Which is stronger between a rivet and a bolt?
A riveted connection requires much more force to break the connection than a bolted connection. Furthermore, a bolt can become loosened by vibration which is highly unlikely in a riveted connection. Therefore, a bolt is weaker than a rivet.
What should eccentricity be on a steam turbine before startup?
eccentricity measurementof shaft at slow roll speed.
WITH BEST RGARD
AZIZ JAMALI
SR SUPERVISOR INSTRUMENT FFBL KARACHI PAK
AZIZ.JAMALI@YAHOO.COM +923462243209
Why viscosity important in fluid property?
Viscosity provides a resistance to a fluid being squirted out, say, between a crankshaft and a bearing journal under pressure. So measuring viscosity will be important for predicting how much protection a given fluid will provide.
What are the advantages of a food chain?
A food web is more accurate than a food chain. Animals eat different things, and are eaten by different things, a web will show all or most of its predators and prey, whereas a food chain will only show one predator and one prey.
What are the post-secondary education needed for mechanical engineer?
To become a mechanical engineer, a bachelor's degree in mechanical engineering or a closely related field is typically required. Many programs also include hands-on experience through internships or co-op opportunities. Some positions may require a master's degree for advanced roles, and obtaining a Professional Engineer (PE) license can enhance career prospects and credibility in the field. Continuing education is also essential for staying updated with technological advancements and industry standards.
Difference between butterfly valve and gate valve?
Butterfly valve refers to a kind of valve whose closing part (butterfly plate) is a disc, which rotates around the valve shaft to achieve opening and closing. It mainly plays a role of cutting off and throttling on the pipeline. The butterfly valve opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment. The butterfly valve is usually 90° from fully open to fully closed. The butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be opened and closed quickly by rotating 90°, and the operation is simple.
The opening and closing part of the gate valve is a gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The advantages of the gate valve: small fluid resistance, less effort to open and close, no restriction on the flow of the medium, no turbulence, no pressure reduction
You would have to find the volume of the box in cm3 and then change units in to mL's.
If the box is not full of the liquid , measure the volume of the box at where the liquid levels off.
What is a typical open circuit voltage for an arc welding machine?
I read that it can go up to 80 Volts, any more and it becomes a shock hazard to the operator.
How do you calculate interpass temperature in welding?
Interpass temperature is the maximum temperature a weldment should be allowed to reach between weld passes. If a pass is completed and the temperature is in excess of the interpass, it should be allowed to cool before continuing.
How do you calculate welding filler metal in mig welding?
A number of factors go into this: base material thickness, joining material thickness, wire thickness, shielding gas composition, angle of weld, etc. The best way to determine this is to measure your material, then open your MIG welder, find the wire size of the spool, and read the chart inside of the MIG Welder door.
What is the tensile strength of cotton in lbs per square inch?
If fiberglass is layed up in one direction only (unidirectional) its strength is greater than 100,000 psi for E glass and 250,000 psi for S glass.
If layed up in cross plies like fiberglass cloth (G10) strength in tension is about 40,000 psi
What the F size Allen key to remove a 2007 caravan front caliper?
I believe the 2007 Caravan caliper is held on with 7mm Allen screws.
What is difference between vacuum pump and centrifugal pump?
A compressor is a piece of equipment that compresses gas either to transfer to a specific location or for a certain process requirement. Compressor are manufactured depending on application and can be class into two basic types; positive-displacement and centrifugal.
Integrally geared centrifugal compressors can operate at many times higher speeds than reciprocating compressors. The higher speeds ultimately result in smaller package sizes, requiring a smaller footprint as compared to a reciprocating compressor. The operating speed of a reciprocating compressor is very slow due to mechanical and dynamic limitations. Furthermore, the lower speed of reciprocating compressor lends itself to larger compressor size, heavier weight, and larger plot plan size. Whereas the centrifugal compressor with higher operating speeds results in smaller overall compressor package sizes such as smaller gearing, bearings, seals, lubrication system, and foundation. Smaller packages ultimately lend themselves to saving in lower overall installations as well as lower capital and spare parts costs.
Higher reliability is fully attainable with centrifugal compressors. The rotating aerodynamic components (impellers) have no physical contact with the stationary parts (inlet shroud). On the contrary, the reciprocating compressor moving components such as the piston and valves are physically in contact with the cylinder and other stationary components during operation. The physical contact causes wear and tear of both moving and stationary components, which requires constant maintenance. However, a centrifugal compressor operates for many years with continuous service without overhaul maintenance, resulting in less power plant down time. This eliminates loss of product, provides more profit, lowers risk, and results in lower maintenance cost. Overhaul periods are more predictable by analyzing characteristic efficiency and vibration trends. A typical centrifugal compressor overhaul inspection period is more than 7 years as compared to less than 2 years for most reciprocating compressors.
