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Engineering
Engineering is an art and profession devoted to designing, constructing, and operating the structures, machines, and other devices of industry and everyday life.
5,839 Questions
A pulse jet engine is one of the most simple and efficient propulsion devices ever designed. There are three types of pulse jet engines: The valved pulse jet, the valveless pulse jet, and the upright or "Jam jar jet". For complete details on pulse jet engines, go to wikipedia.org and search "Pulse Jet Engine".
Is a voltage and current source the same thing?
Voltage source inverters use the dc voltage (e.g a capacitor in parallel) as a source while the current source inverer (inductor in series) use the dc current as a source. Please note that voltage can not be changed abruptly in capacitor as current can not be changed abruptly in inductor.
Why is the spindle on the lathe hollow?
The hollow spindle of a lathe allows for longer lengths of material to be held in the chuck thus eliminating constant material changing to and from the lathe in production turning. The best advantage is the saving in material costs. If one had to manufacture 20 bushings and they were all cut into separate billets, half of the material would be lost because the chuck needs some material to grip the work piece on.
If for example 20 bushings of 50mm OD by 50mm long have to be made, one would need a piece of material of at least 1150mm long. A single shaft or hollow bar of this length can usually be stuck into the hollow spindle with only enough material sticking out to make one or two bushings at a time. Once they are parted off, the material can simply be pulled out and the next one or two bushings can be machined. In the end the wastage will only be a piece of material of 70mm long instead of 20 pieces of 40 or 50mm long without a hollow spindle.
How many centimeters is twenty two inch?
There are 2.54 centimetres in one inch. Therefore, 22 inches is equal to 22 x 2.54 = 55.88 centimetres.
Algebraic Steps / Dimensional Analysis Formula 22 in*
2.54 cm
1 in
=
55.88 cm
The acidity of water is based on the pH scale. Seeing that water is neither Basic or Acidic it is Neutral. This places water with the pH level of 7. So the water Acidity is 7.
How many fins should you put on a long range bottle rocket?
http://www.apogeerockets.com/technical_publication_16.asp.
best of luck! :]
Why toulene is ortho and para directing?
Toluene is an aromatic compound, generally it under goes electrophilic substitution reactions i.e. usually one of the hydrogen, is replaced by an electrophile. It increases the electron density at ortho and para position only not at meta. So electrophile attacks at ortho and para position.
Ex. Nitration of Toluene
What are the elements of good experimental design?
builds on previous research
-describes all steps in procedure clearly and completely
-describes all data to be collected
-keeps all variables, except the one being tested, the same
-includes a control (or placebo) for comparison -uses an appropriate group of subjects
-may include a large sample size
-may include multiple trials
-can be reproduced by other investigators to give -similar results
-respects human and animal subjects
*Elements may vary, depending on the problem being studied
The five components of experimental design are:
-Independent Variable
-Dependent Variable
-Constant Variables
-Control group
-Number of Repeated Trials
Good Experimental Design is Simple;
1. simple in Concept ( no complex ideas)
2. simple in execution (not complex to do)
3. simple to replicate (repeat by others)
4. simplest complete result.
Is engineering tough if you are good at algebra?
Basically, any university study is tough. In the case of engineering, you need to learn lots of math and science. However, being good an algebra is a good sign. Of course you'll need to learn quite a bit more than high-school algebra, but knowing this algebra is an important basis - you'll need it to study engineering. Also, it is an indication that you might be good at other, similar, subjects (i.e., more advanced math).
What is the heaviest substance that will float in water?
All substances will float on water if you engineer them into a thin enough flattened out sheet and curve the edges up slightly as to displace enough water such that the weight of that volume of water that is displaced is heavier than the constructed piece of material.
What brand of laptops is good for engineering students?
See I myself is a student of electrical engineering at a govt. engineering college in india. Well it was too difficult for me too to figure out which laptop I should buy. I have selected some laptops , u can pick up anyone of these based on the price Rs. 10,000-20,000 go for Wipro ego minilaptops Rs. 20,000-30,000 go for Acer aspire laptops based on dual core processor. Rs. 30,000-40,000 U can choose HCL leaptops, they are great value for money. Rs. 40,000-50,000 Go for Sony Vaio VGN series laptops they cost around 45,000 and have core2duo processor. Rs. 50,000-60,000 choose DELL studio 15 - its the best fit for any job. I have this one. Its a fast and responsive laptop with high-definition WLED screen, 512MB graphics card,4GB RAM,500 GB HDD and slot drive. I am loving it. Its Wi-fi capability is superb.We have around 3,500 laptops in our college of different makes. I have compared mine with all others. Mine is the best.......everyone accepts that. Rs. 60,000-70,000 Dell XPS . They are even better than studio laaptops but are quiet costly for a student. beyond 70,000 I have no idea coz i never thought of purchasing a laptop in this range.
