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Electronics Engineering

Electronics Engineering is a branch of engineering that deals with practical applications of electronic components, devices, systems, or equipment. Electronics are devices that operate on low voltage sources, as in electron tubes, transistors, integrated circuits, and printed circuit boards and use electricity as part of its driving force.

24,372 Questions

What is vector scan?

Scanning mode in which beam is scanning selected areas only; after scanning of selected area is completed beam is turned off and moved to another area to be scanned. It is also called Raster Scan Method.

Explain in brief reflex klystron oscillator?

The Reflex Klystron:Another tube based on velocity modulation, and used to generate microwave energy, is the REFLEX KLYSTRON. The reflex klystron contains a REFLECTOR PLATE, referred to as the REPELLER, instead of the output cavity used in other types of klystrons. The electron beam is modulated as it was in the other types of klystrons by passing it through an oscillating resonant cavity, but here the similarity ends. The feedback required to maintain oscillations within the cavity is obtained by reversing the beam and sending it back through the cavity. The electrons in the beam are velocity-modulated before the beam passes through the cavity the second time and will give up the energy required to maintain oscillations. The electron beam is turned around by a negatively charged electrode that repels the beam. This negative element is the repeller mentioned earlier. This type of klystron oscillator is called a reflex klystron because of the reflex action of the electron beam.

Check out the link below for more information.

How does the brightness of each bulb in a parallel circuit compare to the brightness of the bulb in a simple circuit?

The brightness of each bulb in a parallel circuit is the same as the brightness of a bulb in a simple circuit. By Kirchoff's voltage law, each element of a parallel circuit has the same voltage drop across it. With the same voltage, the same type of bulb will dissipate the same power, and have the same brightness.

What is the HFE for good transistors?

A: HFE is meaning less uunless current is specified. For a switch force gain of 10 for an amplifier at low level maybe 100 for the same transistor.

Do computers use radio waves?

Absolutely. Computing is highly integrated into radio frequency (RF) type communications. Examples of RF integration include Bluetooth, WiFi, and RF peripherals such as the mouse and keyboard.

What are the boolean theorems?

Commutative x + y = y + x x . y = y . x Associative x+(y+z) = (x+y)+z = x+y+z x.(y.z) = (x.y).z = x.y.z Distributive x.(y+z) = x.y + x.z (w+x)(y+z) = wy + xy + wz + xz x + xy = x x + x'y = x + y where, x & y & z are inputs.

Where can you get a test pattern generator?

These are mainly used for setting up TV's, you can typically pick them up from some Electronics Stores, the type that sell electronic components and test gear, not just consumer electronics.

Why does your 1986 Landcruiser not start after the motor is warm?

Is it petrol or diesel? if it is petrol then the spark plugs may need replacing or the valves are not operating properly at higher temperatures. If in doubt get it checked by a qualified mechanic.

Another possibility is the anti-vaporlock fan is not working. This is a fan on the left side of the engine compartment in FJ60 and FJ62 gasoline models. This can be a fan failure, or the thermal switch. If you don't hear the fan running when the engine is switched off, this is the most likely cause. Opening the hood to allow cooling will get you by.

What is the impact of semiconductor memories?

Semiconductor RAM (Random Access Memory) chips were first used in computers and other electronic equipment back in the late 1960's. They rapidly became popular because they were very much cheaper to manufacture than the magnetic core memory stacks (which themselves had replaced even older devices such as physical wave delay lines) which were, up to then, the only form of RAM available for mainframe or minicomputer manufacturers to use. The main impacts of the introduction of semiconductor RAMs were: * the possibility to install much larger amounts of logical RAM in computers * housed in a very much smaller physical space * taking very much less power and * at a much lower cost per unit of memory than was ever possible using magnetic core memory stacks. As a result: * the use of semiconductor RAM soon led to closure of most factories set up by mainframe manufacturers after World War II to make magnetic core memory stacks. Relatively few workers are needed in a factory making semiconductor RAM chips and circuit boards compared to one making magnetic memory stacks having the same amount of logical RAM * along with the availability of microprocessor chips, semiconductor RAM made possible the rapid introduction of powerful, yet very cheap, minicomputers * instead of making mainframe computer systems, manufacturers were soon forced to switch their production mix to make far less mainframes. Factories which had been making relatively few massive mainframes were soon full of the quite different production lines needed to make thousands of minicomputers, pcs and server systems.

What is frequency dead band in turbine control system?

it is range of frequency variation for which governor does not take any proportional corrective action.

What AC motor is used in an escalator?

we can either use dc series motor or induction machine ,but dc supply is not easily available so we use induction motor ,

Who invented embedded system?

One of the first recognizably modern embedded systems was the Apollo Guidance Computer developed by Charles Stark Draper.http://www.answers.com/topic/charles-stark-draper

How stability is achived in voltage divider biasing?

A: A transistor needs to be biased at a point whereby it is in a linear point with respect to the load otherwise it can give an output that is non linear or clipping. so with the proper bias the circuit is stable or useful.

Why does the radio on your phone keep cutting off?

It is usually because you are not in a area with reseption. Or it could just be you have a crapy phone.

Inalliv's answer:

Currently we are in a sunspot maximum and that can cause radio problems.

Where can I find output transistors to repair and amplifier?

You need to know the specifications for the transistors and search for them on the internet.

What are oscillator transducers?

A transducer (trans = across, duce = to lead) is a device that converts one form of energy into another. A microphone converts sound waves into electrical signals. Others would be accelerometers, loudspeakers.

An oscillator on the other hand, generates a signal without there being an input signal.

These are two different things.