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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
What is the number of free electrons and holes in a pure semiconductor at 0k?
There are no free electrons and holes in a pure semiconductor at 0k.
Can eddy current work through galvanization?
as far as i know eddy currents will work on any material as long as the material to be tested is conductive...and it also depends on the penetration to where its being applied
The lowest frequency of a signal is 10 kHz the highest frequency if 1 MHz what is the bandwidth?
BW = (1 MHz - 10 KHz) = (1,000 KHz - 10 KHz) = 990 KHz
If a current of 4.5 amps flows into a 3.5 ohm resistor for 5.5 minuits the energy dissipated is?
The power dissipated by a resistance ' R ' carrying a current ' I ' is [ I2R ].
I2R = (4.5)2 x (3.5) watts = 70.875 joules per second
5.5 minutes = (5.5 x 60) = 330 seconds
Energy = (power) x (time) = (70.875) x (330) = 23,388.75 joules
What do Probes attach themselves to?
Probes attach themselves to nothing.
Probes are attached by technicians to various points in a circuit that need to be examined to test a circuit.
Root-mean-square voltage in ac?
rms voltage will give the ability to predict how much work will be done by an ac voltage. the rms value of a pure sine wave is 0.707 times it's maximum amplitude.
As induced magnetic lines exist in a plane perpendicular to the direction of flow of current, the component in the direction of current i.e cos 90 component will be zero. Recall cos 90 = 0. Hence the answer
Vtop = sqrt(2)*Veffective
so Veffective = Vtop / sqrt(2)
Why fet operated in reverse bias?
you want to keep the channel electrically isolated from the gate (jfet) or substrate (mosfet) so that it operates as a fet, don't you? if it was forward biased it would just be a diode with no field effect.
What is the meaning of jitter?
Jitter refers to the variation in the time delay of packets being transmitted over a network. It can result in inconsistent data flow and affects the quality of real-time communications, such as voice and video calls. High jitter can lead to disruptions, causing issues like choppy audio or video. Managing jitter is crucial for maintaining smooth and reliable network performance.
What is small signal amplifier?
As the name suggests, it amplifies a small signal. It ususally has a very high input impedance, to avoid affecting the source signal.
Sinusoidal pwm generation using modulation index?
Not sure what type of modulation you are looking for, but there are two that can be manipulated, either individually or in conjunction:
Frequency modulation index refers to the relation between the sine wave frequency (sine_freq) and the triangle (or saw-tooth) wave frequency (triang_freq).
The frequency modulation index is equal to ((triang_freq)/(sine_freq)).
Amplitude modulation index refers to the relation between the sine wave amplitude (sine_amp) and the triangle (or saw-tooth) wave amplitude (triang_amp).
The amplitude modulation index is equal to ((sine_amp)/(triang_amp)).
Varying the modulation index (normally by varying the frequency or amplitude of the triangle wave form) changes that respective modulation index.
From personal experience, an appropriate amplitude modulation index for an SPWM waveform should be around 0.8(that is, if the triangle has an amplitude of 10, the sine would have an amplitude of 8). This index should never be equal to 1 (one); it should always be less. A.K.A.: the triangle-wave amplitude should always be greater than the sine-wave.
On the other hand, a triangle-wave frequency much greaterthan the sine-wave frequency makes an SPWM that in turn generates a "cleaner" synthesized sine-wave in the H-bridge you are probably using. Try different freq. modulation indexes, but an index of at least 10 should be used (preferably somewhere around 100 if you want a good SPWM). That is, if the sine-wave frequency is 60 Hz, the triangle-wave frequency should be above 600, preferably 6,000 or more. Complications in the filter design in the "output" of the H-bridge will vary greatly when playing around with the frequency modulation index. That being said, keeping the amplitude modulation index at a static 0.8, and playing around with the triangle-wave frequency should be your best bet.
Why is one need to turn off the circuit in between measurement when using the wheatstone bridge?
Removing the resistor that you are measuring while the circuit is still on, would create an excessive amount of current to flow through the galvanometer, possibly damaging it.
Is Fourier series used in power electronics to generate harmonics?
Yes, Fourier series can be used in power electronics to analyze and generate harmonics. By decomposing complex waveforms into their sinusoidal components, engineers can understand and manipulate the harmonic content of signals. This is particularly useful in applications like pulse-width modulation (PWM) for inverters, where controlling harmonics is essential for improving power quality and efficiency. Additionally, Fourier analysis helps in designing filters to mitigate unwanted harmonics in power systems.
According to Kirchhoff's Current Law, the sum of the individual branch currents must be equal to the total current before (and after) it branches.
What is live zero and dead zero?
its to differentiate d working and faulty of d instrument.
live zero-even when the i/p s zero,o\p has sme value..4mA..
dead zero-if d instrument s faulty,it wl show d real zero value..below 4mA..
std accepted value is 4-20mA..
When several signals can be transmitted at once it is called?
When several signal transmitted simultaneously. this is called multiplexing of signals.
many signal are combined into one and then they transmitted.
What is the purpose of a tone generator?
A major purpose is to generate test signals for troubleshooting purposes.
Sometimes they are also used for sound effects generation for plays, movies, radio dramas, etc.
