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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
What is the formula for moment of a force?
Turning moment (Nm) = Force (N) x Perpendicular Distance from the pivot to the line of action of the force (m)
What is the applications of the engineering drawing in various fields?
sorry i am not qualified to answer this question buttt some one else could help if you werent such a dumb person
How can you calculated the weight of MS pipe diameter of 500MM and plate thickness 4MM and length6M?
how to calculate the weight of 30x30 squre tube 2mm thick
What is the difference between dynamic strain aging and strain aging?
Strain aging could be described as " normal wear and tear " or the fatigue that is experienced under normal conditions, whereas Dynamic strain would be an out of the normal range stress condition like a one time over stress condition where the sum of much strain aging is experienced in one " dynamic" occurrence.
How does the autor describe the global conveyor belt?
Prevailing winds, especially the Trade winds that powered the tall ships of yesteryear.
The rotation of the Earth and the warmth radiated from our Sun are the factors that create these wind patterns.
What does wcb on a valve mean?
It specifies the grade of steel used in the valve casting. There are actually 3 grades WCA, WCB, and WCC. Based on my experience WCB is the most common.
What are four primary functions of hydraulic oil?
1.Transmit power
2.Lubricate moving parts
3.Seal clearances between mating parts
4.Dissipate heat
3rd sem btech mechanical syllabus of ptu?
I don't think the question makes much sense, if you don't specify what country you are talking about. I don't think there is international agreement as to what such a syllabus should include. Within most countries, there are probably also difference from one university to another.
Suction head limit in centrifugal water pump?
Typically, 0.3 psi below atmospheric pressure. No pump can pull more pressure than what is available in the atmosphere, because the number of molecules available for movement is so low.
Whats the difference between a motor and an engine?
There are different definitions for both depending on the application to which it is put.
For instance, to a mechanical engineer an engine produces energy or power whereby a machine consumes it.
What is the difference between psl1 and psl2 in pipes?
Summary of Differences Between PSL 1 and PSL 2
Parameter
PSL1
PSL2
Grade range
A25 through X70
B through X80
Size range
0.405 through 80
4.5 through 80
Type of pipe ends
Plain-end, threaded end
Plain-end
Seam welding
All methods: continuous welding limited to Grade A25
All methods except continuous and laser welding
Electric welds: welder frequency
No minimum
100kHz minimum
Heat treatment of electric welds
Required for grades > X42
Required for all grades (B through X80)
Chemistry: max C for seamless pipe
0.28% for grades >= B
0.24%
Chemistry: max C for welded pipe
0.26% for grades >= B
0.22%
Chemistry: max P
0.030% for grades >= A
0.025%
Chemistry: max S
0.030%
0.015%
Carbon equivalent
Only when purchaser specifies SR18
Maximum required for each grade
Yield Strength, maximum
None
Maximum required for each grade
UTS, maximum
None
Maximum required for each grade
Fracture toughness
None required
Required for all grades
Nondestructive inspection of seamless
Only when purchaser specifies SR4
SR4 mandatory
Repair by welding of pipe body, plate by skelp
Permitted
Prohibited
Repair by welding of weld seams without filler metal
Permitted by agreement
Prohibited
Certification
Certificates when specified per SR15
Certificates (SR 15.1) mandatory
Traceability
Traceable only until all tests are passed, unless SR15 is specified
Traceable after completion of tests (SR 15.2) mandatory
Are a36 and tool steel the same?
No, A36 is a mild structural steel and tool steel is a high strength alloy steel
How calculate the engine work from pressure crank-angle diagram?
Well Work is the integral of P*dV and since the crank angle plot doesn't directly show volume you need to calculate instaneous volume of the cylinder as a function of crank angle. If you know the bore and stroke you can find the volume of the cylinder and you can relate this to the crank angle. Once you have these values you can replace the crank angle with volume and have a P-V plot or pressure on the y-axis and volume on the x-axis. Then you can integrate the area under the curve and find the work from the engine.
However, all this is done for you if you can find the P-V diagram for your engine or engine cycle (Sterling, Atkinson, Otto, Diesel, etc.) and integrate this for the work.
How do you calculate specific fuel consumption of gas turbine?
A simple-cycle gas turbine used for power generation has a thermal efficiency of about 34 percent. Since 1 kwh is theoretically equivalent to 3,415 Btu, the simple-cycle gas turbine has a fuel connsumption of: 3,415 / 0.34 = about 10,000 Btu/kwh. Given the heating value (i.e, heat of combustion) of a fuel, we can easily calculate the simple-cycle gas turbine fuel usage. For example, natural gas has a net heating value of about 21,500 Btu/pound. Thus, the natural gas consumption in a simple-cycle gas turbine would be: 10,000 / 21,500 = 0.47 pounds/kwh = 0.21 kg/kwh. As another example, a typical diesel oil has a net heating value of 130,000 Btu/gallon. Thus, the diesel oil consumption in a simple-cycle gas turbine would be: 10,000 / 130,000 = 0.077 gallon/kwh. (The gallon used just above is the U.S. gallon rather than the Imperial gallon) A combined-cycle gas turbine will have a higher thermal efficiency and, hence, lower fuel consumptions.
How do you maintain a pneumatic system?
use two syringes attached with tubing, make sure one is totally pulled out and the other is all the way in. apply force to the syringe that is out and the other one should go out. if you can make a hydraulic system, because liquid cannot compress, and air can, meaning the hydraulic system will work faster than a pneumatic system.
What is the difference between booster pump and lifting pump?
The circ pump is used to circulate the water thru the filter. The booster pump is for running the pool sweeper.
What is the principle of tig welding?
Tungsten Inert Gas (orTIG) welding is also referred to as GTAW (Gas Tungsten Arc Welding) and by the term Heliarc® which was the Linde Company's trade name for the TIG process when it was originally introduced.
The welding arc is started with a sharply pointed tungsten electrode shielded by inert gas. A separate filler rod is fed manually into the weld puddle in much the same way as is done when gas welding.
The process is well suited for aluminum.
Why to out bleed steam in turbine?
When steam contains liquid droplets while doing work at high temperatures, the water droplets can etch metal. To combat this, steam can be superheated or the pressure of the system is reduced.
ENDING OPERATIONS AND CLEANING UP Ensure the handle is left in a safe position after use. Leave the work area in a safe, clean and tidy state. POTENTIAL HAZARDS AND INJURIES Sharp edges and burrs. Crush and pinch points. Hair/clothing getting caught in moving machine parts. Operator’s hands may be caught and drawn into the counter-rotating rollers.
When was the steam engine invented and what year?
A learned writer in ancient Alexandria, named Hero, wrote a manuscript describing various devices and ideas of the time. Although it is not proven that Hero was the inventor of any of these devices, he is given credit for the earliest mention of steam power. Hero described a method to open the doors of a temple with the action of a fire on the altar at the front of the temple.... the first "Steam engine."
