71. __________ is the most suitable lubricant for drawing mild steel wires?
72. Maraging steels derive their strength from the following mechanism:
73. Ignition of fuel in a diesel engine is by
74. Blast furnace slag is mainly molten
75. Paint spray gun works on the principle of
76. For the irreversible reaction, Ca+ 2C = CaC2, ΔH°298 = -60000 J.mole-1. If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be
77. __________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
78. Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are
79. Which of the following welding processes employs the highest welding temperature ?
80. Which of the following is a boiler accessory i.e., not a boiler mounting ?
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