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Mechanical Engineering
Mechanical Engineering is a branch of engineering that encompasses the generation and application of heat and mechanical power and the design, production, and use of machines and tools. Mechanical engineering involves application of the principles of dynamics, control, thermodynamics and heat transfer, fluid mechanics, strength of materials, materials science, electronics, and mathematics.
10,989 Questions
well, 100 gallons at 3000 psi is 3333 gallons at 90 psi, which is 443 cubic feet, or 110 minutes. However, most air tools are rated for cfm's at atmospheric pressure, which is 14.7 psi at the surface, so 2714 minutes. This is average usage, not continuous, but still quite a long time. Now, if you go down 33 feet, the pressure doubles, so you have to cut the time down - the actually calculation is hazy, as the ambient pressure doubles, but the pressure differential does not - however, you will need to increase the pressure going to the tool by 15 psi for every 30 feet of depth, or else it won't work right.
Would a bullet ricochet on a steel target?
Yes, provided the target is not thin enough to be penetrated. You should shoot at paper targets in a designated shooting range.
exhibiting equality in dimensions or measurements of water
Define the engineering model of stress?
The Engineering Model of Stress was one of the first models to be introduced; stress is a force that acts upon the individual and when it gets too much for that person they will 'snap.' Just as a bridge would fall down with too much weight, it is the same with a human body.
Top 10 colleges in trichy for MBA?
1.BIM
2.st Joseph institute of management
3.saranathan college of engineering
4.oxford engineering college
5.Holly cross institute of management
6.J.J. College of Engineering and Technology
7.Urumu Dhanalakshmi College, Tiruchirappalli (Trichy)
8.Centum Learning Limited
9.Aakson Group of Institutions
10.AAM- The Pragmatic B School
What is the difference between end suction pump and horizontal multi stage pump?
what is th different between end suction pump and singl stage pump and multistage pump
Watch this video and discover how: http://www.wimp.com/trainsstay/
Formation integrity test leak off test oil and gas terms?
the most sensitive method for a quantifiable leak test depending on the service of the system.
How do you set up a catapult to get the maximum distance possible using one elastic bungee cord?
Release the projectile at a 45 degree angle.
A PITO tube is used to measure airspeed of the plane. The covers are put over the tubes when the aircraft is going to be on the ground for an extended period of time, and are removed before takeoff. They are there to prevent tube blockages, leading to airspeed failure, which (and it has happened) could mean a possible accident.
vhdl-v stands for vhsic...that is very high speed integrated circuit...and hdl means hardware description language
Introduction to VHDL
Full form :-
Very high-speed integrated circuit hardware description language
INTRODUCTION:
VHDL stands for very high-speed integrated circuit hardware description language. Which is one of the programming language used to model a digital system by dataflow, behavioral and structural style of modeling. This language was first introduced in 1981 for the department of Defense (DoD) under the VHSIC programe. In 1983 IBM, Texas instruments and Intermetrics started to develop this language. In 1985 VHDL 7.2 version was released. In 1987 IEEE standardized the language.
http://www.electronicsgyan.com/introvhdl.aspx
Up against the firewall on the driver side. Look for the small barrel that has a vaccuum line attached to it.
When using pressure treated wood you should look for a screw specifically rated for use in ACQ (pressure treated) lumber or use stainless steel.
The greed coating may be an ACQ coating but you would have to check the package.
You should NOT use zinc deck screws as the copper content in ACQ lumber will react with it causing the screws to corrode.
How do you set the pressure in a sears pressure washer 580.752410?
Without getting overcomplicated, the amount of pressure coming from a pressure washer is a function of the amount of flow (gpm) and the resistance to that flow created by a nozzle. (more happens inside the pump but is not relevant to the poster's question. If you want a lower pressure, you would need to use a larger orifice nozzle. Larger orifice means less resistance and therefore less pressure. Professionals carry a large amount of nozzle sizes to vary the pressure for individual jobs. Note: The color of the nozzle does not indicate orifice size. The various colors, usually white, green, yellow and red, indicate the spray pattern. White being the broadest spray pattern and red being a very focused stream.
What kind of pipes are used for steam lines?
Heavy weight mild steel with screwed fittings bspt. == Normally galvanized pipes are not used for steam. Mild steel with screwed or welded fittings are the norm. Pressure and temperature are very important factors to be considered in what type of materials to be used. Steam even at low pressures can be extremely dangerous. Answer In hign temperature application nomally the alloy steel pipes are used ANSWER: Mild Steel Seemless pipes, thickness dependent on the pressure rating to be used.
What are the main cause of starting air line explosion at marine engine?
