162. Constantant an alloy used in thermocouples is an alloy of
A.Copper and tin
B.Copper and zinc
C.Copper and iron
D.Copper and nickel

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163. White metal contains
A.63 to 67% nickel and 30% copper
B.88% copper and 10% tin and rest zinc
C.Alloy of tin, lead and cadmium
D.Silver and chromium

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164. Y-alloy contains
A.94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B.92.5% aluminium and 40% copper, 2% nickel and 1.5% Mg
C.10% aluminium and 90% copper
D.90% magnesium and 9% aluminium with some copper

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165. German silver contains
A.1% silver
B.2.5% silver
C.5% silver
D.10% silver

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166. Which of the following has highest specific strength of all structural materials
A.Magnesium alloys
B.Titanium alloys
C.Chromium alloys
D.Magnetic steel alloys

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167. Dow metal contains
A.94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B.92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
C.10% aluminium and 90% copper
D.90% magnesium and 9% aluminium with some copper

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168. Foundry crucible is rnade of
A.Mild sfeel
B.Graphite
C.Lead
D.Cast iron

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