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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

Why are hexagons used as the basic cell shape?

If you analyze the way bees construct the honeycomb, the hexagonal structure gives the greatest strength and the largest number of cells in a given area using the least amount of wax.

Who is Bruce ellison recording engineer?

Well known Recording Engineer 1963 to 1977 Hollywood Ca. Worked with Marvin Gat, Smokey Robinson, Jackson 5, Five Man Electrical Band. Nitty Gritty Dirt Band, Caned Heat. Ower Glass and many more...

What are two ways to increase the amount of thrust a rocket produces?

If the mass flow rate through the rocketâ??s engine is increased, then the thrust will be higher. Another way to increase the thrust amount is to increase the exit or initial velocity during takeoff.

Why PRDS used in thermal power plant?

they work parallel to power generating turbines. The only difference between prds and turbine is that prds give only process steam by simply reducing the pressure of incoming steam while a turbine generates power out of that pressure reduction, and also give left out steam as process steam.

Why is stainless steel dangerous to weld?

stainless steel contains chromium. chromium gives off toxic fumes when heated.

Why demin water water PH kept high?

It is normaly due to sodium leakgae out of the cation resin bed .

Why do you want to join in banking sector being a engineering graduate?

During my engineering i am not much career oriented,but after my graduation i am having a tremendous interest in banking due to my family background.Apart from that since banking is a back bone of any country,so i really want to be part of it.As banking offers tremendous growth opportunity.Bank employee have respect in society,since there is direct interaction with customers.one of the major reason is job security especially in public sector bank.Last but not the least banking provides challenging work environment.

What is the difference between should be and to be?

the difference is obvious, You should be a bride or you are to be a bride. (should=could (sorta) and to be = you will be.

If you observed the solar system from the nearest star 1.3 parsecs what would the maximum angular separation be between the earth and the sun?

The distance of Proxima Centauri is about 4.4 light years ... roughly (186,252 mi/sec times 31,536,000 sec) = 2.469 x 1013 miles. Taking the earth's average distance from the sun as 93,000,000 miles, the visual apparent maximum angular separation at the distance of the Alpha Centauri system is tan-1(9.3x107/2.47x1013) = tan-1(3.77x10-6) = 2.16x10-4 degrees = 0.78 arc seconds Granted, these numbers are all very rough, but the answer is certainly good to within less than an order of magnitude. From the distance of even the nearest star, you'd have to be pretty clever to detect the presence of planets bound to the sun.

Is computer science better now?

no , not yet . and it takes some time to recover. compare to computer science it is best to choose mechanical or civil or chemical

What is pulsed mig?

In welding technology a Pulsed MIG is a touchless transfer method concerning the electrode and the weld puddle, completed by forming one droplet of metal at the end of the electrode per pulse. Just the right quantity of current is added to drive that one droplet across the arc and into the puddle.

Why is the lac regulatory system important to bacteria?

The lac regulatory system is a vital part of the bacteria. This is because, the most common source of food is sugar lactose and it is required by the enzymes all the time.

What is International Gravity Formula?

how is the formula of (1+0.005279sin^2+0.000023sin^4) come from and what is a complete form of this formula?

please answere

What have engineers done in the past?

They have built pacemakers, artificial joints, prosthetic limbs, polymer substances, and various other medical progressions. Less importantly, engineers have created cars, buildings, bridges, etc. In a sense, everything you see is either the direct product of an engineer or is made of the materials that an engineer produced.

What type of micrometer is easiest to read?

A digital micrometer is the easiest to read as it displays the exact reading on a screen.

What will happen when a stone is thrown from a moving train?

Throwing a stone from a moving train involves the same type of calculations as throwing a stone from a stationary platform. The difference is that you now consider the added horizontal velocity imparted by the moving train. If you throw forward, the train's velocity is added to your contribution to the stone. If you throw backward, the train's velocity is subtracted from your contribution to the stone. If you throw sideways, the train's velocity does not alter your contribution to the stone. Whether any of this matters or not depends on friction due to the different air velocities encountered by the stone. Vertical velocity is relatively unchanged by the train's contribution. The stone will still go up (if you include an upward vector in your throw) and it will still go down. The end result is that the stone will hit the ground at some point. That point will be relatively the same in both cases, except for the minor difference due to air velocity.

