Electronics Engineering

12

First off, I'm going to have to quore Robert here: (LIFE SAFETY WARNING! [disclaimer] Electricity is dangerous! You can be injured or killed! Improper installations can cause fire, injury and death! Should you be doing this yourself?) This is one of those questions - if you know this little, you shouldn't be doing what you are planning... No disrespect intended, but this is SO basic that it suggests you have not studied the subject at all! There are many good reference books and course books to study from. Unless you have 208V 3 phase power, you cannot make this work. You cannot power a 208V motor off a 120V supply. Since it is 208V, it is likely that it is a 3 phase motor. That means it has 3 hots. Check the specification plate on the motor, it should say how to wire it. With 208V 3 phase you should be able to get 120 from 1 hot phase to neutral. This means you need 5 feed wires (3 hots, a neutral, and ground) from your panel to your little light/motor contraption. Please buy a book and read up on this. It sounds like you don't know much about your system and ignorance is fatal (and not necessairly fatal to you) with electricity.

IIR filters have nonlinear phase characteristic which means the output of such a filter is (most likely) a deformed version of the input without the filtered frequency. On the other hand IIR filters might become unstable. So IIR filters are used, when the user is not particularly interested in the output in time-domain but only in frequency-domain, e.g. in audio applications such as speakers...

Optical properties of solids are described by the wavelength dependence of the complex refractive index. This is how the medium (the solid) responds to the electromagnetic wave. The dispersion of the real refractive index n(E), where E is the photon energy can be described with the model of many oscillators (electrons), which react to the electromagnetic wave. Simplifying the relations we obtain an equation of a single oscillator with effective parameters, which reflect the contributions of all the oscillators. These parameters are the oscillator strength Ed and the oscillator energy E0. So the oscillator energy is a parameter, connected with the optical properties of the solid and the electron transitions - it is connected with the optical bandgap Eg with the relation E0~1.5Eg.

The unit of measure for current load is amperage, or simply amps.

An inductor looks like a piece of wire to DC. It will thus look like a resistor, and inductor properties do not apply.

p0405 EGR position sensor input below the minimum acceptable voltage range (shorted low) * Clean or replace the EGR * Replace the DPFE * Clean the throttle body * Clean the MAF - use electrical contact cleaner and be gentle

The word Current is a term used to describe the characteristics of electricity, the same way voltage and resistance are used. As an example: voltage is a difference in potental and is often considered the amount of pressure pushing an electrical charge or certain number of electrons through a conductor. This electrical charge is called current. Any conductor has resistance to the flow of charge or current. If for example a conductor has a resistance of 2 ohms and a voltage of 12 volts is applied the resulting current flowing in the circuit can be measured to be 6 ampere..the unit for current. Current is therefore, considered the intensity or amount of charge.Electricity then is the movement of this current of charge The word Current is a term used to describe the characteristics of electricity, the same way voltage and resistance are used. As an example: voltage is a difference in potental and is often considered the amount of pressure pushing an electrical charge or certain number of electrons through a conductor. This electrical charge is called current. Any conductor has resistance to the flow of charge or current. If for example a conductor has a resistance of 2 ohms and a voltage of 12 volts is applied the resulting current flowing in the circuit can be measured to be 6 ampere..the unit for current. Current is therefore, considered the intensity or amount of charge.Electricity then is the movement of this current of charge

Continuous I assume would mean a constant flow of light from the laser in the form of a wave train. Conversely, a pulse is only a single wave emitted by the laser.

Did you measure the currents?

Look also to the voltage (peaks). Thyristors can damage due to voltage peaks form the grid (in your case the generator). Are there more loads connected to the generator which can cause voltage peaks?

Dear Sir,

One of the possible reasons for voltage over-shoot is your Generator which is not rated much beyond your load. Please note that any AC Motor will draw heavy current at start-up depending upon load characteristics which may even be four times than your rated current. Under such circumstances, your generator will be overloaded and frequency and voltage may take a momentary dip. ( Yes, Dispite using a soft starter!). This will create a complex situation which is will make the governor of Generator feed more fuel for increasing the speed and exitation of Alternator to inject more current to increase voltage.

This may make the voltage to overshoot momentorily, which might probably destroy your thyristors. If more details are provided, like when do thyristors fail, at startup or while running, may help analyse this better.

Hope this helps.

Mahesh Vyas.

mail@archana.co.in

There may also be a possible ground fault within the motor or the wires to the motor. The ground fault occurs when the motor is conducting through an alternate path than the phase wires. Some systems use a current transformer around all the phase wires to determine if there is a ground fault as it will detect any time the currents don't sum to zero in a three phase system.

A variable linearity coil has a coil which is wound around a magnetic core, a permanent magnet for charging a bias magnetic field to the magnetic core, and a magnetic field adjusting coil for adjusting the bias magnetic field. The coil and the magnetic field adjusting coil are respectively disposed horizontally such that an axial line of each of the coils lies perpendicular to lead terminals to which terminal ends of each of the coils are connected. The coil, the magnetic field adjusting coil, and the permanent magnet may be contained in a casing and the terminal ends of each of the coil and the magnetic field adjusting coil are connected to lead terminals which are embedded into the casing

Since they're generally encased in epoxy, the manufacturers can make them any color they want. It definitely makes them easier to spot on a PC board.

