Exercise: Engineering Materials

Questions for: Engineering Materials

Which of the following statement is incorrect about duralumin?
A:
It is prone to age hardening
B:
It can be forged
C:
It has good machining properties
D:
It is lighter than pure aluminium
Answer: D
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The ratio of the volume occupied by the atoms to the total volume of the unit cell is called
A:
coordination number
B:
atomic packing factor
C:
space lattice
D:
none of these
Answer: B
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In a hardening process, the hypo-eutectoid steel is
A:
heated from 30° C to 50° C above the upper critical temperature and then cooled in still air
B:
heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
C:
heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace
D:
heated below or close to the lower critical temperature and then cooled slowly
Answer: B
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Inconel contains
A:
65% nickel, 15% chromium and 20% iron
B:
68% nickel, 29% copper and 3% other constituents
C:
80% nickel and 20% chromium
D:
80% nickel, 14% chromium and 6% iron
Answer: D
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Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?
A:
Silicon
B:
Sulphur
C:
Manganese
D:
Phosphorus
Answer: A
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