Question 20: Which of the following is NOT the advantage of grease? A. Remains at application point and adhere to the surface. B. Less frequent application needed. C. Good for inclined/vertical shaft. D. Good dissipation of heat. (A) (B) (C) Question 21: The common friction modifiers used in grease is A. Tricresyl phosphate (TCP) B. Dibenzyl disulphite. C.Zinc dialbyl dithiophosphate (ZDDP). D. Molybdenum disulphide. (A) (B) (C) Question 22: Synthetic oils are used in aerospace applications because A They can withstand very high range of temperature from -120° F to 5000 F. B. Very high shaft rpm of the order of 60,000 rpm. C. They have shorter carbon chains which are more resistant to heat and stress. D. All of the above. (A) (B) (C)
Ideal and Real Gases
Ideal gases obey conditions of the general gas laws under all states of pressure and temperature. Ideal gases are also named perfect gases. The attributes of ideal gases are as follows,
Gas Laws
Gas laws describe the ways in which volume, temperature, pressure, and other conditions correlate when matter is in a gaseous state. The very first observations about the physical properties of gases was made by Robert Boyle in 1662. Later discoveries were made by Charles, Gay-Lussac, Avogadro, and others. Eventually, these observations were combined to produce the ideal gas law.
Gaseous State
It is well known that matter exists in different forms in our surroundings. There are five known states of matter, such as solids, gases, liquids, plasma and Bose-Einstein condensate. The last two are known newly in the recent days. Thus, the detailed forms of matter studied are solids, gases and liquids. The best example of a substance that is present in different states is water. It is solid ice, gaseous vapor or steam and liquid water depending on the temperature and pressure conditions. This is due to the difference in the intermolecular forces and distances. The occurrence of three different phases is due to the difference in the two major forces, the force which tends to tightly hold molecules i.e., forces of attraction and the disruptive forces obtained from the thermal energy of molecules.
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