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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 diameter of a blast hole and the effective diameter of a blast?

Holes for blasting vary in size from an inch to several inches depending on the application. Depth will vary across applications as well. The effective diameter of a blast will depend on the size of the charge, the depth in which it is placed and the type of material that is being blasted. And all of this will vary as widely as the application. In commercial mining applications, it is unusual to make a single hole and pack a single charge to make a shot. This ups the challenge to estimate the amount of material that will be displaced, but the professionals who do this blasting can make these estimates.

What are the applications of x ray crystallography?

It is mainly used to predict arrangement of atoms within large biological macromolecules.
It determines X,Y,Z coordinates of all atoms.
It is used to find three dimensional structure of a molcule, so that it can be docked with a ligand molecule.

Why uncharged atoms or molecules never crystallize in simple cubic structures?

Uncrystallized atoms or molecules lack the regular repeating pattern required for a simple cubic structure. Without charges to attract and hold them in place, uncharged particles are unable to align themselves in the precise geometric arrangement needed for crystallization in a simple cubic lattice. Additionally, the absence of charges reduces the forces that could help stabilize the structure, further hindering the formation of a simple cubic lattice.

What is Semiconducting tape which are used in power cables?

Semiconducting tape is a material used in power cables to create a smooth transition between the insulation and the metallic shield. It helps to evenly distribute electric field stress along the cable, reducing the risk of electrical breakdown and ensuring efficient power transmission. This tape is typically made from a special compound that has semiconducting properties to enhance the overall performance and reliability of the cable.

What is a hot plate thermolyne?

A hot plate thermolyne is a type of laboratory equipment used for heating substances in scientific experiments. It typically consists of a flat surface that can reach high temperatures and is commonly used for tasks such as heating solutions or melting solids in a controlled manner.

What are nitra alloys?

Nitralloy

the generic name of a group of structural steels used to manufacture nitrided parts. The main alloying elements of nitralloys are aluminum, chromium, molybdenum, and vanadium, which form fine-crystalline hard nitrides that impart a high hardness (Vickers hardness, up to 1200) and wear resistance to the nitrided surface layer. The most common nitralloys in the USSR are 38KhMIuA and 38KhIu steels. Type 38KhMIuA steel, which is used in the manufacture of critical parts, contains 0.15--0.25 percent molybdenum, in addition to aluminum and chromium. The molybdenum increases hardenability, moderately improves the ultimate strength of the core of the part, and prevents the development of temper brittleness during nitriding.

How do fireworks explode?

Fireworks are designed with an enclosed shell containing an explosive compound along with chemicals that produce colors and effects. When the fuse is lit, it ignites the explosive compound, causing rapid expansion of gases that create enough pressure to break the shell and release the colored particles in the sky. The specific combination of chemicals and timing is what creates the visual and auditory display we see.

How much water is in sludge from a sewage treatment plant?

The water content in sludge from a sewage treatment plant typically ranges from 70% to 98%, depending on the type of treatment process used and how dewatered the sludge is. The remaining percentage consists of solids, which can include organic matter, inorganic materials, and pathogens.

What is the design temperature and humidity data in Kampala?

The design temperature in Kampala, Uganda is typically around 25-27 degrees Celsius, with humidity levels ranging from 70-80%. These values are used as reference points for building design and HVAC system sizing.

What is the formula to determine the btu's needed to heat a garage?

The BTU, or British Thermal Unit, is a unit of energy, worth about 1055 joules. BTUH is a non-systematic abbreviation standing for British Thermal Units per Hour. You could take a total amount of energy in BTU and divide it by the time over which it is produced (or used) to get BTUH. However, you are not converting one to another as BTU is a measure of energy and BTUH is a measure of power.

Why to use a converging and diverging nozzle in a steamturbine?

