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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
Sabine formula for reverberation of time?
T= 0.165V/As
v= volume of the hall
a= absorption coefficient
s= surface area
Can you put water in a hydraulic jack?
you can but you'll be buying a new one very shortly afterwards. Use hydraulic fluid. Brake fluid works well also
Can you convert 435.6 feet into meters?
13,277.088 m
Algebraic Steps / Dimensional Analysis Formula 43,560 ft*12 in
1 ft*2.54 cm
1 in*1 m
100 cm=13,277.088 m
Direct Conversion Formula 43,560 ft*0.3048 m
1 ft=13,277.088 m
A proper weld is produced as the rod is moved across the material, and the flame at the end of the rod cuts a path in the material and that path is refilled by the material of the rod. It flows back into the cut out filling it and joining the materials.
If the welder is too hot, or the persons technique is incorrect, or they are moving the rod to fast, the the path cut by the flame on the end of the rod is not properly filled, and the result is an undercut running along the side of the weld. This undercut causes the weld to be weak and makes it susceptible to failing.
Undercutting is easy to correct and requires practice by the welder to get the flame temperature and the speed right so as to fill the path that is cut until full. The opposite being going to slow and making a humped up weld. A proper weld will be slightly over the surface of the original part, smooth with no pits or holes, and no undercutting.
Air conditioner tonnage calculation?
Calculating the appropriate tonnage (cooling capacity) for an air conditioner is essential to ensure that the unit effectively cools the desired space. The tonnage required depends on factors such as the room's size, insulation, climate, and heat-generating sources. The British Thermal Units (BTUs) are commonly used to measure cooling capacity. Here's a general guideline for calculating the required tonnage:
1.Determine the Room's Square Footage: Measure the length and width of the room in feet, then multiply these dimensions to get the square footage. For example, a room that is 20 feet long and 15 feet wide has a square footage of 20 x 15 = 300 square feet.
2. Consider the Insulation: If the room is well-insulated, you can use the following BTU formula:
BTUs = Square footage x 25
3. Adjust for Insulation and Climate: If the room has poor insulation or is in a particularly hot climate region, you may need to adjust the BTU calculation. Here's a more detailed formula:
BTUs = (Square footage x 25) + (Extra BTUs for insulation and climate)
The "Extra BTUs for insulation and climate" factor depends on the insulation quality and climate conditions:
- Well-insulated room: No extra BTUs needed (0)
- Average insulation: Add 10% to the calculated BTUs
- Poor insulation: Add 20% to the calculated BTUs
- Hot climate (sunny and above 90°F): Add 10% to the calculated BTUs
- Very hot climate (sunny and above 100°F): Add 20% to the calculated BTUs
4. Account for Heat-Generating Sources: If the room has significant heat sources (such as large windows, many occupants, or heat-generating appliances), you may need to add extra BTUs to compensate for this heat load. The exact adjustment depends on the specific heat sources present in the room.
5. Convert BTUs to Tons: Air conditioner capacity is typically measured in tons. To convert BTUs to tons, divide the calculated BTUs by 12,000 (1 ton = 12,000 BTUs). For example, if the calculated BTUs are 24,000, the required tonnage is 24,000 / 12,000 = 2 tons.
It's essential to use these calculations as a starting point and consult with a professional HVAC technician to ensure that the air conditioner is correctly sized for your specific needs. Factors such as the number of occupants, local climate, and unique room characteristics can influence the tonnage requirement. Oversized or undersized air conditioners can lead to inefficiency, discomfort, and higher energy bills.
Why does a hot shower fog up a bathroom mirror?
When you take a shower the water droplets have a greater surface area then simply having the water sit in the tub as it does in a bath. The leads to increased evaporation. With more moisture in the air it is easier for condensation to occur on a cool surface such as a mirror.
When are hydraulic machines used?
they are used when a heavy weight has to be lifted, for example, when a car is lifted in a garage so that the mechanic can see the bottom of the car. they can also be used in mountain bikes and car brakes use hydraulics.
What is the different between steel joist and steel girder?
A girder is the primary horizontal member carying loads from other beams and slabs connected to it. That is a girder has other beams connecting to it on its sides .Typically beams do not have other beams connecting to it but generally have only slabs transferring the loads to it.
