0
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
Are vacuum tubes used in technology today?
Yes! Radar and lasers, not to mention some forms of Strobe Lights use specialized variants of Vacuum tubes, as do older Television sets still quite active. Tubes are preferred by many old Hams for nostalgic and historical value and they had and continue to have a variety of industrial applications One man's obsolescene is another's practical value, It's like typewriters or manual 35 Cameras. Tubes had a huge variety of applications including of all things compositor machines, Volt-ohmeters by RCA confirmed by 1959 Manual, and possibly the older forms of Rotary-dial phones and of course radios, television sets, tape recorders, code oscillators... They have a past-and a future but mainly the (Living history) angle though quite practical. The Russians still use them for Radio communications and Sonar systems.
Vacuum tubes (especially triodes, tetrodes, and pentodes) are still the most popular form of amplification in guitar amplifiers, because of their unique tonal characteristics, and the distortion they produce when pushed past their limits.
Vacuum tubes have a lifespan, so they are needed to fix tube amps.
Every microwave cooker contains one vacuum tube called a cavity magnetron that generates the microwaves to cook your food. These tubes are the least expensive power microwave oscillators there are, thus their use for cooking.
An ammeter consists of a coil with very low resistance. when electric current flows through the coil, the coil induces a magnetic field which turns the needle.
A thermister is a resistor that depends on tempature, the higher the temp the lower the resistance t, the lower the temp the higher the resistance
A surge resistor is a resistor installed in a circuit to prevent a "surge" when conditions arise where a surge might occur. That might be a bit wordy, but that's the answer. Let's look at an instance where a surge resistor is used and see how it works.
There are a number instances where energizing a circuit is followed by a surge of current. Like almost all the time. When that circuit "comes on" after the switch is flipped, current is flowing. And sometimes we need to place a resistor in series with the component or components that want to draw a ton of current on startup. We can look at a component that might just do that.
Capacitors (caps) are sometimes fitted with something that limits a big shot of current when a circuit is energized. Caps, you recall, begin operation in the circuit of a modern equipment uncharged, and when these caps are first "seen" by the voltage source at the moment it's turned on, they look like a short circuit. Lots of current may want to flow. Jumping ahead, the cap sits in the operating circuit fat, dumb and happy "using" only a little current after things are going. But at startup, it needs to be checked to prevent it from "sucking up" (or sinking) too much current and overloading the supply. The surge resistor is on the job each time the circuit is energized.
There are other applications for a surge resistor, but the purpose is the same - prevent "too much current" from flowing at a given moment so the circuit can transition into a "normal operating mode" (where current flow is more modest).
The surge resistor is similar to a so-called current limiting (or, perhaps, ballast) resistor, but the name applied to the resistor in question might have more to do with the specific application.
What is the difference between a passive transducer and an active transducer?
Passive transducers - require an external power to operate, and the
output is a measure of some variation in passive components (e.g. resistance or
capacitance)
Examples of passive transducer :
-Slide-wire resistor
▫ Resistance strain gauge
▫ Differential transformer
Active Transducers - Self generating type - do not require an external power,
and produce an analog voltage or current when stimulated by some physical form of energy.
▫ Thermocouple
▫ Photovoltaic cell
▫ Moving coil generator
Can you kill someone with a pencil?
Yes YOU can.... by stabbing them in there neck!!! but dont do it = (
Most probably, it won't even run or it will run for a while and then burn out, a motor that run 700rpm is an 8 pole induction motor, the only way to get it to run slower or faster is to change the supply frequency, say you want it to run at 350 rpm you have to change the supply frequency from 50Hz to 25Hz
Does sound have to be converted from digital to analog for a computer?
No. Sound has to be converted from analog to digital for use by a computer, not the other way around. It is converted to analog so amplifiers and other analog equipment can use it and so you can hear it.
Compare binomial array with chebyshev array?
chebyshev has less side lobe level compared to binomial arrays
Is there any automatic car turn signal system?