I tried to answer this question 4 times but WikiAnswers won't accept the code word to submit it, even though it is correct all 4 times. Converging / diverging nozzles are used with compressible fluids (gases, including steam) to increase their velocity. The converging section (cross-sectional area decreasing in the direction of flow) increases the velocity until it reaches the velocity of sound in the gas (sonic velocity - "Mach 1"). At that point, further reduction in area would slow the gas down, but increasing the cross-sectional area in the direction of further flow allows the gas to expand and increase its velocity to supersonic. If you only had a converging nozzle the maximum speed of the gas could only be subsonic or sonic. The diverging portion of the nozzle needs to be added to achieve supersonic speeds. The converging-diverging nozzle (also known as DeLaval nozzle) is used in steam turbines, most if not all rocket engines and all supersonic wind tunnels.

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Actually, gas flowing though a diverging nozzle LOSES velocity but gains pressure, and it is pressure in the impinging stream the turbine needs, not its velocity.

Give three reasons why it is difficult to identify a mineral by its color alone?

  1. Different minerals can have similar colors, making it challenging to distinguish them.
  2. The same mineral can come in various colors due to impurities or variations in its chemical composition.
  3. Color can be affected by external factors such as weathering or lighting conditions, leading to inconsistencies in identification.

What is the solubility of cerium oxide?

The solubility of oxides and other ceramic powders depends on what the solution and solvent should be. Temperature is also important. For example one definition of glass says that it is solid solution of natrium oxide, kalium oxide and silicium oxide. many kinds of steel are similarly defined as "interstitial solid solution of carbon in alpha-iron", etc.

As for the solubility of metal oxides in water, it is close to zero. The same for alcohols, ethers, alkanes, etc. The usual way of getting metal oxides into liquids is to mix suspension so fine that the powder will be hard to separate due to the brownian motion and such. Today you may order nano-powder as well.

Now to the point why somebody asked this: the cerium oxide is inert. The point when it becomes interesting is at higher temperatures when it can oxidize carbon for example at temperature much lower than the carbon will usually burn. Another useful property is that it will reduce nitrogen oxides and take the oxygen to form its ceric oxide state. This is used in car catalysts due to good efficiency and favorable price. Yet another use - which can be derived from wikipedia information already is chemical reaction with laughing gas - N2O to form really strong, orange oxidiser (forgot the name). I plan to test it in a rocket engine fuel soon.

Just to note - many combustion processes, whether in furnace, cars, rockets can not be enhanced, taken more power from them, because of the limited speed of reaction. That is where catalysts take place. Ceric oxide can act as a catalyst. When reacted with certain nitrous oxides it can take form of another chemical composition which acts as a strong oxidiser potentially increasing the speed of the reaction even further.

The maximum surface area of ceric oxide nano-powders ranges from 35-70 square meters per gram of the powder. Ordinary polishing powders do not have such large surface area since they are aimed for polishing, not as a catalyst.

P.S. if you really want more answers than this, ask me at http://zumotor.blogspot.com/

Explain the effect of trim in ships on tank soundings?

Trim in ships refers to the difference in draft between the bow and stern of the vessel. When a ship has a trim, it can affect the accuracy of tank soundings because the liquid in the tanks may not be level due to the sloping nature of the ship. This can lead to misleading readings and potential errors in estimating cargo quantity. It is important for crew members to account for trim when taking tank soundings to ensure accurate measurements.

If the mass of a quantity of water is 32.7grams what is its volume in cubic centimeters?

The metric system make this very easy; One gram of water occupies one cubic centimeter = one centimeter cubed = one millilitre, one kilo occupies one litre and one metric ton, 1000 Kgs occupies one cubic meter. So in your case; 32.7g of water has a volume of 32.7 cubic centimeteres (can be written as 32.7 cc and is the same as 32.7 cm3 and 32.7 ml ) Very specifically, the 1 g = 1 cm3 equality only applies at 4ºC (degrees centigrade), the temperature at which liquid water is densest.

What are electrodes?

