71. The lubricant used for steam cylinders is-
72. Which one of the following is the reason that tap water is not preferred as coolant on machine tools?
73. The function of lubrication in IC engine is
74. The type of water which is good for use in the coolant is
75. The primary objects of lubrication are-
76. Grease is . . . . . . . . type of lubricant.
77. A good anti-freeze material have the requirements
78. Which temperature for a lubricating oil will be lowest?
79. The most important quality of any lubricant is
80. Approximately . . . . . . . . . . per cent of fuel energy has to be taken by cooling system.
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