91. Which of the following is the hardest material?
92. Which of the following is the softest material?
93. Wood is corroded by
94. Work hardening of a material
95. Wrought iron is
96. Creep is not exhibited at low temperature by
97. Silicon percentage in iron castings to have maximum hardness should be about
98. Heavy duty bearings are usually made of
99. Rotary driers are generally made of
100. Corrosion resisting properties of cast iron are significantly improved by the addition of 12 - 15% of
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