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Electrical Engineering
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.
23,056 Questions
What do you do when no current is coming to the coil?
Turn the power supply on. Then check all connections.
What is the function of fans in transformer?
The function of fans in a transformer is to regulate the transformer's temperature.
What is the cu cable size in 400a load?
A 0.15Cu cable has a rating of 382 amps summer and 476 amps winter. 0.2Cu allows 425/530 amps. That is for outdoor use in overhead lines.
What is the role of center trapped transformer in full wave rectifier?
centre tap transform convert ac into full wave rectifeir dc .It needs only two diodes but efficiency is less.
Where can use voltage of 415v 11kv 66kv 33kv and 132kv?
These are the nominal voltages used by the UK's distribution system, although (to comply with European Harmonisation requirements, 415 V has now been 'replaced' with 400 V. Incidentally, the symbol for the volt is a capital 'V', not a lower-case 'v'.
Why core losses are called as fixed losses?
Core losses, also known as fixed losses, are termed this way because they occur in the magnetic core of transformers and electrical machines regardless of the load applied. These losses, which include hysteresis and eddy current losses, are constant and do not change with variations in the operational load. Since they are inherent to the materials and design of the core, they must be accounted for in the overall efficiency and performance of the electrical device, making them predictable and unavoidable in operation.
You should look at the transformer vector diagram, or the type of transformer will tell you (something like YnD1, for example). If it's a Y/Y type transformer, the phase angle will be zero. If it is a D/D, it will be zero. If it's a Y/D, or D/Y, it could be +30, -30 (usually). I have seen a few strange cases where a Y/D was +150 degrees.
What resistor do you use for a 12 ohms if 1 amp goes through?
You need a resistor rated to dissipate 12 watts (P = I^2 * R).
You may be hard pressed to find locally, I would suggest using www.mouser.com. There is a part 280-CR15-12-RC (15 watt, 12 ohm 5% resistor) for $.63 (US). Mouser has a lot of parts, this is just the first that popped up in my search, so you should be able to find whatever you need (I use this site when prototyping).
Genaral means like what your interested in. Like have you ever heard anyone say I'm GENARAL in coloring or I'm GENARAL in dancing, singing you know what I'm prob talking about.
Notez: for more info call- 631-727-1107 thank you
.205 watts or 205 mw
Illusrations of common wire splices and joints?
You can splice wires together in many ways. You can solder them together and then tape them up or use a shrink insulator that shrinks by heating it up. You can strip the wires back about 1/2 inch and then twist them together and put them under a wire nut. Wire splices in a home must be spliced together inside a junction box with a cover. Wires can never be spliced behind a wall. Any splice should be placed where you can access it later on.
A 'non-ohmic' conductor is one that does not obey Ohm's Law -i.e. the ratio of voltage to current is not constant when the voltage across it varies.
Does the fuse on the primary side of a transformer protect the secondary side?
Yes, but it's usual to have fuses on both sides of the transformer.
What are the two types of electric circuits?
parallel connected and series connected circuits.
AnswerIn terms of connections, there are, in fact, four types of circuit. These are:
- series
- parallel
- series-parallel
- complex
'Complex' circuits are circuits that do not fall into one of the other three classifications, e.g. bridge circuits, and which can be solved using circuit theorems, such as Thevenin's, Norton's, etc.
What is the use of check zone in bus bar protection?
It provides stability in case of problems with disconnectors auxiliary contacts (stuck contacts or wiring problems). Ir relies on the feeder currents in the busbar.
Disconnectors positions are not required.
There is no selectivity using check zone. It's usefully because it prevents external faults to be considered as a busbar fault.
How can you increase your finger length?
It used to be a corrective surgery but is now cosmetic.
They could do the same with arms and fingers.
Bone is separated then a brace is used to slowly separate the bones as new bone grows in the gap. Post op is 1 week in surgery.
What AWG cable for 200' x 208 volt three phase 250 amp circuit?
A wire size of 250 MCM will limit the voltage drop to 3% over a distance of 200 feet.
How one million watts is supplied by megger?
It doesn't. Megger is a company name, and is used short hand for a certain type of power supply - kind of like klennex.
How is a 380v 3-phase machine to a 208v simple phase outlet possible?
if you wound 3-phase on primary of transformer and secondary side we have to only one cable only such a way that it works as a step down transformer.
AnswerYou cannot run a three-phase machine directly from a single-phase (which is what I assume you mean) supply. It won't start. The voltage difference is irrelevant.
