Mechanical Engineering - Engineering Materials

6. 

In flame hardening, oxy-acetylene flame is used.

A. Yes
B. No

Answer: Option A

Explanation:

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7. 

Which of the following statements are true for annealing of steels?

A. Steels are heated to 500 to 700° C
B. Cooling is done slowly and steadily
C. Internal stresses are relieved
D. all of these

Answer: Option D

Explanation:

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8. 

The ability of a material to undergo large permanent deformation with the application of a tensile force, is called ductility.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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9. 

Which of the following steel making process is being adopted at Rourkela Steel Plant?

A. Bessemer process
B. Open-hearth process
C. Electric process
D. L-D process

Answer: Option D

Explanation:

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10. 

18-4-1 high speed steel contains

A. vanadium 4%, chromium 18% and tungsten 1%
B. vanadium 1%, chromium 4% and tungsten 18%
C. vanadium 18%, chromium 1% and tungsten 4%
D. none of the above

Answer: Option B

Explanation:

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