The source of ignition for these explosions can be attributed to one of the following:
A leaking air start valve. Whilst the engine is running, the hot gases produced as the fuel burns in the cylinder (at above 1200°C) leak past a valve which has not re-seated correctly. The branch pipe to the air start manifold heats up to red heat. If the engine is stopped and restarted before the pipe has time to cool, any oil vapour in the air can be ignited and an explosion can result if the mixture of oil/air is correct.
Fuel leaking into the cylinder whilst the engine is stopped. When the engine then undergoes a start sequence, and builds up speed, the fuel which has leaked into the cylinder vaporises and the heat from the compression of the air in the cylinder, as the piston rises, ignites the fuel. When the air start valve opens as the piston comes over TDC, the pressure in the cylinder is higher than the air start pressure, and the burning combustion gases pass to the air start manifold, igniting the oil entrained in the air.
A recent theory by ClassNK has concluded that the principal cause of explosions in starting air manifolds of marine engines is probably the auto ignition of oil deposited on the inner surface of the manifold, not backfire from cylinders as previously thought. Auto-ignition conditions occur because of the high temperature generated by the rapid inflow of high-pressure air, says the research. This incoming air compresses air downstream of the main starting valve, causing its temperature to reach as high as 400°C which in some cases causes oil deposits in the manifold to self-ignite leading to an explosion. ClassNK has adapted its safety requirements for a starting system to account for the findings. It now requires the fitting of rupture discs to the manifold on engines with a flame arrester in each branch pipe leading to the cylinders. This is beyond IACS unified requirements, which account for cylinder backfire as the cause of starting air manifold explosions.
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To minimise the risk of explosions, the oil carry over from the compressor should be reduced to a minimum. Class regulations require that the air compressor's air intakes are located in an oil-free atmosphere, and a drain/filter for intercepting oil/water mist is fitted between compressor discharge and air receiver. There must be complete separation of compressor discharge and starting air supply to engines at the receiver which is fitted with a drain and a relief valve.
The air start system must be protected with a non return valve at the starting air supply to each engine. This is normally part of the automatic valve which opens when an air start is initiated.
In addition to this IACS require that:
For direct reversing main engines >230 mm bore flame arresters or bursting discs are required for each cylinder fitted between the cylinder start air valve and the manifold.
For non-reversing and auxiliary engines >230 mm bore a single flame arrester or bursting disc is acceptable fitted at the supply inlet to the starting air manifold.
Although not part of IACS regulations, a relief valve may be fitted to the manifold where flame arrestors are used instead of bursting discs.
Unsatisfactory practices which have led to explosions in the air start system include:
'Tell tales/drains' at each end of the starting air manifold found to have been blanked off with screwed plugs.
Failure to drain starting air receivers and starting air pipes at regular intervals or before manoeuvring.
Failure to check for leaking air start valves.
Failure to maintain starting air valves and systems strictly in accordance with manufacturers recommended practices.
Failure to maintain fuel valves correctly.
Economics of quality - COQ and VOQ?
The management of quality keeping at par the cost of the organization involved is referred to as the economics of quality. It is associated with the appraisal of the product quality and at the same time ensuring maximum return for the concerned organization. The earlier concept of 'economics of quality' strived towards assuring a minimum level of quality which resulted in reduced investment and thereby increasing profitability. However the modern concept of 'economics of quality' focuses at attaining an optimum level of quality with the available resources and funds and thereby increasing the overall profitability of the organization.
The process of 'Economics of Quality' involves identification of quality affecting parameters and regulating them a manner to achieve an optimum level of quality at which the overall profitability of the organization is maximized.
1. chassis and body
2. engine
3. fuel system
4. cooling system
5. ignition system(for s.i engines)
6. electric system
7. transmission system
8. steering system
9. suspension system
10. braking system
11. emission
How much fuel does Airbus A320 aircraft consumes per hrs in litres?
Approx 2200 kg per hour ..... Divide by .8 for litters
What are the advantages and disadvantages of knife edge?
disadvantage: concentrated stress on tip results in increased wear, in turn the follower becomes less accurate over time
big boom, that what happen
Which gear turns faster if the driving gear is larger than the driven gear?
according to velocity ratio i.e
N1/N2 = D2/D1
which implies that diameter of gear is inversly proportaional to speed .
hence, DRIVEN GEAR will move faster as it is smaller in size than the DRIVING GEAR
What are the functions of Total productive maintenance?
to meet the client satisfactions and to insure that all equipment are in good running condition, to prevent loss of quantity of production,, and to have more accurate reports on when or when this equipment will get damage or to give information on the status of the machine,, for future reference,,and carry all standard procedures for the maintenance of equipment
