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Mechanical Engineering - Engineering Materials

Exercise : Engineering Materials - Section 4
31.
In the lower part of the blast furnace (zone of fusion), the temperature is
400° to 700°C
800°C to 1000°C
1200°C to 1300°C
1500°C to 1700°C
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?
Silicon
Sulphur
Manganese
Phosphorus
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
Which of the following statement is wrong?
A steel with 0.8% carbon is wholly pearlite
The amount of cementite increases with the increase in percentage of carbon in iron
A mechanical mixture of 87% cementite and 13% ferrite is called pearlite
The cementite is identified as round particles in the structure
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
Inconel contains
65% nickel, 15% chromium and 20% iron
68% nickel, 29% copper and 3% other constituents
80% nickel and 20% chromium
80% nickel, 14% chromium and 6% iron
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
In a hardening process, 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.
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