Like an automatic indicator? If that's what you mean, you already have one in your car. The indicator will turn off when you have finished turning. It shouldn't take much to change it so it activates when you start turning. However such a device would not be practical (or safe) for use on the roads, as it would not give enough prior warning to other drivers.
What is the Role of engineering drawing in electronics engineering?
Electronics engineering mainly deals with things like power,machines etc. And role of engineering drawing in electronics engineering can be defined as for making blue prints of the model.
Examples of Double SideBand and Single SideBand applications Elaborate your answers?
Explain the difference between the various forms of a.m & f.m and which jutifies the radio station's choice of modulation for each waveband?
As the corrosion increases the resistance, and batteries are designed to give a specified voltage to the circuit attached to it, hence if the resistance across the terminals of battery increases thn the voltage drop across the terminals of battery will increase, causing a decrease in voltage supplied to the external circuit, which is undesire-able. Hope u got the answer :) ---- Corrosion allows atoms of energy to drain off through the frame. If the battery is not a newer one it will go dead soon. Corrosion is the wrong term oxidation of metal is what occurs when electrolyte leaks. WHEN that is evident then the additional resistance induced will limit the current output. Basically reduce the efficiency of the battery as a source of power. ----
Why is corrosion undesirable in a battery?
The deposits resulting from corrosion create an impediment to the flow of electricity.
Digital multi-meter (DMM) test procedure:
- Equipment Requirement - DMM with diode check mode and battery voltage less than 20V. (Typical units using 9V battery are OK).
- Collector-Emitter Junction test:
- With the module out of circuit remove the conductive foam and short the gate to emitter.
- With DMM in diode check mode, the collector to emitter should give a normal diode reading with positive on the emitter and negative on the collector.
- The DMM should read open or infinite with positive on the collector and negative on the emitter. Damaged IGBTs may test as shorted in both positive and negative directions, open in both directions, or resistive in both directions.
- Gate Oxide test: With the DMM in resistance mode the resistance from gate to collector and gate to emitter should read infinite on a good device. A damaged device may be shorted or have resistive leakage from gate to collector and/or emitter.
Advantages of single step index fiber over multimode step index fiber?
The single step fiber mode tolerates high powered laser use and a high bandwidth in comparison to the multi-step which only allows for non-coherent light sources and lower bandwidth.
Can you explain how to connect a type 7812 voltage regulator ic?
A Type 7812 voltage regulator ic (integrated circuit) is 3-terminal device with separate pins for Input, Output and Ground.
Basically you connect a suitable source (a battery or a power supply unit that plugs into the house's main electricity service) to the Input pin and the Ground pin. Connect your load device (the equipment which requires a regulated voltage) to the Output pin and the Ground pin.
You can find circuit diagrams for using this type of voltage regulator IC in electronics textbooks and often in the catalogs produced by suppliers of electronic components.
For technical and licensing reasons circuit diagrams cannot be included within the answers on this site.
The Related Link shown below gives detailed information about the ic itself, including its own internal circuit diagram.
Why even harmonics are not present in push pull amplifier?
Symmetrical push/pull circuits must cancel even ordered harmonics, like f2, f4, f6 and therefore promote odd ordered harmonics, like (f1), f3, f5 when driven into the nonlinear range.
The first person to create a model electric car was Anyos Jedlik in 1828. The first electric car which was able to be driven practically was invented in 1884 by English inventor Thomas Parker.
What are the DCT DWT watermarking techniques Explain it from its roots?
DWT has excellent frequency spread, spatial localization and multi-resolution characteristics. DCT offer compression while DWT offers scalability in watermarking. These techniques and properties are used in a combined DCT DWT watermarking technique.
There are many ways to form contacts with the people who live around you. You could volunteer in the community.
What is frequency sensitivity?
the amount of frequency change in the carrier frequency per unit amplitude change in the message signal is the frequency sensitivity
this term comes in the frequency moulation
