Mechanical Engineering

It might be less than (10.33/sp. gravity) m

The spindle of a lathe is a rotating hollow tube within, and protruding the head stock and to which a chuck, drive plate or facing plate attaches and rotates to enable machining.

It is housed within the head stock in bearings and has some gears around it which is driven by other gears which in turn is driven by an electrical motor.

This is the "Minimum Requirements for Workplace First Aid Kits". This addresses the minimal first aid needs for small worksites as determined by the American National Standards Institute. Before deciding to abide by this and only this, one would need to take into consideration the physical size and layout of the operation, number of employees, type of work being done and hazards present and augment accordingly.

Principle is based on ductility of material.

Hoist

In axial fans, static load refers to the pressure exerted by the air moving through the fan when it is not in motion, while dynamic load describes the forces acting on the fan during operation, including rotational forces and airflow-induced stress. Static load is primarily concerned with the fan's ability to maintain air pressure, whereas dynamic load takes into account factors like vibration, speed, and airflow changes that occur during operation. Together, these loads influence the fan's design and performance, ensuring it operates efficiently and reliably.

Corrosion is the broad term for something that something is being broken down or eaten away due to chemical reaction. For example dis colorization of a painted object that has been in the sun. You can see some red cars turn pink in time if not take care of. Or i metal when you leave nickel in lemon juice above the water line will turn green and when you wipe it away it feels all rough and that is corrosion

Rust is a specific type of corrosion that consists of iron being reacting with water (or moist air) causing iron oxides

A fluid coupling is a hydrodynamic device used to transmit rotating mechanical power. It has been used in automobile transmissions as an alternative to a mechanical clutch. It also has widespread application in marine and industrial machine drives, where variable speed operation and/or controlled start-up without shock loading of the power transmission system is essential. They are also sometimes called a Fluid Flywheel.

It is create a difference in pressure artificially by exploding or burning a fuel inside a closed chamber and evacuating the pressure suitably

Equivalent material of mild steel ;is:206

turbo blower is an equipment where a turbine is attached with the blower part. steam enters through the turbine inlet and expands through the blades and goes to the outlet which helps the turbine shafts to rotate. this turbine shaft is attached with the shaft of blower that makes the blower rotating.

A repeater connects two segments of your network cable. It retimes and regenerates the signals to proper amplitudes and sends them to the other segments. When talking about, Ethernet topology, you are probably talking about using a hub as a repeater. Repeaters require a small amount of time to regenerate the signal. This can cause a propagation delay which can affect network communication when there are several repeaters in a row. Many network architectures limit the number of repeaters that can be used in a row. Repeaters work only at the physical layer of the OSI network model.

DEFINITION - 1) In digital communication systems, a repeater is a device that receives a digital signal on an electromagnetic or optical transmission medium and regenerates the signal along the next leg of the medium. In electromagnetic media, repeaters overcome the attenuation caused by free-space electromagnetic-field divergence or cable loss. A series of repeaters make possible the extension of a signal over a distance.

Repeaters remove the unwanted noise in an incoming signal. Unlike an analog signal, the original digital signal, even if weak or distorted, can be clearly perceived and restored. With analog transmission, signals are restrengthened with amplifiers which unfortunately also amplify noise as well as information.

Because digital signals depend on the presence or absence of voltage, they tend to dissipate more quickly than analog signals and need more frequent repeating. Whereas analog signal amplifiers are spaced at 18,000 meter intervals, digital signal repeaters are typically placed at 2,000 to 6,000 meter intervals.

2) In a wireless communications system, a repeater consists of a radio receiver, an amplifier, a transmitter, an isolator, and two antennas. The transmitter produces a signal on a frequency that differs from the received signal. This so-called frequency offset is necessary to prevent the strong transmitted signal from disabling the receiver. The isolator provides additional protection in this respect. A repeater, when strategically located on top of a high building or a mountain, can greatly enhance the performance of a wireless network by allowing communications over distances much greater than would be possible without it.

