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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
là loại tụ mà khi nó hư hỏng sẽ không gây ra bất kỳ sốc điện nào cho mạch điện. theo EN 60384-14 thì lớp tụ X được chia thành 3 lớp nhỏ tùy theo đỉnh xung điện áp mà nó chịu đựng và điện áp danh định. xung điện có thể gây ra tù sét hoặc chuyển mạch của thiết bị bên cạnh hoặc thiết bị (mà dùng chính tụ đó) gây ra nhiễu
vu_ld@yahoo.com
Accelerator Position Sensor. This measures the position of the gas pedal and is used by the ECM along with the Throttle Positon Sensor to control how much fuel is delivered to the injectors, along with a couple of other things of course.
The answer is the small greek letter eta: η See: http://en.wikipedia.org/wiki/Eta
In 1872, the "St.E.G" factories in Resita manufactured for the European railways: 16 crane travelling on rails, 18 water tower tanks, 110 plates for the return of the railway engine, 514 switch double crossing frogs, 793 cushions.
How do you run 3 phase motor on 1 phase system without a converter?
You really can't.
If you apply single-phase power to the motor, and start it spinning by hand, it will run, but you won't get near the rated horsepower out of it, and it won't start by itself.
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 a meter or voltage indicator
to insure the circuit is, in fact, de-energized.
What is a Tempil stick temperature measuring crayon?
These are temperature sensitive chemicals shaped in the form of sticks.
These are not temperature measuring but temperature Indicating crayons.
You have to interpret temperature by observing the physical change taking place
form solid to liquid.
A surface is heated & you start marking (or rather touching) at intervals.for example
you have a stick of 150oc with you.as soon as surface attains 150oc you will get
liquid droplets in place of dry chalky mark.
Kamal jain /Indore / India thermochalks@rediffmail.com
What is a Booster Transformer in Railway Engineering?
A booster transformer is a 1:1 ratio transformer. They are mounted on overhead line structures, with the primary side attached to the contact system and the secondary side attached to the return conductor. The 25kV voltage on the primary side induces a 25kV voltage into the return conductor which helps reduce electromagnetic interference with other electrical equipment namely signalling and telecomms.
In the UK there are two common types - breathable which were installed with the first major electrification program, and sealed which are used to replace the old transformers.
Manufacturers include Alstom and ABB.
Weights are in the 2800-3050kg range.
All transformers are oil filled.
One of the single core cables benefits is high current rating. The other benefit is that the operating temperatures of single core cables are least affected by the other cables.
is there an error if the upstream circuit breaker is 16A TP and the downstream circuit breaker is 16A TPN?
Why can some birds land on high voltage lines without getting shocked and and some can't?
To get electric shock, the circuit must be completed and the subject who is in the path, or who becomes the path gets shock. When a bird sits on the wire, there is no closed path or circuit hence it does not shock. Same bird while sitting on the wire, and part of its body touches the earth or ground it then will get shock.
Harmonics is multiple of fundamental frequency. Spurious is not related to fundamental frequency but it is observed at the output spectrum. Harmonics are generated due to non-linearity of the device. Harmonics can generate spurious. As an example harmonics can produce resonance with mechanical box internal structure and can generate spurious.
Harmonics generally generated from TCXO & frequency multipliers. If amplifier is non-linear, this will also generate harmonics. But harmonics very near to carrier generally generates interference to modulating signals. We design final power amplifier as a class AB amplifier to get more output power and better efficiency and also to minimize output power variation with temperature. Since it is non linear amplifier it generates harmonics but it will be very far from carrier and can be filtered easily.
See the link for detail :- http://harshit.org/spurious and harmonics.pdf
How do engineering mechanics relates to electrical engineering?
It really depends on what sub-discipline you choose to go into. For certain topics in EE, like microelectronics, or communications, there won't be a whole lot of correlation. For something like Power Systems, or Controls, you might see a little more.
For example, in controls, you may need to make an electronic control system for a mechanical device. In power systems, a good working background in mechanics may help if you get into the generation side.
Why you use 33kv for power transmission?
Power loss during power transmission is predominantly due to the current drawn, which heats the wires. Power dissipated is current x voltage and voltage is current x resistance, so in any wire with fixed resistance the power loss is proportional to the square of the current flowing. The higher the voltage you use to transmit the power down the distribution network the lower is the current, hence power is distributed at the highest voltage that is practical, then the voltage is dropped to the domestic level at the destination sub-station or by a transformer on the power line pole. Major distribution systems operate at over 100 kV, with regional ones at lower voltage.
Additional Answer33 kV (not 'kv'!) is the primary distribution voltage, not a transmission voltage, used in the UK. Other distribution voltages are 66 kV (not very common) and 11 kV. Transmission systems operate at 400 kV and 275 kV.
An EFT server is software that is used in the electrical engineering field. EFT is an acronym for enhanced file transfer.
What is the 3 phase generator capacity in KVA of load current of 17.1 amperes?
voltage=400 volts current=17.1 ampere assumed total load since IL=KVA X 1000x0.8/400 therefore kva=17.1x400/1000x08 =8.55kva Gen set
How does ignitor in sodium vapour lamp work?
Similiar to a flourescent light. The ignitor provides a high voltage potential to excite the sodium gas within the bulb.
What is the Location of medium voltage switch gear?
A medium voltage switch gear is on the low voltage side of the transformer. This medium voltage switch is very cost efficient as well.
(Mechanical Engineering) The manufacture of patterns as used to create a mould when sand casting. The pattern matches the shape you are trying to cast.
Which is more dangerous AC or DC?
I am not 100% sure but I think DC is more dangerous than AC.
Both are dangerous. It is difficult to put numbers on it, as there are too many variables which determine the amount of current which flows through you when you get a shock. There is only one safe course when dealing with electricity, and that is to assume it is always dangerous and always avoid touching anything live.
What is the relationship between current and resistance?
They are proportional to each other with a constant of 1/V, by rearrangment of the formula V = IR.
What are the advantages of High Voltage DC transmission over High Voltage AC transmission system?
A few, at least. There are probably more. First, since the frequency is zero, reactive losses due to cable inductance are eliminated. Next, possible health risks due to alternating magnetic fields are reduced. Also, the non-trivial problem of syncronizing two power grids is eliminated. The DC is syncronously converted back to AC at the receiving end's phase and frequency, without regard to the generating end. Another possible benefit (from my point of view at least) is that HVDC systems are, to my knowledge, almost always run underground, eliminating unsightly transmission towers and lines.
