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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
A pure metal is any metal that has not been joined with any other metal or synthetic material.
A pure metal is any metal with a very low content of impurities.
Something that doesn't exist in real life.
A pure metal would be one with absolutely nothing else but that metal in it. You will never see it because metal always has more than one thing in it. Some metals have naturally occurring impurities. Others react with the atmosphere. And still others are a mixture of metals and nonmetals selected for a specific application.
Which liquid freezes faster water or Oil?
Water. Oils become more viscous at lower temperatures but do not solidify until far below zero.
Chemical pumps are intended to move and endure synthetic compounds and substance slurries. They are planned and developed to deal with substances with fluctuating degrees of thickness, destructiveness, and abrasiveness.
How cavitation can be eleminated in a pump?
cavitation is caused when vapour pressure in the fluid in higher equal to the surrronding presure. in the case of centrifugal pump, when the hydraulic pressure (due to height) in the fluid falls below the vapour pressure of the fluid itself, cavitation wil occur.
What is limitation in engineering?
it is a worst course in engineering i have ever known.. :( . it is like the civil engineering but has no much scope all over the world. so i suggest u all not to read this subject. you can prefer civil engineering to it.. you will never have good experience in it.. so better do not prefer this subject..
What is the difference between refurbishment and a normal repair?
Really, semantics for many things. However, it is sort of implied that a normal repair would be to solve a specific problem, while refurbishment combines repair with maintenance or renewal activities.
What is the best university for mechanical engineering?
Massachusetts Institute of Technology (USA)
California Institute of Technology (USA)
Imperial College London (UK)
Georgia Institute of Technology (USA)
University of Glasgow (UK)
University of Tokyo (Japan)
University of Michigan-Ann Arbor (USA)
University of Toronto (Canada)
Stanford University (USA)
Purdue University (USA)
Note:
1) Above ranking is based mainly on research done at those universities, if you are looking for employability then the ranking may change.
2) Aeronautical Engineering Rankings are different from Aerospace Engineering Rankings, above ranking is for Aerospace Engineering.
3) In some cases, e.g, MIT, Stanford etc, there are separate departments for Astronautics and Aeronautics, in such cases ranking is consolidated based on peer reviews.
The best Aerospace engineering college is the Embry-Riddle Aeronautics University, it is referred to the "Harvard" of the aerospace engineering.
What is the Different between TIG arc welding and gas welding?
Gas welding basically used for weaker joints(in sheets) and arc welding for stronger one(plates).
mobile welding (not in a shop)is the ideal time for arc welding . gas welding is the way to go as far as production is concerned , but requires environment with little air circulation or wind , plus gas bottle , machine , and a short lead , which makes it ideal for shop work
answer
Gas welding - generally use for welding of thin plates/pipes. Less heat input and less likely to burn off the edge of the plates (undercut). It is a more expensive process because of gas shielding.
Arc welding - use for thicker plates usually with larger size electrodes. Higher weld production rate. Shielding by means of electrode coating.
Both processes can meet the required mechanical properties usually
What are examples of laminar and turbulent flow?
The Reynolds number, Re = VD/υ, can be used to measure the laminarity of flow. The smaller the Reynolds number, the more laminar the flow. Therefore, to achieve better laminar flow, V and D (velocity of fluid and diameter of pipe) should be small and υ, the kinematic viscosity of the fluid, should be large. Therefore, since pipe diameter and viscosity is fixed in this circumstance, the slower the velocity of the flow, the more laminar the flow. Open the faucet to a small degree and the flow will be laminar. Turn the facet open fully will (for some faucets) cause turbulent flow depending on the maximum velocity of water allowed by the faucet.
What is the definition of a single movable pulley?
Movable pulley is attache to the object you are moving while Fixed Pulley changes direction of the applied force.
LaDy_caRoLi "Christine carren alcantara"
What is the yield stress of a twisted bar as compared to an ordinary mild steel bar?
Tensile yield strength in a steel bar is the amount of pressure exerted before the bar begins to bend. Tensile steel is used for a variety of construction projects.
What is the difference between a closed hydraulic system and an open hydraulic system?
A system which can exchange mass as well as matter with the surroundings is called anopen system.
Example:- Heating of CaCo3 in an open bulb.
A system which can exchange energy but not matter is called a closed system.
Example:- Calcination of CaCo3 in a sealed bulb.
How you will identify the gate valve and globe valve practically?
globe valve. With a spherical valve is closed.
Valves can be closed with a round handle.
What is the symbol of mild steel?
The most widely used mild steel grades are ASTM A36, EN S235JR, JIS SS400, DIN ST37-2, GB Q235B, etc. BBN steel 3w(.)bebonchina(.)com is world class steel materials supplier, the mild steel is one of our main products. If you are interested, please contact sales6(@)bebonchina(.)com.
What are top 500 ranking engineering universities in the world?