The case is similar to beam and joist combination where the closely spaced joists (floor joist and ceiling joist) transfer the loads to the beam but usually from the top rather than from the sides.
a flywheel and clutch which is on the same shaft and a motor (which rotates the flywheel),also a ram(the moving assembly of press) is connected to the clutch..when motor rotates the flywheel and we apply electrical supply to the clutch..the clutch engaged with the flywheel.we get a motion into the ram.................................................................................................................................................................hun etho simple ni koi das sakda.............................
Who is the father of mechanical engineering?
James Watt was a mechanical engineer of 16th century who developed the concept of steam engines. Some consider him as the Founder of mechanical engineering.
Some considered Leonardo Da Vinci as the father of Mechanical Engineering.
Both the schools of thoughts, work only if we consider industrial revolution and product engineering as the base of engineering.
According to me, it is the first human who created the fire or invented a wheel or lever or a pulley or tried that kind of mechanisms to ease his job. He could be anybody.
What is fit in mechanical engineering?
Fit refers to how tight the clearance is between a shaft and hole. Fits range from loose, free, medium, transitional to interference fit. In metric the system ranges from E6 being very loose to R7 tight interference fit.
What are ways of laying out the marking out shapes or patterns to maximise use of materials?
You can cut patterns to size and arrange them on the material to be cut. CAD programs perform this operation and are used on LASER, PLASMA, WATER CUTTING and punch machines. Most companies here in the U.S. use CAD.
Why are water tube boilers considered less dangerous than fire-tube boilers?
Advantages of fire tube boilers: - More residual heat in the water to allow for load swings - Simpler control systems due to larger volumes of water in shell - Water quality doesn't change as quickly due to larger volume of water
Disadvantages of fire tube boilers - Maximum Allowable Working Pressure is limited due to larger surfaces exposed to pressure, to about 250 psi - Danger of a pressure part explosion due to failure of the shell and resulting rapid expansion of the large volume of water in the shell - Longer warm-up times due to the large amount of water in the shell. - Larger footprint than a water tube boiler of the same rating. - Less efficient per sq. ft. of heating surface since less of the water is in contact with heating surface due to a larger volume of water in the shell.
Advantages of Water Tube Boilers - Rapid warming due to a much larger heating surface per pound of water in the boiler. - Easier to have a superheater if necessary - Virtually unlimited Maximum Allowable Working Pressure (within reason) - Smaller footprint than a fire-tube boiler of the same rating - Less working volume of water contained in the pressure parts - More water volume exposed to the heating surface than a fire tube boiler (more efficient) - Faster load change response due to less water - Less chance of a pressure part explosion due to less volume of water exposed to a rupture situation, plus, the rupture is usually into the furnace area which is safer.
Disadvantages of a Water Tube Boiler - Must be more careful of feed-water quality - More complex control systems for drum level necessary due to smaller water spaces, (although I have worked in plants with old marine three drum boilers with huge steam drums which only had thermo-hydraulic regulators for drum level) - Operators must be quicker on the draw when there is an upset because everything happens faster with a water tube boiler
Rahul Menon
Twitter- @menenrahul
Shackles are steel connectors made from a body and a pin.
A shackle, also known as a gyve, is a U-shaped piece of metal secured with a clevis pin or bolt across the opening, or a hinged metal loop secured with a quick-release locking pin mechanism. The term also applies to handcuffs and other similarly conceived restraint devices that function in a similar manner.
Shackles are the primary connecting link in all manner of rigging systems, from boats and ships to industrial crane rigging, as they allow different rigging subsets to be connected or disconnected quickly. A shackle is also the similarly shaped piece of metal used with a locking mechanism in padlocks.
Types:
Bow Shackle
With a larger "O" shape to the loop, this shackle can take loads from many directions without developing as much side load. However, the larger shape to the loop does reduce its overall strength. Also referred to as an anchor shackle.
D-Shackles
Also known as a chain shackle, D-shackles are narrow shackles shaped like a loop of chain, usually with a pin or threaded pin closure. D-shackles are very common and most other shackle types are a variation of the D-shackle. The small loop can take high loads primarily in line. Side and racking loads may twist or bend a D-shackle.
