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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 diode dose not allow to set voltage more than 0.7volts across it?
The barrier potential of the silicon diode is 0.7v if the applied voltage across it is more than this voltage then PN-junction of the diode breaks, once pn-junction breaks the voltage across the diode is constant, since it breaks at 0.7 this voltage will be constant and not exceed for any further increase in applied voltage
-inform.mayaprasad@gmail.com
The voltage across junction will only exceed from 0.7 volt (for silicon diode) in the case of reverse biasing the applied total voltage will appear across p-n junction.
ANSWER: .7 VOLTS is an arbitrarily chosen number since a diode any diode have an exponential curve V vs I . This number is chosen when using a diodes but there are times when a greater or lesser voltage is chosen to reflect the application and the current trough the diode determine that. Example a diode gate diode will be chosen as .6 volts rather then .7v and a heavy conducting rectifier may have .8 volt to reflect closely the true value of the diode drop during real conditions
What is theory of brake test on dc shunt motor?
Brake test is used to determine the efficiency of comparatively small motors. The motor is loaded directly by means of a mechanical brake (load) or by means of an eddy current or a calibrated air fan.
What is the difference between electrical devices and electronic devices?
Electronic devices works on low level dc voltage like 48volts and less than that. We cannot give direct line supply to electronic devices, for this transformer is used to convert ac voltage to required dc level...
Whereas in electric devices we can use direct line supply (110V/220V) ac. These devices can also be operates on dc volts but greater than 48volts
What is the junction voltage drop a silicon diode?
It is generally accepted to be approximately .7 volts.
High voltage and low resistance would cause high amps. E = I R or I = E/R. PS E would be electromotive force measured in volts. R would be resistance measured in ohms. I would be current flow measured in amps.
What kind of circuit allows a current to flow through?
Any complete circuit.
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An electrical circuit.
Can you use a train transformer to power a cb radio?
For any power supply application you hav eto measure the supply specifications with the load specifications.
If the supply is AC the load should be designed to use AC and the same for DC to DC.
The voltages should match up.
The current that the load requires must be less than or equal to the current that can be provided by the supply.
Lastly the wires connecting the supply to the load must be sized to carry the current required by the load.
What is the function of a filter capacitor in a power supply?
A: The function is to change the pulsating DC into a smooth DC by removing the peak changes. The results are very little AC variation riding on top of the DC value or simply referred as ripple.
What happens if you remove emitter resistor in RCcoupled amplifier?
what happens if we remove Rc in RC coupled amplifier
What is the main difference between a bridge rectifier and a full wave rectifier?
Both the bridge rectifier and the full-wave rectifier achieve the same thing. They rectify the AC input on both opposing phases so as to minimize ripple time and voltage.
The difference is that a bridge rectifier consists of four diodes arranged in a bridge, so the input needs to only be single phase AC, while a full wave rectifier consists of two diodes, but needs a split phase AC source, such as provided by a center tapped transformer winding.
Also, the bridge rectifier presents two junction drops in the output, because there are always two diodes in series, while the full-wave rectifier presents only one junction drop in the output, because there is only one. It is a trade-off.
What type of circuit will produce brighter lights is it series circular direct or parallel?
Parallel connections will draw more current than equivalent lights connected in series, so the parallel configuration will be brighter.
What voltage ratio does the gain represent if an amplifier has a 30 dB voltage gain?
20*log(x) = 30dB X= voltage ratio output/input Therefore X = 31,7
How do you prevent arcing in electrical contacts?
Arcing is caused by current trying to sustain its flow by using the air as a conduit. If the travel is very far the arc will dissipate as lack of paths. If the current is great it may sustain itself. All contactor have a biult in shoot trough to channel the energy harmlessly, A capacitor across the contacts can help by absorbing the difference in voltage when the contacts disconnect or connects
What is the different between electronic and electronics?
"Electronics" is an engineering discipline or field of study or endeavour, as in "I Studied Electronics at MIT".
"Electronic" is an adjective, as in "Electronic Calculator".
An engineer working in this field can be described as either an "Electronics Engineer" or an "Electronics Engineer".
How program and data memory fetches can be overlapped in a Harvard architecture?
In Harvard architecture, the program memory space is distinct from data memory space. Such architecture requiring two connections. It can perform instruction fetch ( from program memory ) and data memory fetch simultaneously , by adopting a pipelined instruction execution approach, as shown below.
A typical instruction execution consists of performing Fetch instruction, Decode instruction, Fetch operands, execution operation , store results. Then, by adopting a pipelined approach, which is possible in Harvard architecture, it is evident that the instruction throughput increases by overlapping. It is simple to imagine that in the above case, if all the above states are executed "one after the other" , the execution time of the instruction will be longer than when it is pipelined.
What are the limiting values of a PN junction Diode?
A: heat
And PIV(Peak Inverse Voltage) or so called Peak Reverse Voltage is limit the diode characteristics.
What is cutoff region in transistor?
The cutoff region is when the transistor doesn't have sufficient base current to drive a larger current from emitter to collector. Therefore, the transistor does not turn on and stays shut off.
Which is faster to discharge or to charge a capacitor?
It depends on the amount of current available to charge or discharge. On the surface, I would say that you can discharge a capacitor faster than you can charge it, because the charge rate is limited by the current available in the power supply, while the discharge current could be quite high, because you could just apply a short circuit conductor around the capacitor. Of course, this could damage the capacitor. In truth, the equation of a capacitor is...
dv/dt = i/C, which means that, given the same charge or discharge current, the rate of change of voltage would be the same.
AnswerThe time taken to fully charge, or to fully discharge, a capacitor is given by the equation: time = 5 CR, where C represents its capacitance, in farads, and R represents the resistance of the circuit supplying the capacitor, in ohms. By 'fully charge', we mean bring the potential-difference across the capacitor's plates to the same value as the applied potential difference.
If the external voltage source is replaced with a short circuit then, providing the resistance of the circuit hasn't changed, the discharge time will be exactly the same as the charging time. If the resistance is changed, then the same equation applies, but you need to insert the new value of resistance.
MOSFET is Metal Oxide Semiconductor Field Effect Transistor.
IGFET Insulated Gate Field Effect Transistor.
But these expressions are practically synonyms.
Why is air gap is necessary in particle magnetic circuits?
Mainly air gap is necessary in magnetic circuit for two necessary reasons:
1. to prevent saturation
2. to allow an object to move in the magnetic field
