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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

What is the difference between SDV and ESDV?

The construction and accessories of Shutdown Valve (SDV) and Emergency Shutdown Valve (ESDV) are similar. What is the basis to distinguish their name?

Their name is distinguished only from their services. Shutdown Valve referred to actuated valve which is closed during partial or total process shutdown of system to which the valve protects. Emergency Shutdown Valve is actuated valve which is closed when triggered by signal from ESD level signal during emergency condition occurs.

Emergency Shutdown Valves are commonly located in incoming line and outgoing line of the plant or platform.

How does length and initial angle affect the period in a simple pendulum?

The longer the pendulum is, the greater the period of each swing. If you increase the length four times, you will double the period.

It is hard to notice, but the period of a pendulum does depend on the angle of oscillation. For small angles, the period is constant and depends only on the length of the pendulum. As the angle of oscillation (amplitude) is increased, additional factors of a Taylor approximation become important. (T=2*pi*sqrt(L/g)[1+theta^2/16+...] and the period increases. (see hyper physics: http://hyperphysics.phy-astr.gsu.edu/hbase/pendl.html)

Interestingly, if the pendulum is supported by a very light wire then the mass of the object at the end of the pendulum does not affect the period. Obviously, the greater the mass, the less any air friction or friction at the pivot will slow the pendulum. Also interestingly, the pendulum period is dependant on the force of gravity on the object (g). One must not assume that g is constant for all places on Earth.

How difficult is Navy Nuclear Power School compared to Caltech or MIT?

There is no question that Navy Nuclear careers are much more difficult than anything civilian training can provide. It's a fact that most civilian reactors are in fact operated by former Navy nuclear-trained personnel.

Naval Enlisted NPS is not easy - unlike a traditional school, in addition to book work and study, you're also required to stand watches and learn reactor operations, maintenance, repair, etc. for your particular area of skill (Electrician, Electronics, Machinist) on an operating reactor. This is why NPS graduates quickly qualify as watchstanders on the ships/submarines they report to - they're already qualified on the systems.

The Navy's program is also a lot more accelerated - remember that in a traditional school, you're not just learning Nuclear Power. You're also stuck with all of the other things a traditional degree entails.

For those lucky enough to go to the Naval Academy, you'll get a degree and the opportunity to train as an Engineer Officer should you choose to go through that career path leading to command of a ship or submarine that is nuclear powered. Such careers are much more prestigious than any traditional degree can afford, but it takes a lot of dedication and much more hard work than any traditional school. The term "Failure is not an Option" is also key on Nuclear Powered Navy ships - a single mistake made by an officer, however small, concerning anything in the reactor or engineering spaces is enough to end that officer's Naval career. I've seen it happen twice during my own Naval tours. The Navy many operational reactor years of experience, and with an exceptionally safe record. It remains that way because it does not tolerate mistakes. You won't see that same discipline in the civilian industry.

What are poor design process?

Poor design processes would be where the design doesn't meet the specification and requirements agreed with the customer. If the customers needs aren't met then that forms bad relations with said customer

Is pulley and flywheel the same?

Fly wheel and pulleys are two different parts. The use of fley wheel is storing energy from rotationam motion, however pulley is used to transmit energy to an other part by belt

What is the difference between parity and non-parity memory?

Non-parity memory is memory without parity. Parity memory is memory with extra bits, sometimes one, sometimes more, that accompany the word. These extra parity bits are generated to a known value, typically to make the total number of bits on that word even or odd. When the word is retrieved, the parity bits are compared against what they should be. If they are different, then one or more of the bits in the original word or in the parity bits must have changed. This is an error condition that can be trapped. In a multiple parity bit system, the calculation of the bits allows not only for the detection of a changed bit, but also for the identification of which bit changed. This is known as ECC parity, or Error-Correcting-Code. Often, you can detect and correct any one bit error, and you can detect, but not correct, any two bit error. Since random bits changes are rare, those that do occur are usually one bit errors, making ECC parity valuable for high reliability systems such as servers.

What were some Nazi scientific discoveries?

Most Nazi scientific efforts were guided by military considerations, they were especially fruitful in the areas of rocket propulsion, jet propulsion, and missile guidance. To name a few:

V-1: The first operational, powered, UAV (Unmanned Air Vehicle), first pulse-jet-propelled air craft, first cruise missile.

V-2: The first operational, short range, ballistic missile. It achieved sub-orbital space flight at an altitude of approximately 80 km.