Ku band, (Transmit frequency 13.75 to 14.50 GHz, Receive frequency 10.70 to 12.75 GHz dependant on which region of the earth you live in) is used rather than C band (4 to 6 GHz) because the higher frequency allows for broader transmit and receive bandwidths, so more data, computer traffic, movies, etc can be sent. The signal power lost in transmitting from earth to the satellite and back to earth again varies with frequency, but not as a simple linear sloping line increasing with frequency way, it has peaks and troughs. This is because at some frequencies Oxygen and Water absorb much more power and it is difficult to generate enough power to pass a strong signal through the atmosphere, so those frequencies are avoided. Ku band uses a part of the frequency spectrum with a lower atmospheric loss between earth and space, so relatively less microwave power is needed to efficiently transmit to and from the satellite.

Dr. Shantanu Kumar Padhi

School of Information Technology & Electrical Engineering

University of Queensland

Biography

Shantanu received his Ph.D in Electronic Science (Microwave Engineering) from University of Delhi, India in 1999. His doctoral thesis focussed on novel design of planar antennas for mobile communication system. He held a visiting research appointment with Wireless Research Group (WSG), School of Information Technology and Electrical Engineering (former School of CSEE/ELEC), University of Queensland, Brisbane in 1997. During his stay in Brisbane, he was working on vehicle mounted antennas for mobile communication system. In 1998 he was working as consultant to SB Electromechanicals Pvt. Ltd and Astra Microwave Pvt. Ltd on design development of phased array antenna for radar level gauge instrument. He was also involved on the development of Ku-band ridged horn antenna for satellite and terrestrial communication link. In 1999 he joined Global Positioning System Centre (currently PWTC), School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, where he was actively involved in the design and development of MEMS antennas and filters for the millimetre-band MEMS RF-Identification Tag (MEMSAT), which was a strategic research project funded by NSTB (currently A*Star), Singapore. During this time he was also involved in other projects; (i) development of RFID system at 2.4 GHz and 5.8 GHz band, (ii) photonic bandgap and (iii) planar antenna array for VSAT applications and (iv) on-wafer RF measurement system upto 110 GHz. The research work results successful lunching of prototypes of RFID system at 2.4 GHz band. In 2002 Shantanu joins Molecular Science division of CSIRO, Melbourne, where he was involved in various projects ; (i) Fractal polymer RFID, (ii) low cost and flexible tag, and (iii) organic electronics. His main research was focussed on covert and overt security features, organic electronics, conducting Polymer, organic diodes, flexible RFID and conducting ink. He joins CSSIP (CRC-SSIP) in 2004 and was working on Microwave imaging of breast cancer project. Currently he is involved in ARC project Target identification with Ultra-wideband Polarimetric Radar. His current research activities includes, design and development of low profile antenna system for UWB communication system, fractal antenna for RFID, time domain near-field and far-field antenna measurements, resonance based target identification, tumor detection and microwave imaging. He has published one book chapter and more than 60 referred articles in journals and conferences.

Above retrieved from Answers.com

Viper1

Usually you have your primary and your secondary. That's just incase you cant get through to one, you have the second as a backup.

Not worth just studying it, but if you can pass it through, you will have feather in your cap. CIMA syllabus is robust and specifically designed for business need, which will definitely add value to your career. Not worth just studying it, but if you can pass it through, you will have feather in your cap. CIMA syllabus is robust and specifically designed for business need, which will definitely add value to your career.

Bit strobing in FlexRay is a process which takes a sample from the bus every cycle of the clock, and besides, it does a majority voting to retrieve the so called voted value. It passes one voted value per sent bit on to the Decoding, the channel idle detection and the wakeup symbol decoding. This means one for every 8 samples in FlexRay.

Free model foundry does have many Flash memory models. (Simulation models). They are available under GPL license. (Atleast those I've downloaded were under GPL, you can check for alternative lic on their site) Though I believe, many of them may be NOR, however some may be for NAND as well. Check them out.

Listing(VHDL):

http://www.freemodelfoundry.com/flash.php

( or http://www.freemodelfoundry.com/model_list.html and go to table Flash memories)

Listing(Verilog/SV):

http://www.freemodelfoundry.com/vlog_flash.php

( or http://www.freemodelfoundry.com/vlog_model_list.html and go to table Flash memories)

--

Abhishek Kohli

+919974772274

A device for accurate measurement of temperature difference between two junctions. A thermocouple consists of two dissimilar metals joined at two joints in a loop so that the difference in voltage can be measured. If the temperature of one junction is known, the other junction temperature can be calculated. Since voltage changes in proportion to temperature, the voltage difference indicates temperature differences.

Volts = Amps * ohms

110 = 100*1.1

Thus the voltage was 110 Volts.

• airplane navigational RADAR, helps the crew of an airliner know where they are and what is around them
• airport RADAR, helps airport staff know where incoming and departing aircraft are
• air traffic control RADAR, helps controller know where aircraft in their area are
• weather RADAR, helps meteorologists know where storms and precipitation are
• police RADAR, helps police identify speeding drivers and how fast they are going
• etc.

Stripper, crimper soldering iron, cutting pliers, a small hammer sometimes.

All signal multiplexing techniques were invented to permit a single physical communication channel to carry multiple different signals. This reduces the investment costs in physical communication channels: e.g. long distance telegraph lines, long distance telephone lines, microwave links, orbiting communication satellites, fiber optic cable.

Time Division Multiplexing can be implemented using either analog or digital signaling means.

The tinning allows the solder to wet the joint faster, which results in more rapid heating of the joint and faster solder flow into the hot joint. Rapid completion of making the joint allows quicker removal of the soldering iron (or other heat source) and less excess heat flow through the leads to the component.

Factory pretinned component leads also prevents corrosion prior to use, which both protects parts in storage and makes soldering faster and cleaner by not having to use lots of flux to remove corrosion.