In addition to the economical advantages of implementing a centrifugal compressor over a reciprocating compressor, many technical advantages are also evident. The centrifugal compressor discharge pressure can be regulated to less than 0.5% per second. The well-regulated compressor discharge pressure provides very steady supply of fuel to the gas turbine. This is an advantage since it does not cause additional burden to the turbine controls. On the other hand, a reciprocating compressor at best can provide 2% or more of pulsating pressure. Unsteady supply of fuel may cause hardship on the turbine control system. A reciprocating compressor would require an impractically over-sized pulsation bottle to minimize supply pressure pulsation to the level as steady as a centrifugal compressor.
Considering there is no physical contact between the centrifugal compressor aerodynamic components, the need for lubrication within the compression components is not required; thus it will not add oil or other contaminants to the process gas. However, a reciprocating compressor requires oil lubricant for the piston rings. This oil eventually ends up in the process gas or it has to be separated to protect the gas turbine. Due to physical contact between the piston rings and the cylinder, the wear of the rings and packing causes particle contamination of the fuel gas. Hence, this contamination could cause premature wear on the turbine blades and other turbine fuel gas passages
Compare Hydraulic cylinders single acting and double acting?
Single Acting Cylinders:
In single acting cylinders the fluid is pressurized from only one side of the cylinder during both the expansion as well as the retraction process.
Double Acting Cylinders:
In the double acting cylinders, the pressure from the fluid is applied in both the directions.
Any double-acting cylinder may be used as a single-acting unit by draining the inactive end.
By hamza_siddiqui@hotmail.com
Which stream is better mechatronics or mechanical?
Mechatronics is the combination of mechanics, electricity, computers and electronics.
Mechatronics is a new mechanic.
Excessive application of mechatronics in the world today.
Vastdad should be interested in the mechanics. Electronics. Computer. Electricity.
You can also learn industrial automation.PLC
What is steam in thermodynamics?
Saturated steam is gas-phase water in equilibrium with liquid water at the same temperature and pressure. If the temperature is above the saturation point and/or the pressure is below the saturation pressure, the steam is "superheated steam". In either case it is a gas.
There are some conventions where saturated steam along with some fraction of liquid water in equilibrium with it is still referred to as steam even if not all of it is gas, as long as at least some of it is gas.
What is the fracture toughness of nylon?
a middle weight (like a 92) has a tensile strength of about 15 lbs.
What is the weight of a cubic inch of mild steel?
about .2833 pounds per cubic inch (cubic inch H x W x L, for round rod its R^2 x pie x L)
How does a heat exchanger work in a gas furnace?
shell is the place where hot utilities comes across meets with the tubes which is cold utilities, in order to transfer heat. the area of the heat being transfer depends on how many/much the area of tubes being exposed to the shell hot utilities. the greater the area of tubes being exposed, more heat being transfer. hence, less energy needed in order to heat a big amount of cold utilities. decreasing of the temperature from hot utilities which pass over the tubes, next will be recycled back with others hot utilities/sources of heat.
Metric unit of young's modulus?
Young's modulus is defined as the ration of stress to strain for a given material below the limit of proportionality (the elastic limit). So Young's modulus is calculated by the formula: Stress/Strain is equal to young's modulus. Stress is defined as the force per unit area of cross-section below the limit of proportionality. So the formula is: Force (in newtons)/ Cross sectional area (in square metres). This would give the units Newtons per square metre which is written Nm-2 which is exactly the same as the Pascal (Pa); either can be used. Strain is defined as the fractional change in length produced when a body is subjected to stress. It's formula is: Change in length produced (in metres)/ Original legth (in metres). There are no units as it is a ratio of two values that have the same unit. So Young's Modulus has the formula: (Force/area)/(change in length/original length). This can be simplified to Stress/Strain (the amount of stress a body has to undergo to produce a certain amount of strain. The unit for stress is the Pascal (Pa) and there are no units for strain so overall, the unit for Young's Modulus is the Pascal (Pa) or Nm-2.
What thickness of steel will stop the penetration of a 7.62mm short round?
There is no standard thickness. Different steels have different properties as do bullets
You can paint about anything. Depending on the temperature the iron is getting will say what type of paint you need. (there is special paint for engines) if the iron is going to get extremely hot, you might not find a sutable paint.
What is the deformation between strain and deformation?
First of all i guess the right question is difference between strain and deformation. Actually the strain is deformation in a material over its original length. So strain is a relative quantity while deformation is simply change in length, hence absolute and is new length minus original length.
Strain= deformation(L2-L1)/original length(L1)