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Engineering Materials
Comments
Question
Ferrite and pearlite makes the steel soft and ductile.
Options
A. Agree
B. Disagree
Correct Answer
Agree
Engineering Materials problems
Search Results
1. The type of space lattice found in gamma-iron is
Options
A. face centred cubic space lattice
B. body centred cubic space lattice
C. close packed hexagonal space lattice
D. none of these
Show Answer
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Correct Answer: face centred cubic space lattice
2. The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is
Options
A. chromium
B. nickel
C. vanadium
D. cobalt
Show Answer
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Correct Answer: cobalt
3. The ability of a material to absorb energy in the plastic range is called
Options
A. resilience
B. creep
C. fatigue strength
D. toughness
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Correct Answer: resilience
4. Iron ore is, usually, found in the form of
Options
A. oxides
B. carbonates
C. sulphides
D. all of these
Show Answer
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Correct Answer: all of these
5. The lower critical point for all steels is
Options
A. 600°C
B. 700°C
C. 723°C
D. 913°C
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Correct Answer: 723°C
6. The heat treatment process used for softening hardened steel is
Options
A. carburising
B. normalising
C. annealing
D. tempering
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Correct Answer: tempering
7. The lower critical temperature
Options
A. decreases as the carbon content in steel increases
B. increases as the carbon content in steel increases
C. is same for all steels
D. depends upon the rate of heating
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Correct Answer: is same for all steels
8. Which of the following material has maximum ductility?
Options
A. Mild steel
B. Copper
C. Nickel
D. Aluminium
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Correct Answer: Mild steel
9. The percentage of carbon in cast iron varies from
Options
A. 0.1 to 0.5
B. 0.5 to 1
C. 1 to 1.7
D. 1.7 to 4.5
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Correct Answer: 1.7 to 4.5
10. In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled
Options
A. in still air
B. slowly in the furnace
C. suddenly in a suitable cooling medium
D. any one of these
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Correct Answer: slowly in the furnace
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