or an arrow or something.
with ceramic disk capacitors, there is no negative end, you just attach each side to a positive end, usually for a solar panel or something to store energy.
That is not a question. I tend to regard myself as a rather intellegient individual, but no matter how I try to wrap my head around this "question" I cannot begin to parse it in any manner that could possible lead to being able to understand what sort of information is being requested, let along being able to provide it.
Please try again, but rephrase it such that it is actually a question.
Let me provide you with some examples:
"What is flashover in a DC motor?"
"Given {fill in this area} Am I likely having troubles with flashover"
"What causes flashover"
You now owe me.
This "question" was not even worth trolling. Enroll in remedial english classes immediately.
The only possible excuse you could offer to stave off wrath is "The contents of this message are the results of a translation program."
What are the different RTD types?
2 wire.3 wire nd 4 wire...rtd...
3 wire rtd is widly used....hv good accuracy...
There are so many different types of diodes. Some of the common examples include light emitting diodes, silicon diodes, zener diodes and so many more.
Suggest another circuit for generating the ASK signal?
suggest another circiut for generating the ASK signal
DC blocking in a transistor is achieved by?
Including a series capacitor in the input and/or output circuit of the transistor. If the capacitor in the output circuit is omitted there will be a dc component in the output.
What is the Primary function of a voltage follower circuit?
Its purpose is to provide approximately the same voltage to a load as what is input to the amplifier, but at a much greater current. In other words, it has no voltage gain, but it does have current gain.
How do you discharge a 1 farad capacitor?
You could try licking the electrodes but that might hurt. I would just connect the electrodes with a screw driver that has a thick plastic handle, but if u mean discharge it in a circut just use a transistor
Is the Doppler radar the only satellite radar in the world?
Actually the Doppler Radar aka nexrad Next generation radar is not a satellite it is a radar. Satellites are floating around the world in space and Doppler radars are here on earth to monitor weather. As far as I know the Doppler radar is the only weather radar in the world. It is basically the only thing used for monitoring weather.
I the above is not quite correct. Weather radars come in two basic types coherent and non-coherent. The Coherent radar come in Doppler Radar which can be FMCW or Active Pulse Doppler. The non coherent Pulse Radar merely aim high energy pulses at the clouds and display the returned power in a colour display. The coherent version integrates many pulses together to gain a Higher signal to Noise and to detect water drops moving in clouds. That aside, to answer the question which has nothing to do with weather radar, Doppler radar is frequency used in space verticals because its coherent processing gains in achieves help to offset the ranges it operates over, but it is not the only radar technique to be used on satellites and it depends on what the radar is trying achieve. Note that Doppler radar is non a synonymous exclusively of "nexrad Next generation radar".
A potentiometer.
A full adder is a logical unit. The full adder must obey truth tables. They are simple, but are not speedy.
Why voltmeter called voltmeter?
To meter is to measure. A voltmeter is so called because it measures volts.
An Italian scientist named Galvani was dissecting a dead frog, and noticed the muscles twitching each time he touched them with a metal scalpel. He reported this observation. Another Italian scientist named Volta read the report and started investigations which led him to the invention of the electric cell and electric battery. The volt is named in his honour. (Galvani is commemorated by galvanometer, galvanism and galvanise.)
So, a voltmeter is called that because an Italian got curious about what another Italian noticed.
What is the difference between SCXI and PXI?
I work for National Instruments. NI is one of the companies that defined PXI. PXI stands for PCI eXtensions for Instrumentation. It is like the PCI bus, but extended. This means that extra connections are available to share signals between multiple PXI peripherals.
SCXI stands for Signal Conditioning eXtensions for Instrumentation. Signal Conditioning is the general term for the process of making a signal more useful by improving its precision, accuracy, or signal-to-noise ratio.
Think about a sensor/transducer such as a thermocouple. In order to get quality temperature readings, you need to amplify the thermocouple signal. You should also filter out high frequencies, because while noise is high-frequency in most environments, temperature changes almost always happen very slowly.
SCXI can also handle switching, and has some multiplexer's in the background so that a separate ADC can capture the conditioned signals.
So, to put these two together, a real-world signal from a transducer goes into SCXI, which might then send the conditioned signal into a DAQ board in a PXI system.
Another key difference is that a PXI bus directly communicates to an operating system on a computer, while SCXI only does things to signals and passes them on to DAQ devices.
