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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
When a shunt generator fails to build up the voltage then how to rectify the fault?
It fails to build up because self excited DC motor's armature have only one direction of rotation. So that if the poles of the armature are reversed, then this causes the reduction in the residual magnetism and eventually, it will stop.
The Mode is another word for the Average. This means that it is the number that is most likely to occur if you repeat the action that gave you the last numbers. To get the mode, it is pretty simple. You first add all the numbers together, and divide them by the amount of numbers you had to begin with.
Manufacturing date of onan gas generators?
The year is in the serial Number. Such as B84654773.
B is the month= Feb.
84 is the year.
Up until I think 1968 It was listed this way. 73B123456'
A was 1940-1949
B was 1950-1959
C was 1960-1969
So my example would be July of 1953
Which device among a pager a cellular phone and a cordless phone will have the longest battery life?
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A capacitor resists a change in voltage. The rate of change of voltage is proportional to current and inversely proportional to capacitance.
dv/dt = i/c
Put this in an AC circuit and analyze, and you learn that, as frequency goes up, capacitve reactance goes down; inversely, as frequency goes down, capacitive reactance goes up.
X = -1/(2 pi f C)
How to generate the forward-bias portion of the characteristics curve?
Build a dependent current source in the operating range of the diode in question. The 1N4148 (1N914), for instance, is a 75ma diode. I would build a current source capable of 0 to 50ma. Plot voltage versus current and then replot current versus voltage. Be prepared to plot on log-log or semi-log paper, in order to show the true nature of the curve. Also, be prepared to do several runs for several diodes, and also at several temperatures, because there are variations amongst diodes and also as a result of temperature.
For most accurate reporting, you should measure the diode's temperature during the test runs, because the higher currents will cause it to warm up and change its curve shape.
This would be a good example for a computer controlled test device. Sounds like a project to me????
A signal generator can be used to function in two ways. In high frequencies, one of output probes of any generator (negative probe) will be grounded automatically, hence it has to be connected with grounded parts of other elements not to create a short circuit problem. But, in the case of floating type (f<100 Hz, generally) probes of the signal generator is not grounded.
7.0w/4 = 1.75w
What are the two major differences between a mechanical switch and a transistor?
- speed
- size
- switch has moving parts, transistor has no moving parts
- switch contacts wear out from friction and/or electrical arcs, transistors don't
- etc.
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How many kwh are used by a 12 volt battery?
Every battery has a rated life in kilowatt hours or ampere hours. There is no way of knowing what battery you are referring to. To supply one 1000 watts (1 kilowatt) of energy at 12 volts, the battery must supply 83.33 Amps at 12 Volts. If battery supplied 83.33 Amps for one hour then 1 KWh would be the result.
Why the unit of potential difference and electromotive force is the same?
Because an electromotive force is a potential difference (voltage) -specifically, an electromotive force is the open-circuit or no-load potential difference of a source such as a battery or generator.
To what scale should the ammeter be set in order to read a current of 2000ma?
2000ma is equal to 2 amps. Set you meter to a current range ABOVE 2 amps.
What is the Technique used in resistors is coding or decoding?
If you want resistor color code, look in wikipedia electronics color code
What is the charging time for a 7.2 v 500 mah battery?
About 2 hours. Check every 10 - 30 mins as, it should get warm but not hot. If it gets hot then unplug as soon a possible.
What is the measure of resistance of a solid to being scratched or dented?
i dont know but it has 10 letters :) im doing a crossword for science and they asked that question but I cant figure it out
this is halohayd the answer is hardness
Why does a d-type flip flop need a transition gate on its clock input?
The D Flip-Flop takes the logic level of 'Data' to the output only on the rising edge of the clock pulse.
Without the transition gate: Since the clock pulse is a square wave (and is high for half a cycle, and low for the other half), the logic level at 'Data' could change while the clock pulse is high, causing the output to change before the next rising edge. This is not how a flip-flop operates.
The transition gate prevents this by converting the clock pulse into a very short 'blip' of a few nanoseconds, starting at the rising edge of the clock pulse, repeating on the next cycle. This means there is only a very small window where the clock is high, and the logic level at 'Data' can be taken to the output.
Pseudocode is code that is not specific to any architecture nor programming language. It is intended to be human-readable, not machine-readable, and is primarily used to demonstrate the operating principals of an algorithm in a high-level format suitable for any architecture and any language. The 8086 is a specific architecture, so any code produced specifically for it cannot be regarded as being pseudocode since it would have to be in a machine-readable form.
Derive an expression for efficiency of full and half wave rectifier?
The efficiency(n) of fullwave rectifier is defined as: n=DC output Power/AC input power But Power=V*I n=Vdc*Idc/Vrms*Irms But Vdc=2Vm/pi,Idc=2Im/pi ,Irms=Im/root(2),Vrms=Vm/root(2) (Im:Peak Curent) n=(4Vm*Im/pi^2)/(Vm*Im/2)=8/pi^2=0.812=81.2%. So efficiency of full wave rectifier is 81.2%
Why is voltage not expressed in milli volts?
Voltage most certainly can be expressed in millivolts. Milli is simply an prefix that means one thousandth. I have seem picovolts, microvolts, millivolts, volts, kilovolts, megavolts and teravolts in common use. Other prefixes are also valid.
What is rolloff in an op-amp circuit?
op-amp rolloff is an inherent low pass filter built into op-amp chips. Because op-amps have such a high gain, they are prone to breaking into high-frequency oscillation; therefore limiting the gain by frequency with a built in low pass filter helps stop this from happening.
Imagine a super small signal is leaking into an op amp, because of the high gain it becomes no longer negligible and we have a high frequency signal when the output should be zero. The low pass filter lowers the gain at these High frequencies.
Now, this will naturally create gain limits when designing circuits, forcing an upper bandwidth. This is adjusted for by lowering the gain you design into your circuit for the bandwidth you are dealing with (which is one of many reasons we build multi-stage amplifiers)
