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Knocking sound is the noise you hear caused by detonation,which is an explosion or uncontrolled burning inside the cylinder of a reciprocating engine.

Mechanical efficiency, is the parameter that gives the effectiveness of an engine in transforming it’s input energy to output energy.
For an internal combustion engine, it is the ratio between the brake work and indicated work.
Mechanical efficiency is defined as the ratio of brake power (delivered power) to the indicated power (power provided to the piston).

An allowance is a planned deviation between an exact dimension and a nominal or theoretical dimension, or between an intermediate-stage dimension and an intended final dimension.

The irregularities in the surface texture due to the inherent action of the production process is called Roughness

A more common modern use is in “journal bearing” which refers to the sliding surface between a rotating shaft and a hole it passes through and supports it relative to some other component

Random-access memory is the most common type of memory used for a Rapid-Access Memory which is a form of computer data storage that stores data and machine code currently being used.

Acetylene gas is mixed in liquid acetone for safe storage and usage. Acetone in acetylene cylinders helps stabilize the gas making it non-reactive within the cylinder. In this process, acetylene is dissolved in liquid acetone under high pressure. The cylinder is then filled with porous material like firebrick.

Cores are forms which are placed into the mold to create the interior contours of the casting.
They are typically made of a sand mixture- sand combined with water and organic adhesives called binders.
Which is baked to form the core.

A slick is used for repair and finishing the mould surface after the removal of pattern.
It is a double ended tool having a spoon on one end and a flat on the other end.

A Morse Taper is a tapered spindle used on lathes and drill presses to mount tooling. Morse Tapers on the headstock of your lathe have a hollow housing that is designed to fit a male ended arbor

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