Rheinbote: The second operational, short range, ballistic missile, designed to replace or augment large bore artillery pieces.

Ruhrstahl X-4: The first wire-guided ATA (Air-To-Air) missile, developed & tested, but never deployed.

ME163: The first operational, manned, rocket-propelled air craft.

ME262: The first operational, manned, jet-propelled air craft.

Der Wasserfall (The Waterfall): The first developed, but never deployed, rocket-propelled STA (Surface To Air), guided missile. Today it would be called a SAM.

Henschel Hs 293: The first operational, Anti ship, Rocket-propelled, guided missile (It began as Fritz X, a stand-off, radio-controlled, gliding bomb (also, a first); then the engine was added to allow low altitude delivery and to increase range and stand-off distance.)

Henschel Hs 293D: As above, but television guided (never deployed).

Which inventors changed agriculture with machines that worked well on midwestern prairies?

Cyrus McCormick and John Deere changed agriculture with machines that worked well on midwestern prairies.

What is the split nut in lathe?

The split nut, also known as half nut enables thread cutting on a lathe. It is engaged around the lead screw (which is housed in the apron attached to the saddle) and moves the saddle in the required direction at the required pitch.

What is the function of cyclone in cfbc boiler?

cyclone is used for to recycle the unburnt and heavy particles into com-buster

Do the benefits of technology outweigh its costs and potential dangers?

Humans cannot survive without the technologies that they created. However a costs/benefits analysis is usually appropriate when introducing any new technology, as in many cases several different technologies may be available to satisfy a given human need.

What is the product ID number of visual basic 6.0?

It seems like you have lost your product id number. Same thing happened to me.

You can simply type 111-1111111 in the checkbox and continue. It has worked for me, hope it will work on your setup too.

Can a boeing777 land on autopilot?

YES! ANY modern airliner can land on autopilot as long as the airport has a ILS (instrument Landing System) The pilot/s would tune in the ILS frequency to NAV 1 module and then engage autopilot and select the APP or APR button, this will keep the plane on the connrect glideslope and flightpaff. all the pilotsb have to do is adjust power acordingly and operate the flaps

What is coke-drum unheading?

Coke drum unheading in general can be explained as follows.When coke is being formed in the coke drum the unheading is a means of isolating the drum from the decoking device.After coking process is complete the unheading devices ( at top and bottom of the drum ) are opened and by hydraulic or other means the coke formed is separated from the drum and further handled and conveyed.The drum is again ready for coking and the unheading devices are closed. The process of coking and decoking are batch processes and take place over a period of about 24+ hours in the ratio of about 20+ hours of coking and 2 or 3 hours of decoking.

Why is dumpy level known as dumpy level?

It is named so because of the shorter telescope it uses and also because in the original dumpy level the eye piece was an inverting lens such that it gave a shorter view for the same power of lens compared to wye level.

What are the top 100 corporation of the Philippines?

The business industry in the Philippines is competitive and the list keep vary with each passing year. Some notable corporations include ON Semicon (Philippines) Inc., Mitsubishi Motors Philippines Corporation, Pilipinas Shell Petroleum Corporation, Fujitsu Computer Products Corporation of the Philippines, Caltex Philippines Incorporated, Manila Electric Company, Mercury Drug Corporation, Globe Telecom Incorporated, Smart Communications Incorporated among many others.

What are flat files?

In database management, a flat file is one that holds all the information in a single table.

By contrast, a relational database has two or more tables having a defined relationship to each other.

A flat file is not related to any other table.

Examples

Flat file

You could keep details of a DVD collection in a flat file. Some of the fields might be:

title

date purchased

length

year issued

Relational database

A retail business might have a database with three tables:

products [one record for each type of item for sale]

customers

products&customers [each sale constitutes a record in this table. The table is related (linked) to each of the other two tables]

Tables and files

"Table" is a database term, "file" a computer term. Some database management programs make each table into a separate file. Others store all the tables in a single file.

How much do quantity surveyors earn?

a client's quantity surveyor will act on behalf of the client to ensure value for money and check the accuracy of the relevant contractors applications for payment. The building contractors quantity surveyor will be responsible for the appointment of sub contractors accounts and ensuring that there applications for payment are reasonable and accurate and also dealing with any variations that occur. Also the contractors QS will have to submit applications for payment to the client in line with the dates agreed in the original contract.