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
(D) 90% copper and 10% zinc
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
(D) none of the above
Which of the following is used for bearing liner_______________?
(A) gun metal
(B) bronze
(C) bell metal
(D) babbit metal
(D) brass
Recrystallisation temperature can belowered by_________________?
(A) purification of metal
(B) grain refinement
(C) working at lower temperature
(D) all of the above
(D) none of the above
Basic solution is one which has pH value___________________?
(A) greater than 7
(B) equal to 7
(C) less than 7
(D) pH value has nothing to do with basic solution
(D) none of the above
Neutral 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
The correct composition of Babbit metal is__________________?
(A) 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi
(B) 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg
(C) 87% Sn, 4% Cu, 8% Sb, 1% Al
(D) 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg
(D) none of the above
Aluminium bronze contains__________________?
(A) 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
(B) 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
(C) 10% aluminium and 90% copper
(D) 90% magnesium and 9% aluminium with some copper
(D) 10% aluminium and 90% tin
Foundry crucible is made of_________________?
(A) mild steel
(B) german silver
(C) lead
(D) cast iron
(D) graphite
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
(D) none of the above