1 Massachusetts Institute of Technology (MIT) United States 100.0
2 University of California, Berkeley United States93.9
3 Stanford University United States 85.3
4 California Institute of Technology (Caltech) United States 81.6
5 University of Cambridge United Kingdom 76.2
6 Carnegie Mellon University United States 71.6
7 Imperial College London United Kingdom 70.9
8 Georgia Institute of Technology United States 68.9
9 University of Tokyo Japan 67.4
10 University of Toronto Canada 66.0
11 National University of SINGAPORE(NUS) Singapore64.5
12 Tsinghua University China 63.4
13 Eth Zurich (Swiss Federal Institute of Technology) Switzerland 63.1
14 University of Oxford United Kingdom 61.6
15 Princeton University United States 61.5
16 University of California, Los Angeles (UCLA) United States 61.4
17 Delft University of Technology Netherlands 60.4
18 Mcgill University Canada 60.1
19 Harvard University United States 59.6
20 University of Illinois United States 58.4
21 Tokyo Institute of Technology Japan 57.0
22 Kyoto University Japan 56.8
22 University of British Columbia Canada 56.8
24 Cornell University United States 56.4
24 Hong Kong University of Science & Technology Hong Kong 56.4
26 Nanyang Technological University Singapore 55.2
27 University of New South Wales Australia 54.7
28 The University of Melbourne Australia 54.4
29 Technion - Israel Institute of Technology Israel54.1
30 University of Waterloo Canada 53.9
31 �cole Polytechnique France 52.6
32 University of Texas at Austin United States 52.0
33 Purdue University United States 50.9
34 Kaist - Korea Advanced Institute of Science & Technology Korea, South 50.5
35 University of California, San Diego United States50.3
36 Australian National University Australia 49.9
36 Indian Institute of Technology Bombay (IITB) India49.9
38 Peking University China 49.2
38 University of Michigan United States 49.2
40 Technische Universität München Germany 48.7
41 The University of Sydney Australia 48.0
42 Indian Institute of Technology Delhi (IITD) India47.7
43 Seoul National University Korea, South 46.0
44 Ecole Polytechnique Fédérale de Lausanne Switzerland45.2
45 University of Manchester United Kingdom 44.8
46 University of Alberta Canada 44.6
47 Monash University Australia 44.3
48 Shanghai Jiao Tong University China 43.8
49 Eindhoven University of Technology Netherlands42.3
49 National Taiwan University Taiwan 42.3 49 Osaka University Japan 42.3
49 University of Science and Technology of China China
In what way was the lever used in ancient times?
the ancient Romans used the levers as catapults... this was a class 1 lever!
What are Shape memory alloy made of?
A Shape Memory Alloy is a material that can bend into a shape. When heated it returns to its original shape.
For example: Alloy Glasses, when bent out of shape they can return to their origianal shape when heated.
What material is used for steam turbine casing?
13 Cr steel in one of the papers of Mitsubishi Heavy Industries that i read...
Turbine spins due to mechanical and rotation energy being applied to them. In a wind turbine that energy comes from moving air. Hydroelectric and water mill turbines use the energy from flowing water. Fuel and natural gas can also drive the turbines that generate electricity or provide the thrust needed by aircraft to fly also.
What is direct indexing in milling?
The move directly turbines to be transferred to the Aqaba process.
How do you calculate torque on parallel gear?
Torque = Force x Distance
eg i sit on a bench 2 metres from the left supporting force. I way 60kg. I am then creating a clockwise torque of 60 x 9.8 x 2 (9.8 because that is equal to gravity)
so 60 x 9.8 is my weight force (force) which is 588 Newtons. To calculate torque I then multiply that by the distance of 2 metres. So i would be creating a torque of 1176Nm.
P.S a common misconception is that a scale like the one in your bathroom measures weight. That's wrong, the scale measures mass. Weight is a force and must be measured in Newtons. That is why i multiplied by gravity (9.8). mass x gravity = weight.
What is the effect of silica on steam turbine blades?
Although several factors influence the formation of deposits on turbine components, the general effect is the same no matter what the cause. Adherent deposits form in the steam passage, distorting the original shape of turbine nozzles and blades. These deposits, often rough or uneven at the surface, increase resistance to the flow of steam. Distortion of steam passages alters steam velocities and pressure drops, reducing the capacity and efficiency of the turbine. Where conditions are severe, deposits can cause excessive rotor thrust. Uneven deposition can unbalance the turbine rotor, causing vibration problems.
The nature of silica deposits found on turbine blades varies greatly. lists a number of silica compounds that have been identified in various studies of turbine blade deposition. Of these, amorphous silica (SiO2) is the most prevalent.
Localized Silica Saturation. Turbine deposits are also formed where localized silica saturation occurs and silica condenses from the steam in those areas of the turbine. Partial evaporation of the precipitated silica can then occur with only a portion of the silica being dissolved by the continuous steam flow. Deposits remain as a result.
Turbine Velocity. Another factor affecting the location of turbine deposits is the velocity in the turbine. Steam flows from the inlet to the outlet of the turbine in only a fraction of a second. Consequently, deposition is shifted downstream from the saturation point by the high steam velocities.
Prevention of Silica Deposits
The most significant factor in minimizing turbine silica deposits is the maintenance of low silica concentrations in the boiler water. External treatment equipment must be operated carefully to limit the amount of silica entering with the makeup water, and the condensate must be monitored to minimize contamination. After silica enters the boiler water, the usual corrective action is to increase boiler blowdown (to decrease the boiler water silica to acceptable levels) and then to correct the condition that caused the silica contamination.
