The most commonly used resin for making reinforced plastic is___________________?
(A) Unsaturated polyester
(B) Polypropylene
(C) Polyurethane
(D) Nylon-6
Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is ______________________?
(A) Used for making axle & shafts of aeroplanes, automobiles and locomotives
(B) Having poor fatigue resistance
(C) Having poor toughness
(D) Not helpful in producing cleaner steel due to oxidising action of vanadium
Which of the following stainless steels is non-magnetic ?
(A) Ferritic
(B) Martenistic
(C) Austenitic
(D) None of these
Ceramic materials__________________?
(A) Are exemplified by clay and mica
(B) Are poor electrical conductors due to lack of free electrons
(C) Never exhibit polymorphism
(D) All
Duralumin is an alloy of_________________?
(A) Aluminium, copper and manganese
(B) Aluminium, nickel and silicon
(C) Aluminium and nickel
(D) None of these
Hardening of steel is not possible unless it is heated ______________ critical point?
(A) Above the highest
(B) Above the lowest
(C) Between the first & second
(D) Between the second & third
DDT is shipped in_________________?
(A) Stainless steel containers
(B) Paper bags
(C) Fibre drums
(D) Either
______________ is not a case hardening process?
(A) Carburising
(B) Nitriding
(C) Cyaniding
(D) Annealing
The impure iron (pig iron) that is tapped out from blast furnace contains about _____________ percent carbon?
(A) 0.2
(B) 2
(C) 4
(D) 8
Presence of high phosphorous in cast iron increases its____________________?
(A) Fluidity
(B) Melting point
(C) Shrinkage
(D) Tensile strength