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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
How many items will a 15kva electric generator support?
In theory, you should be able to load your generator to 15 kV.A (mine stalls far below that load, though!!!). So, divide this figure by the rated output voltage of the generator, and this tells you the maximum current it can supply. The sum of your individual loads should not exceed that value of current. (The current drawn by an individual load is its power rating divided by the supply voltage -just add them up!).
Why you do not use capacitor in a transistor as switch?
The capacitor is there to block any dc voltage that might be applied to the input terminal, which could cause damage or upset the biassing if it was allowed through to the base.
Power (Watts) = Current (Amps) * Voltage
Power = 22Amps * 240 Volts
Power = 5,280 Watts
5280
What does a electronics engineer do?
they fix electrical stuff that people broke.
the electrical engineering equivalent of a union is IEEE (www.ieee.org) which is the largest private organization in the WORLD.
- Confer with engineers, customers, and others to discuss existing or potential engineering projects and products.
- Design, implement, maintain, and improve electrical instruments, equipment, facilities, components, products, and systems for commercial, industrial, and domestic purposes.
- Operate computer-assisted engineering and design software and equipment to perform engineering tasks.
- Direct and coordinate manufacturing, construction, installation, maintenance, support, documentation, and testing activities to ensure compliance with specifications, codes, and customer requirements.
- Perform detailed calculations to compute and establish manufacturing, construction, and installation standards and specifications.
- Inspect completed installations and observe operations, to ensure conformance to design and equipment specifications and compliance with operational and safety standards.
- Plan and implement research methodology and procedures to apply principles of electrical theory to engineering projects.
- Prepare specifications for purchase of materials and equipment.
- Supervise and train project team members as necessary.
- Investigate and test vendors' and competitors' products.
- Oversee project production efforts to assure projects are completed satisfactorily, on time and within budget.
- Prepare and study technical drawings, specifications of electrical systems, and topographical maps to ensure that installation and operations conform to standards and customer requirements.
- Investigate customer or public complaints, determine nature and extent of problem, and recommend remedial measures.
- Plan layout of electric power generating plants and distribution lines and stations.
- Assist in developing capital project programs for new equipment and major repairs.
- Develop budgets, estimating labor, material, and construction costs.
- Compile data and write reports regarding existing and potential engineering studies and projects.
- Collect data relating to commercial and residential development, population, and power system interconnection to determine operating efficiency of electrical systems.
- Conduct field surveys and study maps, graphs, diagrams, and other data to identify and correct power system problems.
Knowledge Requirements for: "Electrical Engineer"
Engineering and Technology -- Knowledge of the practical application of engineering science and technology. This includes applying principles, techniques, procedures, and equipment to the design and production of various goods and services.
Computers and Electronics -- Knowledge of circuit boards, processors, chips, electronic equipment, and computer hardware and software, including applications and programming.
Mathematics -- Knowledge of arithmetic, algebra, geometry, calculus, statistics, and their applications.
English Language -- Knowledge of the structure and content of the English language including the meaning and spelling of words, rules of composition, and grammar.
Design -- Knowledge of design techniques, tools, and principles involved in production of precision technical plans, blueprints, drawings, and models.
Physics -- Knowledge and prediction of physical principles, laws, their interrelationships, and applications to understanding fluid, material, and atmospheric dynamics, and mechanical, electrical, atomic and sub- atomic structures and processes.
Telecommunications -- Knowledge of transmission, broadcasting, switching, control, and operation of telecommunications systems.
Production and Processing -- Knowledge of raw materials, production processes, quality control, costs, and other techniques for maximizing the effective manufacture and distribution of goods.
References - http://www.careerplanner.com/Job-Descriptions/Electrical-Engineers.cfm
What is the value of current in a series when one resistor is open?
Since it is a series circuit with only one path for current, an open anywhere along that single path will cause current flow to be 0 amps.
What device converts direct current to alternate current?
Any device that has a battery and can be plugged into the wall. The power coming from the battery is DC, while the power from the wall is AC.
What best describes magnetic field lines?
Magnetic fields are produced because of moving electric charges, and visualizing the very complex mathematical relationships that fall under the magnetic field might become much easier if magnetic field lines were used. A higher density of field lines means a stronger magnetic field. Keep in mind that those lines do not actually exist; they are drawn only to visualize the strength of the magnetic field.
How much power is consumed by a circuit wit 120v source that draws 18A through a resistance load?
