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.Management Sciences
Category: Engineering Materials
Blast furnace produces following by reduction of iron ore_______________?
A. cast iron
B. pig iron
C. wrought iron
D. malleable iron
E. white iron
Nickel in steel___________________?
A. improves wear resistance, cutting ability and toughness
B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties
C. improves cutting ability and reduces hardenability
D. gives ductility, toughness, tensile strength and anticorrosion properties
E. none of the above
If a refractory contains high content of silicon, it means refractory is__________________?
A. acidic
B. basic
C. neutral
D. brittle
E. none of the above
Isotropic materials are those which have the same ____________________?
A. elastic properties in all directions
B. stresses induced in all directions
C. thermal properties in all directions
D. electric and magnetic properties in all directions
E. density throughout
Pure iron is the structure of_______________?
A. ferrite
B. pearlite
C. anstenite
D. ferrite and cementite
E. ferrite and pearlite
Which one of the following metals would work-harden more quickly than the others__________________?
A. copper
B. brass
C. lead
D. silver
E. aluminium
Which of the following is the binding material in cemented carbides___________________?
A. cobalt
B. nickel
C. vanadium
D. iron
E. carbon
Which is false statement about annealing. Annealing is done to________________?
A. relieve stresses
B. harden steel slightly
C. improve machining characteristic
D. soften material
E. permit further cold working
The metallic structure of mild steel is_________________?
A. body centred cubic
B. face centred cubic
C. hexagonal close packed
D. cubic structure
E. orthorhombic crystal
The percentage of carbon in grey iron castings usually varies between __________________?
A. 0.5 to 1%
B. 1 – 2%
C. 2.5 to 4.5%
D. 5 – 7%
E. 7-9%.
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