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Mechanical Engineering - Engineering Materials

Exercise : Engineering Materials - Section 3
36.
In process annealing, the hypo-eutectoid steel is
heated from 30° C to 50° C above the upper critical temperature and then cooled in still air
heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace
heated below or close to the lower critical temperature and then cooled slowly
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Delta-iron occurs between the temperature range of
400°C to 600°C
600°C to 900°C
900°C to 1400°C
1400°C to 1530°C
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
According to Indian standard specifications, SG 400/15 means
spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa
spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation
spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
White cast iron has
carbon in the form of carbide
low tensile strength
high compressive strength
all of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
Iron-carbon alloys containing carbon __________ 4.3% are known as hyper-eutectic cast irons.
equal to
less than
more than
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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