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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 is common emitter is greater than common collector?
Common-emitter gives more voltage gain because a common-collector amplifier has a voltage gain of 1. But a common-collector can have a power gain because the input impedance is much more than the output impedance.
How does emitter current is equal to base current and collector current?
Now, IE = IB + IC.
Alternately, current "enters" at the collector and the base, and "exits" at the emitter.
Now, IE = IB + IC
false
How are series circuits utilized in a schematic diagram?
Nothing is utilized in a schematic diagram, a schematic diagram is just a representation of something at a conceptual level. Only the actual thing, in this case an electronic circuit, utilizes anything.
How do you convert voltmeter to ohmmeter?
First you will need a constant current source. Do NOT connect the voltmeter to the constant current source without the resistor to be measured already connected. Do NOT use a battery, it is a voltage source. Then follow these steps to measure a resistor:
- connect the voltmeter across the resistor to be measured
- connect the voltmeter-resistor combination across the constant current source
- read the voltmeter and record the voltage
- disconnect the voltmeter-resistor combination from the constant current source
- disconnect the voltmeter from the resistor
- calculate the resistance from the measured voltage and current from the source with Ohm's law in this form: R = V ÷ I
Why you use 250 Ohm resistor in series with HART protocol communication?
You need to use the 250 Ohm resistor in series with HART protocol communication because it acts as a shunt resistor.
What is the total capacitance of 30 micro-farad capacitors connected in parallel?
In parallel, add the microfarads.
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.
Can a zener diode be used in place of ic 7805?
no, zener diode regulators can supply no more than a few tens of milliamperes to a load while maintaining stable regulation. a 7805 three terminal linear regulator IC is designed to provide up to 1 ampere to a load while maintaining stable regulation.
Note: three terminal linear regulators like the 7805 already contain an internal zener diode acting as a voltage reference, but its internal load is only 1 or 2 milliamperes to keep it very stable.
A possible/probable unit is Watts.
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.
4.12A. V=IR
4.8 ohms
What component is under the fan and heat sink?
A central processing unit (CPU), is under the fan and heat sink. The processor creates a lot of heat as it works, and would soon burn-out if not cooled.
What value of power is dissipated by a 5 k ohm resistor when 30 mA flows through it?
first need to find the voltage value to calculate the Power Dissipation. Because
P= I*V
Here V = IR
in given value
I = 30 m A = 0.03 A
R= 5 K Ohm = 5000
V= 0.03*5000=150
V= 150 V
Power dissipation
p= 150*0.03=4.5 Watt
