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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
How do you remove coating on circuit boards?
That will depend on the type of coating used as there are many, some of which are trivial to remove whereas others cannot be removed without using means that irretrievably damage the circuit board itself.
However assuming you are referring to the common green varnish coating used on most commercial circuit boards, this can be removed with an ordinary paint stripper chemical that is effective on varnish and an acid brush. Just make sure to wash off the stripper residue with good quality circuit board cleaner (not water).
Why zener diode is called reference diode?
They are frequently used to provide a voltage reference in voltage regulators.
What you do to obtain perfect dc output with no ripple?
This can only be done using a voltage regulator.
Why you use capacitor in transistor amplifier in output?
The capacitor is used to block DC bias from the output, so that only the AC signal is passed. In an audio amplifier, for instance, unwanted DC in the output would cause distortion when fed to a speaker, or could even damage the speaker or amplifier.
In the case of interstage capacitors, they block DC so that the output of the first stage does not affect the bias of the second stage.
What is meant by 'OA' in OA79 and '1N' in 1N4001?
IN IN = 1N: Refers to the number of junctions (1N= 1 junction).
O= Germanium, A= rectifier diode, so OA = germanium rectifier diode.Why kirchhoff law are not applied to high frequency circuit?
They are, but you must correctly account for parasitic effects.
The equation you are looking for is R = E/I. The question wants to see if you know how to convert mA to amps. Do the conversion and then use the equation and you will have your answer.
What happen to the 480v rated motoe when connected to 440v power?
Depending on the design of the motor, it may just run with less torque/hp. It might run slightly hotter as well, depending on the load.
Why is a cascode current mirror better than a simple MOSFET current mirror?
In simple MOSFET current mirror, the load current does not follow a linear relationship with reference current (ie for short channel MOSFET's multiplying factor due to channel length modulation cannot be neglected). But by cascoding the output resistance can be increased and since output resistance follows an inverse relationship with lambda (channel-length modulation parameter), the multiplying factor due to channel length modulation reduces to one and a linear relationship is obtained between reference and load current.
Why does capacitance increase when the distance between the plates of a capacitor is increased?
you have it reversed. capacitance increases with decrease in distance of plates.
Is a UJT a voltage controlled or current controlled device?
voltage
Current between the two bases of the UJT sets up a voltage gradient in the semiconductor. When the voltage on the emitter of the UJT rises high enough to forward bias the emitter-base junction at the voltage of the interbase gradient where the emitter is located, the UJT "turns on".
Is it more difficult for current to flow through a circuit with two bulbs than with one?
yes because of bulb resistance :)
Which is better 89S52 or pic microcontroller?
There are many tradeoffs that must be considered to make a proper choice, neither is better in all cases.
However many projects just use personal prejudice (oops sorry, preference) to choose as they are lazy (oops sorry, it takes less work).
Impedience of electric circuit?
The impedance of an electric circuit is the measure of the opposition presented by a circuit when the current and voltage is applied.
Impedance of electric circuit?
The impedance of electric circuit refers to the measure of the opposition that a circuit presents to a current when a voltage is applied.
What is the time constant of a 47 ohm resistor and a 47 microfarad capacitor?
The time-constant is the resistance times the capacitance, so that's 47 x 47 and because the capacitance is in microfarads, the answer is in microseconds.
Which is better directly heated cathode or indirectly heated cathode?
A cathode to which heat is supplied by an independent heater element in a thermionic tube; this cathode has the same potential on its entire surface, whereas the potential along a directly heated filament varies from one end to the other. Also known as equipotential cathode; heater-type cathode; unipotential cathode.
Why do you prefer to implement basic gates through universal gates?
I prefer to purchase chips containing the specific gate needed in the circuit.
Implementing other types of gates from so calleduniversal gates is risky in actual practice as it often produces race conditions, especially when implementing exclusive or type gates from universal gates. This practice also usually uses more hardware and is therefore more expensive than using the right gates in the first place.
What are the benefits of using a cordless soldering iron?
The first benefit is that a cordless item is portable. Also most of the cordless irons are small. Another benefit of using a cordless iron is that the cord will not cause any trouble and not get in the way of ironing.
4.8 ohms