Electrodes are electrical conductors used to connect a non-metallic part of a circuit to a metallic part, allowing electric current to flow between them. They are commonly used in batteries, electrochemical cells, sensors, and medical devices to facilitate the transfer of electrons.

How do you make hollow plastic ball?

Hollow plastic balls are typically made using a process called rotational molding. In this process, a mold is filled with plastic resin, heated, rotated to evenly distribute the resin, and then cooled to form the shape of the ball. The final product is a hollow plastic ball that can be used in various applications.

Characteristics of metal?

Hard, shiny, silver/grey/black/white colour, some conducts electricity, some doesn't, hard to bend, different melting points, different chemical build up, coins made from copper and silver, insoluble in water.

What are the types characteristics features functions and structures of a desert ecosystem grassland ecosystem and aquatic ecosystem?

Desert ecosystem: Characterized by low rainfall, extreme temperature variations, and sparse vegetation adapted to drought conditions. Common features include cacti, succulents, and hardy animal species like snakes and lizards. Functions include soil stabilization, water conservation, and unique plant adaptations such as deep root systems or water storage tissues.

Grassland ecosystem: Characterized by vast open spaces with grasses as the dominant vegetation. Common features include grazers like bison or antelope and burrowing animals like prairie dogs. Functions include carbon sequestration, support for biodiversity, and habitat for native bird species.

Aquatic ecosystem: Characterized by the presence of water bodies such as oceans, lakes, rivers, and wetlands. Common features include aquatic plants, fish, invertebrates, and aquatic mammals like dolphins. Functions include nutrient cycling, oxygen production, and providing habitat for a diverse range of species. Structures can include coral reefs, kelp forests, and estuaries.

How does surface area affect temperature?

Surface area does not really affect temperature. It affects heat transfer. A car's radiator has thousands of fins that increase the surface area to increase heat transfer between the air and water. The radiator is a heat exchanger that follows the rules found here

Based on heat transfer, surface area can indirectly affect temperature. If your house is surrounded by a paved road the temperature will not be as warm as if it were located in the center of a huge parking lot. The larger parking lot area can convert more radiant energy from the sun and release more to the air surrounding your house.

What do chemical engineers do?

Using the principles of biology and chemistry, environmental engineers develop solutions to environmental problems. They are involved in water and air pollution control, recycling, waste disposal, and public health issues. Environmental engineers conduct hazardous-waste management studies in which they evaluate the significance of the hazard, offer analysis on treatment and containment, and develop regulations to prevent mishaps. They design municipal water supply and industrial wastewater treatment systems. They conduct research on proposed environmental projects, analyze scientific data, and perform quality control checks.

Environmental engineers are concerned with local and worldwide environmental issues. They study and attempt to minimize the effects of acid rain, global warming, automobile emissions, and ozone depletion. They also are involved in the protection of wildlife.

Many environmental engineers work as consultants, helping their clients to comply with regulations and to clean up hazardous sites.

What is a flight engineer?

In aviation, a flight engineer is a member of the aircrew of an aircraft who is responsible for checking the aircraft before and after each flight, and for monitoring and operating aircraft systems during flight. The flight engineer usually has a background in aircraft maintenance and may reasonably be described as the "technical expert" member of the operating crew.

What are the different kinds of fuels?

Coleman® Fuel

Also called white gas or camping fuel, you can't beat it for camping in the winter or at high altitude. Burns hot even at subzero temperatures. And unlike butane and propane, output doesn't falter as temperatures drop. Coleman® Fuel is very refined, and burns hotter and cleaner than other liquid fuels. It's relatively inexpensive and not difficult to come by. By carrying the fuel in small refillable fuel bottles, you don't have the disposal considerations you do with empty propane or butane cylinders. But unlike appliances that use those fuels, you do need to fill liquid-fuel appliances. And for steady output, they need to be pumped occasionally to maintain pressure within the fuel tank.

Main advantages: heat output and economy.