3) In satellite wireless, a repeater (more frequently called a transponder) receives uplink signals and retransmits them, often on different frequencies, to destination locations.

4) In a cellular telephone system, a repeater is one of a group of transceivers in a geographic area that collectively serve a system user.

5) In a fiber optic network, a repeater consists of a photocell, an amplifier, and a light-emitting diode (LED) or infrared-emitting diode (IRED) for each light or IR signal that requires amplification. Fiber optic repeaters operate at power levels much lower than wireless repeaters, and are also much simpler and cheaper. However, their design requires careful attention to ensure that internal circuit noise is minimized.

6) Repeaters are commonly used by commercial and amateur radio operators to extend signals in the radio frequency range from one receiver to another. These consist of drop repeaters, similar to the cells in cellular radio, and hub repeaters, which receive and retransmit signals from and to a number of directions.

7) A bus repeater links one computer bus to a bus in another computer chassis, essentially chaining one computer to another.

1 ton Refrigeration = 3026 kCal / hr

A fillet weld is the joint of 2 pieces of material, usually at a 90 degree angle. see http://www.unified-eng.com/scitech/weld/fillet.html

1. Rajuri Thermex TMT500 rebars have excellent bend properties due to the unique ductility (elongation values) obtained when using the German HSE Thermex Technology.
2. Corrosion Resistance properties

   Controlled water-cooling prevents the formation of coarse carbides, which has been cited as the main cause for the corrosive nature of common bar.

   Another reason for better corrosion resistance is the absence of surface stresses caused by the cold twisting (and Torsteel) process.

3. Weldability

   Rajuri Thermex TMT500 rebars with carbon content less than 0.25% can be used for butt and other weld joints without reduction in strength at the weld joints.

4. Fire Resistance

   Unlike Torsteel and CTD Rebars, Thermex bars have high thermal stability. They are the preferred choice when elevated temperatures of 400-600 C may be encountered (Chimneys, fires).

5. Earthquake Resistance

   Thermex rebars have high fatigue resistance to Dynamic/ Seismic loads due to its higher ductility quality. This makes Thermex bars most suitable for use in earthquake prone areas.

6. Formability

   Due to very high elongation values and consistent properties through out the length of bar, Thermex rebars have excellent workability and bendability.

7. Strain Ageing

   Due to unique and scientific manufacturing process and chemical composition, Thermex rebars show no tendency of embrittlement either during welding or cold deformation of welded joints.

8. Cost Effective

   Thermex TMT rebars required 15-20% less usage than CTD bars for same work with cost 5% more than than CTD bars. This results in overall saving of 10-25%.

make the proper lubrication schedule of all rotating equipment and availability's of all spare parts at proper time.

maching by chemical action

possible noise with brakes

The area available for flow along the length of the Compressors are chosen so that it decreases along the length of the compressor, due to increase in density as air gets compressed across the stages. The cross sectional area distribution across the length of the compressor is chosen for design conditions. At lower rotational speeds of the compressor, the density increase is limited as the pressure rise is very less and flow accelerates in a converging duct resulting in higher velocities in the exit. This problem is severe resulting in high machine vibration and possible component failure for a compressor designed to produce pressure ratio of over 8:1 in a single shaft. Starting the compressor (and hence the engine) becomes a problem then. To overcome this, two shaft arrangement is used so that high pressure compressor rotates at higher speeds, thereby splitting the pressure rise between the spools to alleviate this issue. High pressure compressor and Low pressure compressor are aerodynamically coupled instead of mechanical coupling. Hence HPC drives the LPC by demanding mass flow or spilling it in to bypass.

Posted by Kishore C on 16th May 2013

The STC injector enables the engine to have two timing settings, ie advance mode when in idle and retard mode when and during appliing load.

Condition-Monitoring (CM). This is a maintenance process for items that have neither "hard-time" nor "on-condition" maintenance as their primary maintenance process. CM is accomplished by appropriate means available to an operator for finding and solving problem areas

WCC mean standard temp.

To manage energy.