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Chemical Engineering - Materials and Construction

Exercise : Materials and Construction - Section 5
21.
Pick out the wrong statement.
Metal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure.
Metal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile than those having face centred cubic (fcc) crystal lattice structure.
Tungsten has a body centred cubic (bcc) crystal lattice structure.
Both ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Ability of a material to absorb energy in deformation in the plastic range is characterised as its
ductility
toughness
creep
resilience
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
Monel alloy is
the costliest of all the alloys of nickel.
not suitable for making kitchen utensils.
used for making steam valves and turbine blades as it resists steam attack at high temperature.
not used in cast and wrought forms.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Molybdenum steels containing 0.15 to 0.40% molybdenum
are prone to temper brittleness.
are used for automobile parts like gears, axle, shaft, bearings etc.
have very poor fatigue resistance.
do not contain nickel or chromium or both.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Kel-F is a material, which is
chemically known as polychlorotrifluor-oethylene (PTFE).
having excellent chemical & high temperature resistance (upto 200°C).
having elastomeric properties.
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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