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LED retrofit equipment that match PAR lamp dimensions is made by some manufacturers. As with the case of LED MR lamps, LED PAR lamps generally use an array of individual LED elements that are unsuitable for reflector operation. Nevertheless, some degree of beam control can be obtained with aperture or lens, and LED PAR 38 replacements with a 40 ...
Parts that are not repairable are considered consumable parts. Consumable parts are usually scrapped, or "condemned", when they are found to have failed. Since no attempt at repair is made, for a fixed mean time between failures (MTBF), replacement rates for consumption of consumables are higher than an equivalent item treated as a repairable ...
The distance between the axis of the crankpins and the axis of the crankshaft determines the stroke length of the engine. [1] Most modern car engines are classified as "over square" or short-stroke, [citation needed] wherein the stroke is less than the diameter of the cylinder bore. A common way to increase the low-RPM torque of an engine is to ...
This article lists different types of pump and provides a comparison of certain key design features. Different types of pumps are suitable for different applications, for example: a pump's maximum lift height also determines the applications it can be used for.
The VR6 is a highly compact engine, thanks to the narrower angle of 10.5 to 15 degrees between cylinder banks, as opposed to the traditional V6 angles ranging from 45 to 90 degrees. The compact design is cheaper to manufacture, since only one cylinder head is required for all six cylinders, much like a traditional inline-6 engine.
The Source Four PAR is similar to the PAR can, but it has differences as well. Unlike the PAR can, the Source Four PAR does not have a movable parabolic reflector. Also, instead of using a PAR lamp, it uses the same lamps as the Source Four Ellipsoidals. Additionally, the Source Four PAR uses changeable lenses that affect the beam. [1]
The main difference between 6060 and 6063 is that 6063 has a slightly higher magnesium content. It can be formed by extrusion, forging or rolling, but as a wrought alloy it is not used in casting. It cannot be work hardened , but is commonly heat treated to produce tempers with a higher strength but lower ductility.
According to ASHRAE standard 34, the R-number of a chemical refrigerant is assigned systematically according to its molecular structure and has between two and four digits. If there are carbon -carbon multiple bonds , there are four digits in all: the number of these bonds is the first digit and the number of carbon atoms minus one (C-1) is next.
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