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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
A gear tooth vernier is a precision measuring instrument used to measure the dimensions of gear teeth, specifically their thickness, spacing, and profile. It typically features a vernier scale that allows for accurate readings and adjustments, ensuring precise measurements of gear components. This tool is essential in gear manufacturing and quality control, helping to ensure that gears meet specified tolerances and performance standards.
A woman's vaginal fluid changes throughout the month due to hormone fluctuation. During the middle of her cycle, when she's ovulating, it's more fluid. Later in the cycle, when she gets closer to her period, it gets thicker and more sour.
If the length of a simple pendulum is halved then what will be its new time period?
There is a more complex formula that cannot be printed here, but for the sake of simplicity, you can consider the period T to be proportional to the square root of the length of the pendulum L. If L is halved, then T2 is proportional to the square root of 1/2, or approximately 0.707 times T1.
MECHANICAL EXPOSURE IS TO DEVELOPED YOURSELF BY GETTTING AN IDEAL EXPERIENCES AND PRACTICE IN SEVERAL MECHANICAL EQUIPMENT PARTICULARLY IN MAINTENANCE AS WELL AS IN OPERATION.
Show the pictures of cotter joints?
A cotter joint is one that is used to hold parts that might turn, as in an axle or a drive shaft. For example, on a child's wagon, the axles have a hole in each outside end. This hole is for a cotter pin (it looks similar to a bobby pin for the hair), that helps to keep the wheel on while the wheel is turning.
What is the outside casing of boudin made from?
Natural casing which is most common is made from pig intestines which has been flushed throughly. They also have synthetic casing though.
What is meant by two mold casting?
There are two molds that you put together to make the casting, so the part is easier to get out of the mold ----------------- If two or more (sets) of molds were necessary to produce the casting. Picture a statue, one mold was used to create the body and a second mold was used to create an outstretched arm, that is attacted separately.
Which material have negative modulus of elasticity?
never heard of a negative modulus. Some special class polymers have negative Poisson ratio so when you pull on it gets wider inserted of narrower, but I know of none that get shorter when you pull on it
A turbine OEM (Original Equipment Manufacturer) is a company that designs, manufactures, and supplies turbines, which are devices that convert energy from fluids (like gas, water, or steam) into mechanical energy. These manufacturers often provide complete turbine systems, including components and support services, and may specialize in different types of turbines, such as gas, steam, or wind turbines. OEMs play a critical role in the energy sector, ensuring that turbines meet industry standards and customer specifications.
Following are the types of gears generally used inb industry 1)spur gear-having straight teeth(generally preffered due to low cost bu noisy operation 2)bevel gear-having teeth at certain angle(it has the speciality that its teeth when when coincided theotratically it forms the shape of a cone. low noise ) 3)helical gear- having teeth in the form of helix ie at certain angle depending on the application.preffered for low noise applixcation but generally costly 4) rack and pinion-it is an arrangement generally preffered to convert linear motion into rotary motion or vice versa 5)epicyclic gear - generally a group of gear used for power transmission besides these there are some others such as spiral gear
An unplanned event, whether or not it is attended by personal injury or disablement. which result in:.
1.Collapse or failure of a crane, derrick, winch, hoist, or other appliance used in raising or lowering persons or goods, or any part thereof, or the overturning of a crane.
2.Burst of pressurized pipe line etc.
answer by: Santhosh
What size bit to use to tap quarter inch set screw?
It depends which thread the screw is, the pitch and depth of the thread varies.
B.S.F. - 5.3 mm
Whitworth - 5.10 mm
B.S.P. - 11.80 mm
U.N.F. - 5.50 mm
U.N.C. - 5.2 mm
A.N.C., A.N.F. and B.A. threads are numbered, I.S.O threads are in metric
What is the meaning of shaft resonance?
Every thing is vibrating in it's normal standing that named natural vibration. and this vibratin has a frequnce whitch named natural frequencc. if you force a shaft or a rigid matterial with some harmonic force that is affecting in frequence of natural frequency of that matterial there will be resonance. So the shaft or ... deforms as a resault of resonance.
How do you design non-circular gears?
Software is available to design non-circular gears such as "Gearify" and "Gearotic"
How does an internal combustion engine rely on metals to conduct heat .?
Some heat from the combustion chamber goes out in the exhaust, but some gets conducted from the cylinder walls into the water jacket (liquid cooling). In an air cooled engine, heat is conducted into the fins and ultimately convected and radiated to the environment. If that did not happen, the engine would quickly overheat. That could cause it to sieze, or the fuel could preignite, basically throwing the ignition timing way, way off and the engine would stop.
How can you use relay as switch in ac appliances?
A miniature ac relay is used daily in my house within the control circuit for its hot water and domestic central heating system.
For that reason I can confirm that a relay having a coil designed for continuous operation on alternating current will have a coil designed to operate without needing any diodes for rectification of the current supplied to its coil. (As no rectification is needed no capacitor is necessary for smoothing any resulting ripple.)
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The relay contacts should be wired in series with the appliance to be operated and the wiring kept well away from the coil. Don't forget to place a fuse in the contact circuit since the contacts can weld together if a fault develops. <><><> If you have a relay coil rated at say 110 volts it is usually necessary to supply it with a direct current. I would place a silicon diode in series with the coil to rectify the AC and allow the relay to operate. If it buzzes at 50 or 60 Hz you may need to use a bridge rectifier. (4 diodes encapsulated into a ring). If it still vibrates then you need to add a capacitor, rated at the proper voltage, across the coil.
