61. Chromel (Nichrome) is an alloy of
62. The metals occuring at the lower most position in the electromotive series
63. Atmospheric corrosion of metals result from their
64. Condenser tubes are not made of
65. Which of the following is the most prone to atmospheric corrosion?
66. Bronze is an alloy of copper and
67. Material of construction of pipe generally used for conveying water in India is
68. Centrifugal pump made of pyrex or glass can't be used to pump
69. Babbit metal used for making bearings should have
70. Tank furnace used for melting of glass is made of
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