Electronics Engineering

Half- and full-wave rectifiers are used to convert AC into DC. That is the primary use of the rectifier in industrial applications. AC is used across the power grid, but to use electricity for welding, electroplating, electrorefining (of metal) and as a DC source for motors with special speed controls, the AC must be changed (rectified) to DC.

yes ,Q factor is ratio of energy stored to energy dissipated

There are three main considerations were selecting the location of an earth station. These considerations are location, traffic volume, and channel performance.

Assume the AC currents are going in opposite (SAME) directions in a twin pair transmission line. The magnetic fields so created have the effect of forcing the current flow towards the centre (OUTSIDE). The effect is greater with higher frequency. As the copper is not being effectively utilised, the resistance goes up. This effect is distinct from "skin effect". The effect is also greatest if the gap between wires is small. Unfortunately, as of April 2009 an on-line calculator is difficult to find.

The UHF frequency band used for GPS transmissions for clear reception and sending. UHF or ultra high frequency is meant for radio frequencies between 300MHz and 3GHz. Normal frequencies for GPS transmissions are 1575.42 MHz and 1227.60 MHz. UHF frequency band covers these GPS frequencies.

the lower you can get your power dissapation means the less heat the electronic piece will have to give off. the lower it is, the more efficient the system is. the lower you can get your power dissapation means the less heat the electronic piece will have to give off. the lower it is, the more efficient the system is.

B. Tech Candidates are eligible for junior engineers in RRB. It does not matter which university they graduated from. This is applicable to Indian nationals.

schedule is thickness of the inside diameter of the pipe,schelude 40 is usually a standard thickness for most applications which is normally 1/4" wall,as the schedule number increases or decreases so does the wall thickness,the outside diameter remains the same,standard piping schedules are 10,40,80,120,160 ========================================= ***This question came up at work the other day and in searching for an answer I found that a lot of people have the same question... I finally found an explanation on a website (I have included the paragraph and link below). I can not confirm its accuracy; however, it makes more sense than anythign else out there that I've read. Schedule is NOT directly a measure of thickness, it is a measure of the pressure a pipe can withstand without deflection or failure. When you are talking about pipes constructed of the same materials (i.e. PVC) a thicker pipe would be able to withstand higher pressures. As a result, many people have taken "schedule" to be synonymous with thickness. "For the purpose of standardizing pipe dimensions, the American National Standards Institute (ANSI) sponsored by the American Society for Testing Materials (ASTM) and the American Society of Mechanical Engineers (ASME), published ANSI B36.10. To broaden the range of wall thicknesses, schedule numbers from schedule 10 (S.10) thru schedule 160 (S.160) were adopted for steel pipe. These schedule numbers indicate approximate values for 1000 times pressure-stress ratios." From http://www.durovac.com/industrial-vacuum/tubing-fittings/stuff-about-pipe.htm

A "block" is a sizeable unit of computer data. In contrast to the conventional sector (which is set at 512 bytes), a block can be smaller or bigger (it can be equivalent to one or more units of at least one sector, called a cluster).

The nucleus of an atom is always positively charged.

The magnitude of the positive charge is proportional to the atomic number of the element.

For instance, the charge on a nucleus of Hydrogen is +1 or +1.6 x 10-19 C as the atomic number of Hydrogen is 1.

The charge on a nucleus of carbon (at. no. =6) is +6 or +6 x 1.6 x10-19 C

GIB stands for General Information Block, suitable for high load applications. These blocks are made of solid aluminum bronze with self-lubricating graphite.?æ

One hertz is defined as (1/sec) or (sec-1). So 1 hertz = (1 / 1 sec). Multiply by (60 sec / 1 min), the seconds units cancel, and you have (60 / 1 min) or 60RPM. See related links for more information.

Either electronically through a DC Bus similar to what is used in a Variable Frequency Drive, or through a Voltage doubler where resistors in parallel with a series r off of the p resistor acts as a voltage multiplier. Search for Voltage divider, or DC amplifier.