Pin Shackles
A pin shackle is closed with an anchor bolt and cotter pin, in a manner similar to a clevis. It is for this reason they are often referred to, in industrial jargon, as clevises. Pin shackles can be inconvenient to work with, at times, as the bolt will need to be secured to the shackle body to avoid its loss, usually with a split pin or seizing wire. A more secure version used in crane rigging features the combination of a securingnut (hardware) located alongside the cotter pin. Pin shackles are practical in many rigging applications where the anchor bolt is expected to experience some rotation.
Snap Shackles
As the name implies, a snap shackle is a fast action fastener which can be implemented single handedly. It uses a spring activated locking mechanism to close a hinged shackle, and can be unfastened under load. This is a potential safety hazard, but can also be extremely useful at times. The snap shackle is not as secure as any other form of shackle, but can come in handy for temporary uses or in situations which must be moved or replaced often, such as a sailor's harness tether or to attach spinnaker sheets. Note: When this type of shackle is used to release a significant load, it will work rather poorly (hard to release) and is likely to have the pin assembly or the split ring fail.
Twist Shackles
A twist shackle is usually somewhat longer than the average, and features a 90° twist so the top of the loop is perpendicular to the pin. One of the uses for this shackle include attaching the jib halyard block to themast, or the jib halyard to the sail, to reduce twist on the luff and allow the sail to set better.
There is no standard. Each college and university has a start date particular to itself. However, the approximate start date for most institutions within the United States is around mid January. The college I teach at starts January 22, 2009.
There is no standard. Each college and university has a start date particular to itself. However, the approximate start date for most institutions within the United States is around mid January. The college I teach at starts January 22, 2009.
There is no standard. Each college and university has a start date particular to itself. However, the approximate start date for most institutions within the United States is around mid January. The college I teach at starts January 22, 2009.
There is no standard. Each college and university has a start date particular to itself. However, the approximate start date for most institutions within the United States is around mid January. The college I teach at starts January 22, 2009.
There is no standard. Each college and university has a start date particular to itself. However, the approximate start date for most institutions within the United States is around mid January. The college I teach at starts January 22, 2009.
There is no standard. Each college and university has a start date particular to itself. However, the approximate start date for most institutions within the United States is around mid January. The college I teach at starts January 22, 2009.
What advantage does galvanised pipe have over black mild steel?
Great material for oil lines /natural gas /steam / hydronics / condensate /chilled water piping /air
What is the tensile strength of glass fiber?
The compressive strength of bricks varies depending on the type of bricks and what they are used for. The compressive strength of conventional red bricks is 40 to 65 Kg/cm2. In comparison, flyash bricks have a compressive strength of 70 to 120 Kg/cm2.
Name of liquid used in capillary thermostats?
You want a liquid that is not compressible so polar compounds are preferres. For safety, the nontoxic and highly stable silicones are used. They have low vapor pressures and high boiling points so they remain liquid and are quite noncompressible.
This type of thermostat is filled with Alcohol, which responds well to changes in airconditioned space.
Which is better fire tube boiler or water tube boiler?
The words are literal , a water tube boiler is water inside the tubes with hot gases surrounding them and a fire tube boiler are got gases within the tubes with water surrounding them.
How does D2 toolsteel compare to S7 tool steel?
D2 tool steel is a steel, tool steel.
For cold rolled steel, D2.
How do you calculate capacity of water tube boiler if heating surface is knows?
Please be more specific...
What is the history of pneumatic systems?
Joseph Bramah patented the hydraulic press in 1795.[1] While working at Bramah's shop, Henry Maudslay suggested a cup leather packing.[2] Because it produced superior results, the hydraulic press eventually displaced the steam hammer from metal forging.[3]
To supply small scale power that was impractical for individual steam engines, central station hydraulic systems were developed. Hydraulic power was used to operate cranes and other machinery in British ports and elsewhere in Europe. The largest hydraulic system was in London. Hydraulic power was used extensively in Bessemer steel production. Hydraulic power was also used for elevators, to operate canal locks and rotating sections of bridges.[1][3] Some of these systems remained in use well into the twentieth century.
Harry Franklin Vickers was called the "Father of Industrial Hydraulics" by ASME.
Force is equal to pressure times area. By increasing the area of the output force, the force goes way up. This is because water cannot be compressed, and therefore the pressure cannot change. In this way, a hydraulic device works almost like a lever. It increases the area of the output force and therefore decreases the amount of input force needed.
