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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
The 74xx series of integrated circuits use TTL technology. (Transistor Transistor Logic). They work on 5v power supply, and draw a larger current. The MC type chips are CMOS. (Complementary Metal Oxide Silicon) they work off a more varied voltage range, 5v - 18v and draw less current than TTL. Other different numbers will relate to the package design and speed of operation.
The only breakers that allow any adjustment at all are usually three phase and used on motor starting. These types of breakers have overload rated trips installed into them. The breaker has to be sized by code to 250% of the motors full load amperage. The adjustment is in the time that the breaker will hold the 250% overload before tripping. The draw back is that the longer the time for the motor to start, the quicker the motor will heat up. It is the prolonged heat that finally destroys the insulation on the motor's winding and will finally lead to a shorting of the windings to ground or to themselves.
How do you design a transformer with three phase 400v input and single phase 2000v output?
By design are you going to wind the transformer yourself? In your design you need a 5:1 ratio. On the output side of the transformer any two legs of a three phase transformer is considered single phase voltage. Good luck on your project.
Difference between lumen's and ANSI lumen's?
Both are unit of brightnes and usually shows numerical value of brightness in projector. lumen is measering unit of each pixel which generates by light source .it tallest brightness away from centre and other mansion is equally distributed cause of generated by led .
How do you modulate audio sound into FM?
Walmart and Radioshack sell FM modulators. these are mostly used to send audio from a I- POD or other device to a FM car radio tuned to the frequency of the modulator, some are switchable to avoid the frequency of any local FM radio station. For use at home get a power supply to power it from a wall socket. Some are stereo and some are mono.
Since there is an AC to DC converter in there, it's hard to say. If it's a basic transformer to rectifier to capacitor design it will put out 6 volts. If it is a transformer to a voltage regulator it's hard to say what will happen. Certainly the drive voltage to the regularor will be cut in half. It may or may not run, but won't be able to run at 12 volts because there won't be any 12 volts to drive the regulator. (There will only be 6 volts.) If it is a switcher it may work fine or it may do nothing.
Explain the major difference between combinatorial logic and sequential logic?
It was mentioned that there are two different ways to connect two or more electrical devices together in a circuit. They can be connected by means of series connections or by means of parallel connections. When all the devices in a circuit are connected by series connections, then the circuit is referred to as a series circuit. When all the devices in a circuit are connected by parallel connections, then the circuit is referred to as a parallel circuit. A third type of circuit involves the dual use of series and parallel connections in a circuit; such circuits are referred to as compound circuits or combination circuits. The circuit depicted at the right is an example of the use of both series and parallel connections within the same circuit. In this case, light bulbs A and B are connected by parallel connections and light bulbs C and D are connected by series connections. This is an example of a combination circuit
By Engineer
Muhammad Zaheer Meer GMS
What are general problem of mobile ip regarding security?
One security issue in the use of smartphones, and therefore mobile internet, is that of malware. As there are so many applications available, the user should apply the same security measures as they would use on their home computer.
What is a polarized semiconductor component?
A: A diode a capacitor even a transistor must be connected to the the power as a polarized components
What is closed circuit air conditioning?
Closed Circuit Air Condition, known as CCAC as well... It's used in Data centers
voltage is still 1.3V
in parallel circuit, voltage stays the same but current adds up
in series circuit, voltage adds up but current stays the same
What is the verdict of R. v. Clow?
Second degree murder, but it was appealed. The final verdict was manslaughter.
Will a hair dryer suck instead of blow if the fan blade is turned around?
A: That will be true ONLY if the blades have a pitch to it
What are some wireless communication systems?
Wireless communication systems include pagers, cellular phones, personal communications systems
What is the code for a 500 resistor?
A: That is not a standard value therefore there is no code for it. the closest value will be 510 ohms and the code will be 5 green brown1 and brown again for the multiple of 1 for a zero. 510
Grounding terminals are used to connect the electrical equipment or wiring system to the Earth. It's purpose is to reduce the risk of electrical shock in the event of a fault current. In most homes, the wiring system is permanently grounded to a metal pipe that connects to an underground water-supply system or to a metal rod that has been driven into the ground.
