Engineering Materials - Section 1 (2)

Directions to Solve

Engineering Materials - Section 1

9.

The hardness of steel increases if it contains

A.	pearlite
B.	ferrite
C.	cementite
D.	martensite

Answer: Option C

Explanation:

No answer description available for this question.

10.

Iron ore is, usually, found in the form of

A.	oxides
B.	carbonates
C.	sulphides
D.	all of these

Answer: Option D

Explanation:

No answer description available for this question.

11.

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:

No answer description available for this question.

12.

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:

No answer description available for this question.

13.

The heat treatment process used for softening hardened steel is

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

Answer: Option D

Explanation:

No answer description available for this question.

14.

Nimonic contains __________ percentage of nickel as that of Inconel.

A.	same
B.	less
C.	more

Answer: Option A

Explanation:

No answer description available for this question.

15.

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:

No answer description available for this question.

16.

Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

A.	eutectic cast irons
B.	hypo-eutectic cast irons
C.	hypo-eutectic cast irons
D.	none of these

Answer: Option B

Explanation:

No answer description available for this question.

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