71. The hardest material just prior to diamond in Mhos scale is
72. Dip stick used for measuring the level of petro fuels (e.g. petrol, diesel, fuel oil etc.) in the storage tank is usually made of
73. The process of coating steel sheets by zinc to improve its corrosion resistance is called
74. The main constituent of carborundum is __________ carbide.
75. Cast iron vessels are not suitable for the storage of
76. Wrought iron is having very high
77. Anodic material used for the cathodic protection of underground buried steel pipeline is
78. For platinum thermocouples, lead wires are made of
79. Presence of high phosphorous in cast iron increases its
80. Which of the following is not shipped in mild steel containers?
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