Mechanical Engineering - Engineering Materials

36. 

The coke in the charge of blast furnace

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 C

Explanation:

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37. 

Nimonic contains __________ percentage of nickel as that of Inconel.

A. same
B. less
C. more

Answer: Option A

Explanation:

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38. 

The heat treatment process used for softening hardened steel is

A. carburising
B. normalising
C. annealing
D. tempering

Answer: Option D

Explanation:

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39. 

The dieing down of a white flame during the operation of a bessemer converter indicates that the air is burning out silicon and manganese.

A. Yes
B. No

Answer: Option B

Explanation:

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40. 

The electric process of steel making is especially adopted to

A. alloy and carbon tool steel
B. magnet steel
C. high speed tool steel
D. all of these

Answer: Option D

Explanation:

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