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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
Nails axes and knives are considered what type of simple machine?
A nail is a simple machine. :DDD i learned that in tech today.
A mechanical device that can work by means of fuel consumption. A mechanical device that can work by means of fuel consumption.
What is a disadvantage of a lever?
If you wish to multiply force and you are at the right end of the lever the only disadvantage would be the size.
Why is hardness test required to be performed?
because it makes you feel good about yourself, it makes you reach your goals, and it says alot about your character.
Is a leg kicking ball is example of first class lever?
third class lever.
Load/Resistance is the ball
fulcrum = hip & knee
How do I calculate diesel generator emissions?
From AP-42 . Chapter 3.1 , Table 3.3-1 Multiply power by AP-42 factor Example for NOx: 300 HP * (0.031 lb/HP-hr ) = 9.3 lb/hr Apply the same method for SO2, PM10 and CO Factors : SO2 = 0.00205 CO = 0.0068 PM10 = 0.0022 Good Look...!
What is the difference between Cold rolled steel and hot rolled steel?
Hot-rolled sheet has low hardness, easy processing, good ductility and cheaper price. Cold rolled sheet has high hardness, relatively difficult to process, but not easy to deformation, higher strength. If you want to buy cold-rolled steel, you can go to the official website of Changzheng, the price of Changzheng's steel is moderate, and it is the choice of the public. Buy cold-rolled steel plate recognized Changzeng.
What is the advantage of a combined pulley?
It acts as torque-multipier by trading distance for effort.(as you know from your basic physics, WorkDone = Force XDistance.
So if you replace a 1:1 arrangement witha 2:1 pulley, you needto pull twice as much rope but with only half the tension - though you will use the same energy overall!
What are the difference between petrol engine and mpfi engine?
There is no difference. Petrol is just another name for gasoline. MPFI just means Multi-Point Fuel Injection. A petrol (gasoline) engine can be MPFI or it can have a carburetor. It can have many different ways to get gasoline (petrol) to the cylinders.
Screw rotary compressor definition?
A positive displacement compressor consisting of one male and one female rotor which contain lobes that when meshed together reduce the amount of available space for the refrigerant gas to occupy, thus compressing it. The male rotor is usually the drive rotor.
What are the major classifications of basic manufacturing?
classification of basic manufacturing processes.
How much money does a railroad engineer earn?
After about 15-17 years in the trade $100,000 - $140,000. I am a Conductor for the Canadian Pacific Railway and I made $134,000 in 2010. On average I work every other day, sometimes more sometimes less. I've been employed for 22 years at CP. When I work however I am gone for up to 24Hours at a time. Hope this is helpful.
Stress strain curve for brittle material?
Brittle materials such as ceramics do not have a yield point. For these materials the rupture strength and the ultimate strength are the same, therefore the stress-strain curve would consist of only the elastic region, followed by a failure of the material.
What are merchant couplings used for?
To protected pipe thread. Do not use as a pipe coupling. Thread don't taper and the wall is to thin and could crack.
How many types of Centrifugal pump?
For higher pressures at the outlet impellers can be connected in series. For higher flow output impellers can be connected in parallel.
A common application of the multistage centrifugal pump is the boiler feedwater pump. For example, a 350 MW unit would require two feedpumps in parallel. Each feedpump is a multistage centrifugal pump producing 150 l/s at 21 MPa.
All energy transferred to the fluid is derived from the mechanical energy driving the impeller. This can be measured at isentropic compression, resulting in a slight temperature increase (in addition to the pressure increase).
Energy usageThe energy usage in a pumping installation is determined by the flow required, the height lifted and the length and friction characteristics of the pipeline. The power required to drive a pump (), is defined simply using SI units by: Single-stage radial-flow centrifugal pumpwhere: is the input power required (W) is the fluid density (kg/m3) is the standard acceleration of gravity (9.80665 m/s2) is the energy Head added to the flow (m) is the flow rate (m3/s) is the efficiency of the pump plant as a decimal
The head added by the pump () is a sum of the static lift, the head loss due to friction and any losses due to valves or pipe bends all expressed in metres of fluid. Power is more commonly expressed as kilowatts (103 W, kW) or horsepower (kW = hp*0.746). The value for the pump efficiency, , may be stated for the pump itself or as a combined efficiency of the pump and motor system.
The energy usage is determined by multiplying the power requirement by the length of time the pump is operating
Why inert gas use for welding?
Inert gases are use for welding is because in the welding process, the heat will actually hasten up the process of oxidation(rusting) happening on metals.
Oxidation process(rusting) requires oxygen, thus, by using inert gas, it will purge the surrounding of oxygen preventing the oxidation process from happening.
What is the Rockwell hardness test used for?
plan a fair test with timing.........
bash each rock with a hammer and see which one breaks first
How can you measure axial displacement of turbine?
Axial displacement of a turbine can be measured using a non-contact displacement sensor, such as a laser displacement sensor or an eddy current sensor, which provides precise readings without interfering with the turbine's operation. Alternatively, dial gauges or linear variable differential transformers (LVDTs) can be used to measure the axial movement by directly contacting the turbine components. It's important to ensure that the sensors are properly calibrated and positioned to accurately capture the displacement during turbine operation. Regular monitoring helps in assessing the turbine's condition and preventing potential failures.
Is the heat content of a system at a constant pressure?
Yes it is possible, for example when water freezes there is a point when the temperature remains constant however energy is released as the water condenses.
A 15 KW generator won't likely run everything in your house, but besides that it is not efficient. You will be using more electricity to run the generator than the power would deliver. You also defeat the reason for the generator - run your house when power goes out. Now if you had a wind turbine turning a generator you have a positive contribution to house power. This is how wind power works. There are also lots of issues associated with a power transfer switch and feeding power back into the grid.
