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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 syllabus of mechanical engineering?
Mathematics-matrix,eigen values & vector, laplace transforms
Themodyanamic-first law second law and entopy
Fluid mechanics-statics and dynamics
Strenght of material -mohar stress strain analysis,thin &thick cylinder spring
Machine design-satatic loasd and flactuating load analysis
Material science and manufacturing-proprties of materials and various Manufacturing process
General knoledge,general awareness,aptitude,reasing
Duration-2h, no of questions- 150
What was the first internal combustion engine used for and how did it work?
Essentially the first internal combustion engine was invented in the late 1600's (the specific year is unknown) by the English inventor Sir Samuel Morland. The engine ran on gun powder and was used mostly for pumping water.
In 1860 the Belgium inventor, Lenoir, designed an engine that some consider the first Internal Combustion Engine, because it ran on a mixture of air and coal dust and was ignited by an electrical spark. In 1863, the engine was revised to include a carburettor and burn liquid petroleum gas. The engine was use to move a three wheeled cart, but most commonly it was used as a stationary power plant for printing presses, water pumps, and machine tools.
What are the maximum upstream and downstream transfer rates for DSL and cable connections?
Cable systems provide rates of approximately 500 Kbps downstream and 128 Kbps upstream. Theoretically they can provide a bandwidth of 30 Mbps. A DSL system can provide speeds of up to 7.1 Mbps, but most providers offer a maximum of 1.5 Mbps upstream and downstream.
What will happen if you use petrol in diesel engine and diesel in petrol engine?
Firstly, DON'T PANIC! More accurately, petrol (gasoline fuel) has been mixed with diesel fuel.
If you realise your mistake before you leave the petrol pump (bowser at gas station) then stay put, BUT DO NOT START THE ENGINE!
If only a few dollars of petrol has gone in you can fill the tank with the proper fuel and it may be O.K.
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Get help to push the vehicle to a place out of the way. Then locate the fuel line and detach it so that ALL the fuel from the tank can drain into suitable containers.
If you cannot do it yourself, then you must call a motor motor mechanic to do it for you.
Do not start the engine as this makes it a whole lot more expensive to fix.
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Stop the engine to prevent damage to the cat (catalytic convertor) if one is fitted to the exhaust system.
To do th job properly a garage would:
- completely drain the fuel tank, probably by removing it from the vehicle first.
- blow through the fuel lines
- drain the injector pump
- remove and replace the fuel filter
- fully fill the tank with the appropriate fuel
- bleed the system
- start the engine
- let the fuel circulate to dilute any petrol residue in the system
- then clear any fault lights if they are showing on the dashboard.
Another opinion
A TV motoring show recently exploded the myth by both running a petrol engine on diesel and a diesel engine on petrol. They ran badly, but they ran. When revertng to proper fuel both engines returned to normal.
Comment on that opinion
Any qualified motor engineer would say it was probably just a lucky co-incidence for the particular engines tested on that TV show and that there may well have been significant damage done that would show up within a few hours of running on the correct fuel.
In general, you should never ever assume that any engine and its subsystems (fuel pump, fuel injectors, etc.) would be as tolerant of being fed with the wrong type of fuel.
What are the reason of vibration in steem turbine?
cavitation usually, or a thrown blade on the impeller.
How does 150 MPA yield compare to PSI?
150 MPa yield is equivalent to approximately 21,755 PSI. This means that a material with a yield strength of 150 MPa can withstand the same amount of stress as a material with a yield strength of 21,755 PSI before plastic deformation.
What is difference of MS pipe and ERW Pipe?
What is the defferec between Carbon steel pipe and Mild steel pipe?
Syed Hamad Ur Rehman
Project Director
Hatah (Pvt) Ltd
hamad@hatch.com.pk
www.hatch.com.pk
Many larger saws and similar machinery have control boxes on the front to operate them . Most of these have a prominent red STOP button.
What education and training is required for Underwater Welding?
weldng s d procecess joning f 2 simillar metals usually.
1st u study about metals nd ther heating r melting temp. nd knowing abt which type metals we use.
nd study about electrodes ie most important nd welly study about diffrnt types f electrodes
nd diffrnt types f welding. they r so many type s dr ie depends upon metals, wtever welding placess nd so must be needed.
study abt flux.
study abt power mean current which type nd hw much pwr s need fr particular welding.
mainthing s saftey nd precasution
Is superheated steam compressible?
Not a hydrologist, but I'd lay money on the fact that steam is mostly air, and ice is mostly water.
The unit of measure of electrical pressure is the?
The unit of measure of electrical pressure is the VOLTS.
What is meant by transient analysis?
it is the response of a system with respect to the input as a function of time
Why is fracture stress less than ultimate tensile strength?
Fracture stress is only less than ultimate tensile strength in an engineering stress-strain diagram. This is because the material will experience a maximum stress before it undergoes necking. After necking, stress will decrease again until the material snaps.
Why we don't use high pressure in pneumatics?
one reason air is much harder to control the heat and air has a lot of water in it and a hydraulic system dose not need water in the hydraulic oil. There is no way at the high pressure that a hydraulic system has to work at,it would not be possible to control the heat.
1 bar equals how many psi and Pa?
1 bar = 100000 Pa
1psi = 6890 Pa
approx 14.5psi to the bar
Precisely,
1 bar =14.5037738 psi
psi = pounds per square inch
The most common welding hazards are, burns, electrical shock, inhalation of harmful fumes, and UV damage to skin and eyes. All can be easily avoided if proper safety precautions are implemented.
An Oldham coupling is a flexible shaft coupling that consists of two hubs (each with a fin or tenon) and one midsection (with grooves that fit those fins, one on each side of the midsection, and perpendicular to one another).
The Oldham coupling is an outstanding design for torque transmission between two shafts which might be slightly misaligned. The coupling accommodates this misalignment, while maintaining homokinetic motion (the two shafts rotate at the same speed at all times), and while exerting only very small reactive forces (resistance to accommodation of the misalignment, exhibited as sideward forces on the shafts).
More information on Oldham couplings can be found at www.oepcouplings.com.
Vulcanization is a chemical process (invented by Charles Goodyear in 1839, patented in 1844), which combined with heat and sulphur, causes polymeric molecules form atomic "bridges" of sulphur or carbon-carbon bonds with other molecules. The once loose, polymer chains are now constrained in mobility due to the chemical cross-linking between polymer chains. This cross-linking is what gives polymers their distinctive properties.
What are the components of low pressure steam boiler?
heating ventilating and air conditioning.Type your answer here...
How can you tell difference in motor oil and hydraulic fluid?
motor oil (new) will (typicly) be a darker shade as well. hydraulic fluid is normally clear or very close to clear.
note: you should not leave either of these fluid's on you're skin. you should wash hands as soon as you are done handling them.
Is there porosity on stainless welding?
Porosity is caused by molten puddle problems: oil, dirt, etc near weld, lack of shielding gas (tank is empty, or wind is blowing away gas. local vaccums for ventilation also can cause gas problems.) If mig welding, if you don't balance wire speed to amps, you may see porosity. Lastly, long arc'ing (too much distance from end of mig wire, to material) can cause bubbling.
What do you use high carbon steel for?
some items are : cutlery, pens, file cabinets etc...
just think about everyday things :)
