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Nitrides, Silicides and Sulfides
Nitrides contain very high melting point but initiate to oxidize at low temperature. They have poor resistance also to chemicals. Boron nitride have a graphite structure and thus exhibit lubricating properties. A type of boron carbide identified as Borazon produced via compressing beneath high pressure of 68000 atmospheres at a temperature above 1700oC has hardness equivalent to such of diamond. Borazon also has a excellent resistance to oxidation and can withstand a temperature of 1950oC.
Draw neat diagram of aWankel engine and explain its working. Derive expressions for work done and efficiency for an Otto cycle. Illustrate with diagrams the several types of
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Boiler efficiency and heat losses, heat Balence sheet, boiler draught, high pressure boiler
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