Just get out your trusty calculator and multiply 120 times 18.
What determines the amount of deviation of an fm signal?
FM or frequency modulation is a means to vary the frequency withing a set basic frequency and transmit it. FM radio demodulate the frequency extracting the signal that made the frequency shift at the source.
What is the waveform of the output of a half-wave rectifier?
Pulsating dc.
Imagine a sine wave that goes above and below the zero voltage level. A 1/2 wave rectifier clips all the waves either above or below zero voltage. You basically have a hump for 1/2 a cycle then zero voltage for 1/2 a cycle, and then another hump and so forth.
What is the formula to calculate the current carrying capacity of bus bars?
Find out the volume of that object and then the mass of it and divide the mass by the volume to get the density.
Comment:
The answer given above is very wrong(in electricity).
Answer:
Bus bars carry high currents and thus a current transformer is used. It uses the bus bar as its primary winding and its wound section as its secondary winding. The magnetic flux of the bus bar due to its current is very small thus the current in the secondary windings will be small as well and safe to measure with a traditional Ammeter.
NB: These types of work must only be carried out by a qualified electrician. Don't put your life at risk.
Signal number two is the second warning of a coming storm or typhoon. Classes in elementary and prep are cancelled.
What are the reasons that low frequency parameters cannot be Measured in microwaves?
(a) voltage and current readings vary with position along the
transmission line,
(b) voltage and current are difficult to define in non-TEM transmission
lines.
How To design an appropriate logic gate combinatin for a given truth table?
A truth table simply shows you the output that corresponds to each combination of inputs for a given Boolean operator. Boolean operator inputs and outputs have only two possible states (true or false) and operators may be unary (one input), binary (two inputs), ternary (three inputs) and so on.
The unary operators are the simplest operators to understand as they only have one input. To cater for all possible outputs we need four unary operators in total:
OP1(0) = 0 | OP1(1) = 0
OP2(0) = 0 | OP2(1) = 1
OP3(0) = 1 | OP3(1) = 0
OP4(0) = 1 | OP4(1) = 1
OP1 returns false regardless of whether the input is true or false.
OP2 returns the state of the input.
OP3 returns the inverted state of the input.
OP4 returns true regardless of whether the input is true or false.
Of these four operators, OP3 is the most interesting; its truth table corresponds with that of the NOT operator truth table.
NOT (false) = true
NOT (true) = false
Although OP1, OP2 and OP4 logically exist as operators, OP1 and OP4 have no practical uses and OP2 is implicit.
Binary operators have two inputs thus each operator has four input combinations:
OP (0, 0)
OP (0, 1)
OP (1, 0)
OP (1, 1)
With four outputs, we need 16 operators to produce all the possible output combinations:
OP0(0, 0) = 0 | OP0(0, 1) = 0 | OP0(1, 0) = 0 | OP0(1, 1) = 0
OP1(0, 0) = 0 | OP1(0, 1) = 0 | OP1(1, 0) = 0 | OP1(1, 1) = 1
OP2(0, 0) = 0 | OP2(0, 1) = 0 | OP2(1, 0) = 1 | OP2(1, 1) = 0
OP3(0, 0) = 0 | OP3(0, 1) = 0 | OP3(1, 0) = 1 | OP3(1, 1) = 1
OP4(0, 0) = 0 | OP4(0, 1) = 1 | OP4(1, 0) = 0 | OP4(1, 1) = 0
OP5(0, 0) = 0 | OP5(0, 1) = 1 | OP5(1, 0) = 0 | OP5(1, 1) = 1
OP6(0, 0) = 0 | OP6(0, 1) = 1 | OP6(1, 0) = 1 | OP6(1, 1) = 0
OP7(0, 0) = 0 | OP7(0, 1) = 1 | OP7(1, 0) = 1 | OP7(1, 1) = 1
OP8(0, 0) = 1 | OP8(0, 1) = 0 | OP8(1, 0) = 0 | OP8(1, 1) = 0
OP9(0, 0) = 1 | OP9(0, 1) = 0 | OP9(1, 0) = 0 | OP9(1, 1) = 1
OPa(0, 0) = 1 | OPa(0, 1) = 0 | OPa(1, 0) = 1 | OPa(1, 1) = 0
OPb(0, 0) = 1 | OPb(0, 1) = 0 | OPb(1, 0) = 1 | OPb(1, 1) = 1
OPc(0, 0) = 1 | OPc(0, 1) = 1 | OPc(1, 0) = 0 | OPc(1, 1) = 0
OPd(0, 0) = 1 | OPd(0, 1) = 1 | OPd(1, 0) = 0 | OPd(1, 1) = 1
OPe(0, 0) = 1 | OPe(0, 1) = 1 | OPe(1, 0) = 1 | OPe(1, 1) = 0
OPf(0, 0) = 1 | OPf(0, 1) = 1 | OPf(1, 0) = 1 | OPf(1, 1) = 1
From this, given two inputs, a and b, we can observe the following:
OP0 returns false regardless of the input states.