What are the advantages and disadvantages of personal area network?

Advantage is PAN users can move without much concern of their mobile devices I/O redundancies. Disadvantage is the PAN has limited transmission range about 10 meters.

Comparative chart for 1G 2G 3G and 4G GSM technology?

Dates

Cool New Features

1G

70's to 80's

Wireless phones (cellular) are introduced, primarily for voice only.

2G

90's to 2000

Increased performance achieved by allowing multiple users on a single channel. More and more cellular phones are used for data as well as voice.

2.5G

2001-2004

The Internet turns the focus towards data transmission. Enhanced multimedia and streaming video are now possible. Phones support limited web browsing.

3G

2004-2005

Enhanced multimedia and streaming video capabilities are increased. Standards are created to allow universal access and portability across different device types (Telephones, PDA's, etc.)

4G

2006+

Speeds reach up to 40 Mbps. Enhanced multimedia, streaming video, access and portability are increased still further. Devices are equipped for world-wide roaming.

Technology

1G

Analog

CMRT

AMPS

2G

Digital Circuit Switched

D-AMPS

GSM

CDMA

2.5G

Digital Packet Switched

GPRS

EDGE

3G

Digital Packet Switched

UMTS

W-CDMA

CDMA2000

4G

Digital Broadband

802.11

Data Rate

1G

9.6 Kbps to 14.4 Kbps

2G

D-AMPS

9.6 Kbps to 14.4 Kbps

GSM

9.6 Kbps to 14.4 Kbps

IS95A

9.6 Kbps to 14.4 Kbps

IS95B

115 Kbps

2.5G

56 Kbps to 144 Kbps

3G

UMTS

2+ Mbps, up to 384 Kbps

WCDMA

384 Kbps (wide area access), 2 Mbps (local area access)

CDMA2000

614 Kbps

4G

20-40 Mbps

Frequency

Carrier

1G

800 MHz

30 kHz

2G

D-AMPS

800 MHz or 1.9 GHz

30 kHz

GSM

800 MHz or 1.9 GHz

200 kHz

IS95A/B

800 MHz or 1.9 GHz

1.25 MHz

2.5G

800 MHz or 1.9 GHz

200 kHz

3G

UMTS

2 GHz

5 MHz

WCDMA

2 GHz

5 MHz

CDMA2000

2 GHz

1.25 MHz / 3.75 MHz

4G

In Development

In Development

Primary Countries

1G

Worldwide

2G

D-AMPS

USA

GSM

Europe

IS95A/B

USA

2.5G

Europe, Asia, USA

3G

Europe, Japan, USA

4G

In Development

What is priming in the marine boiler?

Priming is a carryover of entrained water with the steam into the engines that affect the turbine blade, break cylinder heads, piston, valves.

What is the Difference between a Dielectric Test and a Megger Test?

a megger or hipot test involves raising the voltage of the wiring to 2x the operating voltage + 1000v

answer volts/amps or ohms

Dielectric test usually a sample of the oil is taken from the transformer

answer is in ohm-cm

dry devices will have the dielectric tests on file ...

this is a very poor excuse ... the code need rewriting.

the old standards were based on porcelain, oil, paper and cotton AI MI SWC DWC

new types THN THWN THHN SO are generally based on a natural color when the tests are done

so if you replace a cord on a drill the white and green wire has insulation that crumbles while the black is still flexable.

thermoplastic insulation used for several years in damp locations with DC turns to a sticky goo.

Who are the engineers involved in development of xerox machine?

Generally speaking, Xerox relies on several types of engineers to improve existing products or to create new products. For example, Xerox hires mechanical engineers, electronic engineers, chemical engineers and materials science engineers.

Why do you use fins and cone for a bottle rocket?

You use fins and a nose cone on a bottle rocket because the cone reduces the drag on the rocket, and the fins help stabilize the rocket.

Can you die on a roller coaster from like being scared and going on one?

Yes, you die from heart attack or cerebral heamorrage. Scared to death, not real common, but it has happened.