141. Structural steel contains following principal alloying elements
A.Nickel, chromium and manganese
B.Tungsten, molybdenum and phosphorous
C.Lead, tin, aluminium
D.Zinc, sulphur, and chromium
142. Aluminium bronze contains aluminium and copper in the ratio of
A.50 : 50
B.40 : 60
C.60 : 40
D.10 : 90
143. Bronze contains
A.70% copper and 30% zinc
B.90% copper and 10% tin
C.85-92% copper and rest tin with little lead and nickel
D.70-75% copper and rest tin
144. Muntz metal contains copper and zinc in the ratio of
A.50 : 50
B.40 : 60
C.60 : 40
D.20 : 80
145. Gun metal contains
A.70% copper and 30% zinc
B.90% copper and 10% tin
C.85-92% copper and rest tin with little lead and nickel
D.70-78% copper and rest tin
146. Perminvar alloy having constant permeability is an alloy of
A.Nickel, copper and iron
B.Nickel, copper and zinc
C.Copper, nickel and antimony
D.Iron, zinc and bismuth
147. The alloy used for making electrical resistances and heating elements is
A.Nichrome
B.Invar
C.Magnin
D.Elinvar
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