Which of these single celled organisms are often used as hosts in genetic engineering?
According to the link below,
Escherichia coli (a bacterium),
Saccharomyces cerevisiae (baker's yeast),
Dictyostelium discoideum (slime mold),
Drosophila melanogaster (a fruit fly),
Caenorhabditis elegans (a soil roundworm),
Brachydanio danio (zebrafish),
Xenopus laevis (African clawed frog),
Arabidopsis thaliana (a mustard weed),
Zea mays (maize, or corn),
and Mus musculus (mouse).
Others include sea slugs, seaurchins, cyanobacteria, Chlamydomonas (an alga), puffer fish, Tetrahymena (a protozoan), and rats
Need of pre-emphasis and de-emphasis circuits in digital communication?
de-emphasis is the complement of pre-emphasis, in the antinoise system called emphasis. Emphasis is a system process designed to decrease, (within a band of frequencies), the magnitude of some (usually higher) frequencies with respect to the magnitude of other (usually lower) frequencies in order to improve the overall signal-to-noise ratio by minimizing the adverse effects of such phenomena as attenuation differences or saturation of recording media in subsequent parts of the system.
Special time constants dictate the frequency response curve, from which one can calculate the cutoff frequency.
What is the fracture toughness of nylon?
a middle weight (like a 92) has a tensile strength of about 15 lbs.
Why is sketching important engineering skill?
It is important to technical people like Marine Engineers because it is the ability to form ideas and designs, and turn these into realities is always never -ending task to the engineers.
* High degree of Precision for wide range of surfaces as compared
to manual measurements
* Quicker turnaround time as compared to conventional methods
* Reproduce existing machine part or object efficiently & cost-
effectively
* Faster time-to-market for your products
What are the uses of differential equations in engineering?
You'll find ordinary differential equations (ODEs) being used in chemical engineering for many things, such as determining reaction rates, activation energies, mass transfer operations, heat transfer operations, and momentum transfer operations.
Thomas Telford died on September 2, 1834 at the age of 77.
What are some advantages and disadvantages of mining engineering?
disadvantages of mining is that the chemicals used to extract the minerals will go down lakes which well put a big impact on the environment
UPDATE
This answer needs a slight correction. Chemicals are NOT used to extract minerals during mining in the United States. In some instances in South America, chemicals are used to "cluster" ores together, but this practice is not used in the United States. "Pollution of streams" that occurs in the United States is usually from the natural acidity of the geologic formations. Mining companies in the United States are required by federal law to take steps to decrease the drainage of acidic strata, so water pollution is not as prevalent as believed.
What is a fuel use for international space station?
The international space station makes use of solar power.
What is age limit of IAS exam?
Age Limit
i. A candidate must have attained 21 years and not be over 30 years on August 1 of the year of examination.
ii. The upper age limit is relaxed in specific cases as mentioned below:
a. upto a maximum of 5 years if the candidate belongs to SC/ST.
b. upto a maximum of 3 years if the candidate belongs to Other Backward Classes.
c. upto a maximum of 5 years if the candidate had been domiciled in Jammu & Kashmir during the period between January 1, 1980 and December 31, 1989.
d. upto a maximum of 3 years in the case of Defence Services personnel disabled during hostilities with foreign countries or in a disturbed area and consequently released.
e. upto a maximum of 5 years in the case of ex-servicemen including Commissioned Officers and ECOs / SSCOs who have rendered at least five years Military Service as on August 1 of the year of examination and have been released: * on completion of assignment (including those whose assignment is due to be completed within one year from August 1 of the year of examination) otherwise than by way of dismissal or discharge on account of misconduct or inefficiency, or * on account of physical disability attributable to Military Service, or * on invalidment. f. upto a maximum of 5 years in the case of ECOs / SSCOs who have completed an initial period of assignment (5 years Military Service) as on August 1 of the year of examination and whose assignment has been extended beyond 5 years. Such candidates will have to provide a certificate from the Ministry of Defence stating that they can apply for civil employment and they will be released on a notice of 3 months, upon selection, from the date of receipt of offer of appointment.
g. upto a maximum of 10 years in the case of blind, deaf-mute and orthopaedically handicapped candidates.
a man made satellite is a satellite made by man, and sent into space to orbit around a planet, star, or other body in any solar system to gather information and pictures about it.
