Mechanical Engineering - Engineering Materials

36. 

A steel with 0.8% carbon and 100% pearlite is called

A. eutectoid steel
B. hypo-eutectoid steel
C. hyper-eutectoid steel
D. none of these

Answer: Option A

Explanation:

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37. 

18/8 stainless steel consists of

A. 18% nickel and 8% chromium
B. 18% chromium and 8% nickel
C. 18% nickel and 18% chromium
D. 8% nickel and 8% chromium

Answer: Option B

Explanation:

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38. 

Vanadium when added to steel

A. increases tensile strength
B. decreases tensile strength
C. raises critical temperature
D. Sowers critical temperature

Answer: Option A

Explanation:

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39. 

The limestone in the charge of a blast furnace decomposes to give lime and carbon dioxide. The lime thus obtained

A. controls the grade of pig iron
B. acts as an iron-bearing mineral
C. supplies heat to reduce ore and melt the iron
D. forms a slag by combining with impurities

Answer: Option D

Explanation:

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40. 

During the operation of a bessemer converter, the white flame indicates that the silicon and managenese had burnt and carbon has started oxidising.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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