What cause high reflected power in transmission line?
Poorly matched terminating impedances will result in high reflection. Tuning networks on both ends are used to tune the source and load to the same impedance as the transmission line.
What are the features of helical antenna?
the features are :-1.It has a wide bandwidth
2.Easily constructed
3.Has real i/p impedence.
4.Can produce circularly polarized field.
no, the transformer is much more efficient
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HOWEVER- a transformer only changes the voltage of AC current- it does not change it to DC. You will still need diodes or rectifiers. You can also use a motor/generator- a 230v AC motor turns a 12 v DC generator.
In the circuit shown if the value of the reactive component was increased?
if the value of the reactive component was increased, how would it change the waveforms?
Putting capacitors in series and then applying a DC voltage to them is not entirely useful. The voltage will cause a small current to flow into the capacitors, charging them to a total cumulative voltage of 200V. No further current will flow. If a meter is applied to one of the capacitors it's charge will cause a voltage measurement but it will quickly drop as the current flowing into the meter discharges the capacitor.
What is a super luminescent diode?
With their emission properties Superluminescent Light-Emitting Diodes (SLEDs) are closing the gap between Laser Diodes (LDs) and Light Emitting Diodes (LEDs).They offer the broadband optical spectra of LEDs and the spatial coherence of LDs. Compared to Laser Diodes and LEDs, SLEDs can be understood as • Spatial coherent broadband laser diodes with a beam-like output
• Temporal incoherent laser diodes with a broadband spectrum
• Speckle-free laser diodes with a short coherence length
• Spatial coherent LEDs with a beam-like output
I am assuming that your batteries are 12V, also that your (12V - 240V) inverter is rated for 5KW output and it is about 95% efficient. Most big inverters are between 85% - 97%. 5KW from a 12V battery would mean a current draw of about 416A, but since the inverter is only 95% efficient the actual current would be closer to 438A. If you draw 438A for two hours, that's 876AH. Theoretically then, you would need 9 100AH batteries. The problem is that at very high current draw, all batteries AH capacity is less than the rating. You only get the whole 100AH if the current draw is 10A (1/10th the AH rating) or less. Because of that, you would probably need 10 to 12 batteries. If you used 10 batteries, each would source about 44A during full load. You would have to use very large bus bars to equalize the current draw from battery to battery. If the interconnects are too small, the batteries closer to the inverter would be forced to supply more than their equal share of the total current draw, and the ones further away less. It's generally problematic to parallel large numbers of batteries in this way. Don't even consider it unless the batteries are identical (same manufacturer, same part number, same age, same date code). The problem gets even worse when you try to recharge the pack. Suppose you pump 50A of charging current into 10 batteries. Is each battery receiving 5A? Or is one battery with a shorted cell drawing all 50 (and is about to explode...)? There's no way to tell. Even if all batteries were receiving equal charge, it would take your 50A charger almost 40 hours to recharge 10 - 100AH batteries. Ouch. Large industrial UPS systems get around this by using huge 2V cells in series. You can buy 6 - 2V, 1000AH cells, connect them in series to form a 12V, 1000AH battery and avoid all the hassles of parallelling 12V, 100AH batteries. They are not cheap, though. If you go to a battery manufacturer's website, they publish graphs for their batteries that show AH derating versus current draw. All this assumes, of course, that your load is really 5KW. If you are running a smaller load, then obviously your battery count would go down. Finally, we are talking extremely large current and power levels here. If you are not fully qualified to understand and design high current wiring systems, don't try this! 400A of current through a bad connection can do serious damage! Unless you enjoy being sprayed with molten metal from a disintegrating connection, know what you're doing or get a qualified individual to help with/inspect your work. IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS. If you do this work yourself, always turn off the power
at the breaker box/fuse panel BEFORE you attempt to do any work
AND
always use an electricians test meter having metal-tipped probes
(not a simple proximity voltage indicator)
to insure the circuit is, in fact, de-energized.
