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
(D) malleable cast iron and silver
Addition of silicon to aluminium results in____________________?
(A) improvement of casting characteristics
(B) improvement of corrosion resistance
(C) one of the best known age and precipitation-hardening systems
(D) improving machinability
(D) none of the above
Which of the following alloys does not have copper as one of the constituents________________?
(A) delta metal
(B) monel metal
(C) constantan
(D) nichrome
(D) silicon bronze
German silver contains_________________?
(A) 1% silver
(B) 2.5% silver
(C) 5% silver
(D) 10% silver
(D) 100% silver
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) 90% aluminium and 90% copper
(D) 90% magnesium and 9% aluminium with some copper
(D) 90% magnesium and 10% tin
Age-hardening is related with______________?
(A) stainless steel
(B) gun metal
(C) german silver
(D) duralumin
(D) cast iron
Babbit metal is a_________________?
(A) lead base alloy
(B) tin base alloy
(C) copper base alloy
(D) all of the above
Acidic solution is one which has pH value__________________?
(A) greater than 7
(B) less than 7
(C) equal to 7
(D) pH value has nothing to do with neutral solution
(D) none of the above
Following elements have face-centred cubic structure__________________?
(A) gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt
(B) Mg, Zn, Ti, Zr, Br, Cd
(C) a iron (below 910°C and between 1400 to 1539°C), W
(D) all of the above
(D) none of the above
The transistor is made of___________________?
(A) silver
(B) gold
(C) copper
(D) germanium
(D) german silver