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QuestionWhy Poly tetra fluoro ethylene (PTFE) is usually used in sliding bearings? AnswerThe choice of sliding surface of bearings is of very important importance since sliding surfaces generate frictional forces that are exerted on bearings and substructure of bridge. For example, PTFE and lubricated bronze are usually choices of sliding surfaces for bearings. PTFE is fluro carbon polymer which possesses high-quality chemical resistance and be able to function in wide range of temperature. On whole significant characteristic of this material is its low coefficient of friction. PTFE has slightest possible coefficients of static and dynamic friction of any solid with absence of stick-slip movement by David J. Lee. The coefficient of friction is established to decrease with add to in compressive stress. However, PTFE contain some demerits like high thermal development and low compressive strength. In designing complementary contact plate with PTFE sliding surface, stainless steel plates are in general selected where plates have to be larger than PTFE surface to let movement without exposing PTFE. Moreover, it is recommended that stainless steel surface be located on top of PTFE surface to avoid contamination of dirt and rubbish. Lubricants are now and then introduced to decrease friction between PTFE surface and upper stainless steel plate. Hence, PTFE might be designed with dimples to keep away from lubricant from squeezing out under repeated conversion movements.
Reinforcement of concrete in contact with internal vibrators At the time of concreting, if internal vibrators are placed accidentally in contact with some of the reinforcemen
Question What are main functions of bedding below storm water drains ? Answer Bedding that is normally made of granular resources or concrete serves four main functions as optio
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Define Superposition Method 1. Remove enough redundant supports to reduce the structure to a statically determinate condition 2. Calculate the deflections at the previous l
main types of capacitors explanation
Creep occurs (secondary compression) after consolidation settlements. We defined consolidation settlement, as that compression during which excess pore pressure exists in the strat
Q. What is the importance of General and subsidiary rules. What is the main differences between the two. Ans.- Importance of General and subsidiary rules - General and su
Explain the following: (a) Sea breeze and Land breeze (b) What is Thermal comfort (c) What is Global wind pattern and Coriolis effect (d) How wind affects the tempe
Question What is key distinction in arranging pumps in series and in parallel? Answer For same pumps with similar functions, if pumps arranged in series, total head
Define Installation of Pot Bearings? In a sliding POT bearing, positive fixing to the main structure may not be required if the bearing is always subjected to adequate vertical
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