Butane/Propane Fuel

Butane/Propane mix canisters are lightweight, resealable, and easily connect to stoves and lanterns. Most canister appliances are lightweight and simple to use, so if you are a backpacker who counts ounces and appreciates convenience this fuel is for you. Downsides are that canisters can't be recycled, and in subfreezing temperatures, the fuel does not perform well. Or at all. Cold temperatures affect the pressure in the canister, so performance is best in mild to moderate conditions, You'll find this fuel in specialty and sporting goods stores under several brand names.

Main advantages: convenience and light weight.

Powermax™ Fuel

Coleman's exclusive high-performance butane/propane blend dramatically extends the operational range of backpacking appliances. High altitude and incredible cold don't phase this fuel. It's delivered via a liquid withdraw system that ensures consistent output, even when the fuel level in the canister is low. No fighting the drop-offs you get with propane and butane canisters, which rely on vapor pressure. Each Powermax™ cartridge has a resealable connection so that you can detach the cartridge to pack it, then reattach it later. No fuel goes to waste. And canisters are recyclable. You'll either need to look for Powermax® Fuel in specialty and sporting goods stores, or purchase it from mail-order and on-line retailers.

Main advantages: Four-season performance and lightweight, recyclable canisters.

Unleaded Gasoline

Our DualFuel™ appliances are made to accommodate automobile fuel. Coleman's modified valving even allows for differences between summer and winter blends. At 1/10 of the cost of propane, unleaded gas is the cheapest of all appliance fuels. And it's available everywhere, of course. In an emergency, you can siphon gas from the tank of your RV or car to use in a DualFuel lantern or stove. Although it's the most economical fuel to use, you'll extend the life of your appliance by using purer Coleman™ Fuel most of the time.

Main advantages: availability and low cost.

Kerosene

Used less now that other fuel options are available, kerosene is economical to use, readily accessible and dependable. Disadvantages are that it's smoky and has a strong smell. Also, kerosene appliances do require priming with a preheat fuel.

Is Microsoft PowerPoint included in Basic Windows Vista?

PowerPoint is part of Microsoft Office, which you have to pay for, so it is separate from Vista or XP or any other operating system.

Basic Windows Vista is rubbish anyway and you shouldn't get it, if you want Vista make sure you get at least Home Premium edition or you're just wasting your money.

If you just want PowerPoint, you can either buy Microsoft Office (availably in all good computer shops, as well as online shops like Amazon, Play.com, etc), or you can get a similar free alternative called OpenOffice.Org, which has a free version (its all available to download from www.openoffice.org)

Is NISA Analysis software good for doing analysis?

As of my last update in January 2022, I don't have specific information about "NISA Analysis" software. However, the effectiveness of any analysis software depends on various factors such as its features, ease of use, accuracy, reliability, customer support, and compatibility with your specific analysis needs.

To determine if NISA Analysis software is suitable for your analysis tasks, you may consider the following:

Features: Evaluate whether the software offers the specific analysis tools and capabilities you require for your projects. This could include finite element analysis (FEA), computational fluid dynamics (CFD), structural analysis, thermal analysis, etc.

User-Friendliness: Determine if the software interface is intuitive and easy to navigate. Complex analysis tasks can become cumbersome if the software interface is overly complicated.

Accuracy and Reliability: Look for reviews or testimonials from users who have experience with the software to assess its accuracy and reliability in delivering accurate analysis results.

Technical Support: Consider the availability and quality of technical support provided by the software vendor. Prompt and helpful support can be crucial in resolving any issues or questions that arise during your analysis projects.

Cost: Evaluate the cost of the software and whether it fits within your budget. Additionally, consider any additional fees for maintenance, updates, or support services.

Compatibility: Ensure that the software is compatible with your operating system and any other software or hardware you may need to integrate with for your analysis tasks.

Before making a decision, it's often helpful to request a demo or trial version of the software to test its features and suitability for your specific analysis requirements. Additionally, seeking feedback from peers or industry professionals who have used the software can provide valuable insights into its effectiveness.