What is seat leakage test in safety valves?
Seat leakage is defined as leakage that is internal to a valve-between the inlet and outlet sides of the valve-when the valve is in its closed position. It is not limited to leakage across the valve seat, but also encompasses all leakage across the valve trim when the valve is in the closed position. Leakage across internal trim seals, such as piston rings, and across trim-to-body seals, such as gaskets, can be counted as seat leakage.
It is important to note that, while leakage through valve stem packing is of growing concern in the industry, governing industry standards address this type of leakage separately and do not consider it to be a form of seat leakage.
What does Tpa stand for tensile strength related studies?
If you are thinking TPa, that is terapascals, or 1 trillion pascals. It is used where truly massive pressures exist. For tensile strength, no material has a strength measured that high. Most materials are measured in MPa, or 1 million pascals.
The study of motions is dealt with in a branch of physics known as mechanical physics. It can be further classified into quantum and classical.
What are the problems with thermal switch?
If you have a problem with the thermal switch, your fans will not come on at temperatures that will switch the fans to on in order to cool down the engine temperature. If you have a problem with the switch (faulty, burnt out), the only way to fix it is to replace it.
Cycle of concentration in cooling tower?
Cooling Tower Cycles of Concentration As pure water is evaporated, minerals are left behind in the recirculating water. As evaporation continues, the water becomes more concentrated than the original make up water. This eventually can lead to saturated conditions. The term cycles of concentration compares the level of solids of the recirculating cooling tower to the level of solids of the original raw make up water. If the circulating water has four times the solids concentration than that of the make up water, then the cycles are 4. Bleed off is the process of removing a portion of concentrated recirculating water, which is obviously replaced with fresh make up water. By specifying a certain amount of bleed off we limit the cycles of concentration the system can operate at, thus controlling scale formation. Various treatments will let us operate at various cycles depending on the make up water analysis and heat loading of the tower. Bleed off is critical to a successful treatment program. The preferred method of bleed off control is with the use of automated bleed off control. This includes a contacting head water meter, dual timer, chemical pump and solenoid controlled bleed off line. A) Evaporation Loss: from a cooling tower (E) = .001 (Cr) (DT) where Cr = circulation rate in gallons per minute and D T = temperature differential between hot and cold water in °F. The evaporation rate amounts to 1% of the recirculation rate for every 10°F DT. B) Windage Loss: This is a relatively small amount of entrained water lost as fine droplets in the air discharge from a tower. Unlike evaporation which does not contain dissolved impurities windage carries these impurities with it and reduces dissolved solids in the circulating water. Typical values are 0.1% to 0.3% of the circulating rate for mechanical draft towers. C) Bleed off: In the evaporation process the non volatile impurities in the make up water are concentrated. To prevent excessive concentration some of the circulating water must be removed from the system. This is commonly referred to as bleed off or blowdown. The amount of bleed off can be determined from the following equations: % B (bleed off) + % (windage) = % E (evaporation loss) / ( cycles -1) D) Cycles: The previous equation added a new turn to the mix . CYCLES!!!!!!!! This is one of the most difficult terms to understand. I will now attempt to define cycles of concentration. The NACE defines it as: A measure of the degree to which dissolved solids are being concentrated in the circulating water. It is in effect the inverse of blowdown. As pure water is evaporated all of the solids are left behind so they concentrate in the cooling tower water. If we start out with fresh water the tower has one cycle of concentration. When all the fresh water is evaporated ( solids are still in the tower) the tower then refills itself with more fresh water and we have twice the solids in the tower. We now have two cycles of concentration. This process will proceed and scale will form at a certain point. We use bleed off to prevent the tower from reaching the point of scale formation. In an actual tower, this is an ongoing process with continuous addition of make up water and continuous bleed off. The allowable cycles of concentration will be determined by the laboratory. They are based on water analysis, heat transfer rate of the equipment, and feed equipment present. We normally use chloride to determine the number of cycles a tower is operating at. The following equation can be used for this calculation: Chlorides in tower water / Chlorides in make up water = Cycles of concentration For example, a tower operating at a 450 gallons per minute recirculating rate (Cr) , 5 cycles of concentration, 10° DT, and 0.1% windage loss: %B + .1% = 1% / (5-1) which is %B = .25% - .1% therefore %B = .15% of the circulating rate. %B = 0.15% ( 450 gallons/minute) which is 0.675 gallons of bleed off /minute. Total make up water requirements for the system are: Bleed off 0.675 gallons per minute
Evaporation 1% (450 gallons/minute) = 4.5 gallons/minute Windage 0.1% (450 gallons/minute) =.45 gallons/minute Total make up water = 5.625 gallons/minute Total make up water per hour is = 60 minutes/hr. ( 5.625 gallons per minute) = 337.5 gallons per hour. As you can see the higher the cycles the less make up water and blowdown are required. This is true to a certain point where additional cycles do not decrease the amount of make up water and blowdown as drastically. The following graph illustrates the point. As you can see at about 4.5 cycles the curve starts leveling off which indicates higher cycles will not effect the quantity of make up water drastically.