Electric dimmers work basically by controlling the amount of voltage going through. It chops out portions of the current, and the reduced voltage reduces the power of the receiving device, usually a light.

it means the products are tested and manufactured in Europe. If it has a UL label as well it was tested in the US. It is the European equivalent of UL. Note: the standards for CE are lower than those for UL!

The signal or output of a circuit is often affected by changes in the supply voltage and/or ambient temperature. A biasing circuit is designed to consistently output a selected voltage (or current). Depending on the circuit topology, a change in supply voltage or temperature can cause the intended value to drift. In an increase in temperature can, for example, increase resistances in a circuit. Such effects are usually undesireable and thus a supply/temperature independent bias would be needed. Electronic component manufactures will frequently provide tolerances for outputs relative to changes in supply voltage and temperature.

Copper is the best base metal for conducting electricity. Gold and silver are better but too expensive.

If you used a poorer metal you would lose more power and it would also generate more heat which in a motor would be quite a lot. More heat would then cause more resistance which would cause more heat.

Depending on how it is used, it can have different applications. However, RF scanning is where one runs a receiver through a series of radio frequencies (RF), and tries to identify a specific frequency.

It can include illegal operations, such as RF scanning wherein a transmitter is used to transmit a scan to interfere with transmitters such as petrol pumps, or scanning to locate cell or wireless telephone transmissions.

Or there can be harmless applications such as simply tuning a radio manually.

Class B circuit fire alarms are much louder and powerful than class A's. They are only recommended for people with sever hearing loss.

- Output current in excess of 1A

- Internal thermal overload protection

- No external components required

- Output transistor safe area protection

- Internal short circuit current limit

- Available in the aluminum TO-3 package

Frequency modulated continuous-wave (FM-CW) radar is usually used with a couple of different antennas. One is for the transmitted signal, and another one (or more) is (are) used for the reception of any returns. We usually think of radar as a pulse of electromagnetic energy that is transmitted out, and then a receiver looks for any returning (reflected) signal. In FM-CW radar, the transmitter is "always on" and a continuous signal is being sent. Additionally, the frequency of the transmitted signal is varied (or "swept") above and below a center frequency which the local oscillator runs on and maintains. The new units are largely microprocessor controlled pieces of equipment. They take the now-FM-modulated signal and broadcast it continuously (per the name - CW, which is continuous wave), and the returns are picked up by a receiver. The frequency of the return signal is compared to the instantaneous frequency of the transmitter, and the frequency difference can be looked at by a processor which can derive a time difference between the two signals (based on the differential frequency). This derived time difference will be proportional to the distance to the target that returned the signal. Another bit of processing on the signal returned from that target will produce a rate of change of distance, which can be converted to speed. As the power of the processors that we task with these objectives in mind has increased so dramatically, the processor can plot a course and speed with all appropriate vectors we wish to visualize when it puts up its findings on some kind of display - and in color! Particulars become technical very quickly, but the overview is accurate. A link to the Wikipedia article on FMCW is supplied, but at this writing, the article is still a stub that will supply little more than is here already.

hamming code between 1000110 and 1110100 can be calculated by just exoring both codes with each other as follow: 1000110 1110100 ------------ 0110010 now by counting the ones in the result that gives 3 then hamming dictance = 3

This product is designed to automatic control of motor, which ensures constant reserve of water in storage tanks.

Automatic water level controller is used to automatically fill the over head tank as and when it gets empty and monitor the water level in it.

Automatic water level controller switches ON the motor when the water level in the overhead tank drops below pre fixed low level(on point) and puts off the motor when water level rises up to pre fixed high level (off point) motor also switches off when the sump water is exhausted before filling overhead tank, pump running dry, Mains voltage fluctuations.

Electrical inductive motors, transformers and magnetic ballasts bring real power that are measured in kilowats and reactive power (measured in kilovolt-amperes reactive, kvar). Real power genrates "productive" work. Reactive power does the the magnetic field required for inductive devices to operate.