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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 si diode showing 0.7V difference in practical case?
has to do with energy levels in the atomic shells
Geranium is about .2V
Cu CuO2 diodes are used in analog meters they dont have a voltage drop
but are less efficient 75% or so ratio forward to reverse so on a line powered analog meter the low volt scale is a bit different from the others
digital meters gotta have external power anyway so so uses a diode backed with an op amp (hiQuality rectifier)
Where RC network is used in electronic and communication circuits?
Uhhh... the short answer is "everywhere".
What are the causes for the field failure in a dc shunt motor and how to troubleshot?
the field winding is just a single magnet
a single pole motor has two usually in series
to start the motor full voltage is put on the field
ok failure modes almost always insulation problems
water, metal chips short to ground
an overloaded motor can induce a reverse polarity in the field causing higher current or voltage (extreme conditions) this also reverses the tempory magnet in all the metal parts and can burn out the winding
to troubleshoot isolate the field put on an ohm meter check the resistance
nameplate will tell the current so 250V 1 a is 250 Ohms
if this in anywhere close there is probably an insulation failure
so find a megohmmeter sufficient to test the insulation
(minimum for 250v 2*250V +1000V or 1500V megger)
100s of megohms is probably safe and with the 1500v it will see any air gaps or pinholes in insulation.
dc is very unforgiving with arcing
if an arc gets started it wont stop until fuses blow
even enclosed motors have brushes and the carbon dust will get on the field windings so they should be cleaned OFTEN.
How a 1N4007 diode become a 1000V diode and 1N4005 become a 600V diode?
naming convention
as for manufacturing
for higher voltage thicker diffusion layer
after manufacture can test them to see which group they fall in
sometimes we get lucky and the whole batch is those 1000v diodes
but you dont want to waste the time in the diffusion oven if you only have 5v costumers
Why it is called as logic function generator?
this generator operates using logical function thats why is called as logic function generator
Capacitors come in various sizes, your question is to non specific (capacitor for WHAT) for a detailed answer.
Why does a thyristor have 3 legs?
neagtive leg a postive and a porducer i am doing electronics just leanred it.
north
What is the working principle of crystal microphone?
It is the same piezo electric effect, the vibrations caused by the sound waves are converted into corresponding electrical signals.
What is epabx how it works and what is main contents of EPABX?
EPABX stands for Electronic Private Automatic Branch Exchange.
EPABX is a telephone exchange that serves a particular office / institute or area, as opposed to one that a telephone company operates for many businesses or for the general public.
It make connections among the internal telephones of a private organization and also connect them to the Public Switched Telephone Network (PSTN) via Trunk lines. The general term "Extension" is used to refer to any end point on the branch.
To establish an EPABX network, main contents are:
1. EPABX Block
2. Tag Block
3. External Telephone Connection
4. Jack Panels
5. Face Plates
6. Telephone Setup
What is the digital pulse modulation?
There are 3 main types of digital pulse modulation:
- Pulse time modulation (PTM), somewhat similar to analog phase modulation.
- Pulse width modulation (PWM), the width of the pulse represents the signal.
- Pulse code modulation (PCM), serial transmission of binary bits forming numeric or character codes that represent the signal.
All of these can be modulated on an RF carrier using any of the standard modulation techniques: AM, FM, Phase Modulation, etc. One advantage with AM digital pulse modulation techniques over AM analog is that the carrier can be 100% modulated, which cannot be done with analog, thereby allowing significant reductions in transmitter power without loss of coverage range. Sometimes FM digital pulse modulation techniques are referred to as Frequency Shift Keying (FSK). A very complex method of combining Phase Modulation and AM to increase the bit density of digital pulse modulation on an RF carrier is called Quadrature Amplitude Modulation (QAM).
How do you Program an Allen Bradley PLC?
By using a programming terminal / pc/laptop with development software. For a control logix family of AB make PLC, install RSlogix5000 software on a laptop and connect to plc on its suitable port, say Ethernet.
Is it really possible to avoid reactive power in electrical circuit?
yes
AnswerNo, but you can counter its effects. For example, if your load is inductive, then you can counter the effects of its inductive reactance by introducing capacitors with equal capacitive reactance.
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Where can you get a powerful motor?
Depends on what you mean by powerful. How many horsepower? And are we taking about electric motors or petrol or diesel or turbines, or what?
Why rms voltage consider in ac network?
How do you realistically compare the 'speed' of a circular saw with that of a reciprocating saw? You can't do it directly, as they work in two completely different ways so, instead, you do it by comparing the speed at which each cuts through timber.
In a similar way, you compare an a.c. current with a d.c. current by comparing the work done by each current. If they both perform exactly the same amount of work, then you say that the a.c. current is exactly equivalent to the d.c. current. So, for example, 5 A (r.m.s.) is exactly equivalent to 5 A d.c.
Since voltage is proportional to current, the same applies to voltage. So 120 V (r.m.s.), for example, is exactly equivalent to 120 V (d.c.).
Unless otherwise specified, all a.c. currents and voltages are always expressed in r.m.s. values, and all measuring instruments indicate a.c. current and voltage in r.m.s. values.
For a sinusoidal waveform, the r.m.s. value is 0.707x the peak value.
What is amorphous semiconductor?
it is like p type semiconductor because when adding impurity its conductivity decreases
What is the function of a darlington pair?
A darlington pair are two bipolar transistors connected in series in one package the emitter of the first one is connected internal to the base of the second one the two collectors are common, where the second emitter is external, so that the current amplified by the first is amplified further by the second. This gives a high current gain (written β or hFE), and takes less space than two transistors in the same configuration. Integrated packaged devices are available, but it is still common also to use two separate transistors.
When does current carrying conductor placed in a magnetic field experiences a maximum force?
It experiences maximum force when it is placed perpendicular to the direction of magnetic field.
Can dc 5V 800mA works with 5v 2.5A?
When sizing power sources, you must match voltage (which you have done) and make sure the supply can supply enough current to the electronics. If your supply is the 800mA, and the equipment using this needs 2500mA, then the power supply is undersized. If the supply is the 2500mA and the user is 800mA, then your power supply is oversized, and will work just fine.
Will a 750w pioneer amplifier push a 1300w sony explode woofer?
Yes it will. I had it hooked to mine they hit hard
