YIELDABILITY – The ability of the sand mixture to decrease in volume so as not to limit the contraction of a solidifying casting. YELLOW BRASS – An alloy of about 70% copper and 30% zinc. YIELD POINT – The stress at which a marked increase in deformation occurs without an increase in load stress as seen in mild…
WATER COOLED COMPRESSOR – A compressor whose cylinder is water jacketed and through which flows a current of cold water which functions as a transmission medium to carry off some of the heat of compression. WORK – The overcoming of resistance through a certain distance by the expenditure of energy. WADDLE – A sideways vehicle shake due to…
VALVE GEAR – The mechanism or combination of parts by which a reciprocating or to and fro motion is imparted to the valve from the rotary motion of the shaft. VOLUMETRIC EFFICIENCY – The ratio of the actual number of cubic meter of free air (at 1.03 ks.cm abs and 15° C) compressed per unit of time…
UNDER STEER – The tendency of the vehicle not to turn as much as the wheels are turned. UNITIZED CONSTRUCTION – A type of automobile body and frame construction in which the frame and body parts are welded together to form a single unit. UNSPRUNG WEIGHT – That part of the vehicle which is not supported on springs…
THROW OF THE ECCENTRICITY – Twice the eccentricity or the amount of reciprocating motion produced. TWO STAGE COMPRESSOR – A compressor in which compression begins in one cylinder and is completed in the second cylinder. It divides the compression range between the two cylinders and permits cooling between the cylinders. TWO STAGE CYLINDER – A cylinder of special…
SEMI FIXED COMPRESSOR – A unit larger than the portable type where skids are used in place of being mounted on a truck, the adaptation being for service where frequent moving is not necessary. SEPARATOR – Device through which the compressed air after being cooled in the after cooler, is sent so as to separate the moisture…
R (gas constant) – An experimentally determined constant which is equal to the mechanical work done by the expansion of unit weight of a perfect gas at a constant pressure while heat is added to increase its temperature by one degree centigrade. RATIO OF COMPRESSION – Ratio of final volume to the initial volume during compression. RECIPROCATING…
QUALITY GOVERNING – Power developed is governed by varying the quantity of fuel injected while the quantity of air sucked in is almost the same. The air fuel ratio in the combustion chamber is different at different loads. QUICK SILVER – Metallic mercury. QUENCHING – Rapid cooling of a metal in a bath of fluid during heat treatment…
PISTON SPEED – The total distance travelled by the piston in one minute, not the actual velocity at any given instant. PORTABLE COMPRESSOR – A small compressor which is easily moved from place to place. POWER – The rate at which work is done, that is work divided by the time in which it is done. Unit of…
ONE WAY CLUTCH – A clutch that holds in one direction but allows movement in another direction. OVER DRIVE – A device in the power train of some vehicles that introduces an extra set of gears into the power train. This causes the propeller shaft to overdrive or drive faster than the engine crankshaft. Engine speed is…