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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
so far i knew, the transformers are used to seprate dc component from ac component of supply fed into primary winding of coil. still if dc output value of ac input has to be calculated then it is v2*2/sqrt(pi)
where v2 is peak ac output voltage and is equal to v1*n2/n1
pi is a constant numerically equal to 3.14
thus the dc value is average value of output ac voltage
-------------------sachin_the_rex@aol.in------------------------------
What happens if a compressor motor locks up?
Air conditioning compressors that sit unused for a long time or run low on oil may lock up. The moving parts in the compressor motor will become tight and hard to move.
compensation of load by connecting a compensating device which adjust the real and reactive power in the distribution side or load side.
Cable size for 100kw 3phase with 175meter length?
2.5 mm twin and earth should do the trick.
A 100 kw @ 400 V, 50 Hz,3 Phase at a power factor approximately 0.8 will draw a current ( 100x1000/root 3x400x0.8 )=180.42 A. Breaker rating to be 200A TP MCCB and cable size to be minimum 4 Core 120 mm2 .
Volts peak is equals to dc volts?
"Voltage peak" is generally used to denote the maximum(amplitude) of AC voltage supply. It can not be approximated as dc value. The closest approximation one can make for dc value of a ac supply is the RMS(root mean square) value of the voltage. So that the ohmic loss caused by the given AC voltage supply is equivalent to that caused by a dc supply having value equal to the RMS of this AC supply (for given impedance & time).
What are the 20 best electrical and electronic engineering European universities?
You ask a bit much.
The English language master program at TU Dresden in organic and molecular electronics is certainly outstanding. It's a so called German "university of excellence", widely called elite university within Germany, and Dresden represents Europe's biggest cluster of microelectronics. It's ahead in material sciences.
The "CHE University Ranking 2012/13" sees TU in the lead among German universities in electronics and information technology.
15 uses of cathode ray oscilloscope?
five possible uses :
* Calibrate an oscillator
* Compare two frequency generators
* Phase shift determination b/w V and I in any CR circuit
* study Beats phenomenon
* study Lisajjous figures
Define electrical conductivity?
Conductivity is the inverse of resistance. Since Ohm's Law states that current is voltage divided by resistance, it also states that current is voltages times conductivity.
Dependency Load is a portion of the population that is not in the work force; Total people under 14 and over 65.
The forward voltage of an LED is the voltage that must be applied across the leads of an LED, anode to cathode, in order for the LED to function and turn on.
The total KVA is: KVA = (amps * volts * 1.73) / 1000 for a balanced load (which you have). So: (4 * 400 * 1.73) / 1000 =2.77KVA Note that you can only calculate KVA with the info you have provided. To calculate true KW, you have to know the power factor of the load. If you can determine the power factor, multiply the answer by PF to get KW. For the above to work, the PF has to be a decimal value (like 0.85 or 0.63, etc). If the listed PF is a percentage, like 85%, convert it to decimal (85% becomes 0.85, etc.). Oh, and panels don't draw current, they supply it. Loads draw current.
The resistance of a copper conductor will decrease with an increase of applied voltage?
No, the resistance of a copper conductor does not vary according to applied voltage. It is constant for a given wire size, and only varies with temperature. Of course, current through a conductor causes it to heat, so current, not voltage, indirectlycauses a change in resistance.
What does a transducer look like?
A transducer will take different appearances depending on the specific type. This is an electronic device that is used to convert one form of energy into another. A good example of a transducer is a microphone.
What letter represents voltage?
i think it is symbolised with a capital 'e' or 'v' :P hope this helped! :L:L
What is third harmonics in ac circuits?
It depends on the frequency in the expression of the function. A third harmonic would mean that the frequency is 3 omega, thus the circuit will consist only of the quantities that have 3 omega in the expression. For example if you have :
e(t)=5sin(3ωt+π/4) and is(t)=7sin(ωt+π/4), in the first harmonic the e(t) quantity
will disappear from the circuit while in the third harmonic the is(t) quantity will be neglected.
What is meant by unity coupled transformers?
The windings are wound as a pair, two wires next to each other. Same start point and same end point. In parallel, another words. They both share the same axis point also so the EMF is balanced as near to perfect as possible. The share the same EMF path when the electrons are changed into magnetism and then back to electrical current, hopping from the primary to secondary windings.
A phase current is the current passing through a phase, whereas a line current is the current flowing through a line.
Is an electronic engineer the same as an electrical engineer?
It depends on country, school/education, etc. In some contexts, the two terms are synonyms. In others they have different meanings. In general:
- Electrical Engineers deal mostly with big machines, motors, power lines and power transmission, where the electricity is used to convey large amounts of energy.
- Electronics engineers prefer to be among low-power diodes, circuit boards, electronic chips, etc., where the electricity is used to convey analog or digital information.
Though both Electronics and Electrical Engineers can do the same job in industry they are not same.
Firstly their education is different as an Electronics Engineer will have more of Electronics papers and lesser Electrical Papers than the Electrical Engineer.
Secondly there is a stark difference between Electrical and Electronics that needs to be addressed. Electrical science normally deals with current in medium that readily allow current to flow through them (conductors).
On the other hand Electronics is a branch of science that deals with current in a medium that is reluctant to let current through them or only allow current through them under certain circumstances (semiconductors).