OP1 returns true if both inputs are true: AND (a, b).
OP2 returns true if the first input is true and the second is false: AND (a, NOT (b)).
OP3 returns true if the first input is true: a.
OP4 returns true if the second input is true and the first is false: AND (NOT (a), b).
OP5 returns true if the second input is true: b.
OP6 returns true if one and only one input is true: XOR (a, b).
OP7 returns true if one or both inputs are true: OR (a, b).
OP8 returns false if one or both inputs are true: NOT (OR (a, b)).
OP9 returns false if one and only one input is true: NOT (XOR (a, b)).
OPa returns false if the second input is true: NOT (b).
OPb returns false if the second input is true and the first is false: NOT (AND (NOT (a), b)).
OPc returns false if the first input is true: NOT (a).
OPd returns false if the first input is true and the second is false: NOT (AND (a, NOT (b)).
OPe returns false if both inputs are true: NOT (AND (a, b)).
OPf returns true regardless of the input states.
Note that the lower half of the operator table is simply the inversion of the upper half. E.g., OPc is the same as NOT (OP3).
As before, OP0 and OPf logically exist but have no practical uses. OP1, OP6 and OP7 are the three we use most often, corresponding to the AND, XOR and OR operators respectively:
AND (false, false) = false
AND (false, true) = false
AND (true, false) = false
AND (true, true) = true
XOR (false, false) = false
XOR (false, true) = true
XOR (true, false) = true
XOR (true, true) = false
OR (false, false) = false
OR (false, true) = true
OR (true, false) = true
OR (true, true) = true
OP8 is sometimes implemented as a NOR operator while OPe is sometimes implemented as a NAND operator.
What is the importance of threshold voltages and how does it work in a circuit?
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Political diversity is the different political opinions that people have. It is allowing people the right of having different political opinions and outlooks.
Breifly explain about reactive power in electric circuits?
Reactive power is opposite to Active power. The vector sum of these two powers is apprant power. So reactive power is vector difference between Apprant power & actual power given by
Reactive power= Root of (difference between squares of apprant & active power).
It is lost power of the system on which power factor depends.
What is the use of bridge rectifier?
Most of the circuits comprising of electronic components run on dc supply..
As DC supply is not available directly for us, we use either 230/12V or 230/18V transformer to stepdown the available 230V (in some countries it is 110v) and then convert it into dc using a rectifier.
As a bridge rectifier is more efficient than a conventional full wave rectifier, about 81.2%, it is widely used in such type of circuits.
What is the resistance value of 2.2 megohm resistor?
A megohm is 1,000,000 ohms, so 2.2 megohms is 2,200,000 ohms, often abbreviated to 2.2M, or 2.2Mohm, or 2M2.
What are some examples of RF technology?
Radio Frequency is a wireless technology consisting of a transmitter and receiver tuned to the same frequency
What material will allow electricity to flow between the battery and the lightbulb?
Yes, copper wire is a conductive element and is the most addiquite substance for distribution of electricity known.
What are the disadvantages of a bridge rectifier?
One segment goes out, you replace the whole thing. They tend to build up a little extra heat since they're all crammed into a single package.
To avoid problems, use a bridge that will only run at half capacity. Meaning, if your device is pulling 1 amp, use a 2 amp bridge.
And USE A HEAT SINK!!! and don't forget the heat sink grease.
What is unidirectional device?
A device which operates(or function) only in one direction is called unidirectional (or unipolar) device
As more lamps are put into a series circuit what happens to the overall current in the circuit?
The more lamps you add, the dimmer each would become. The brightness would be the same for each lamp -providing they are all the same wattage. If one of the lamps wasn't working, then none of them would work. If the wattage of the lamps varied, the brightest lamps would be those with the lower wattage rating (yes, this is not a mistake!).
Lamps in series can be dangerous if one isn't working, because the full circuit voltage would appear across the open terminal.
