Engineering Materials MCQ Questions & Answers | Mechanical Engineering Page-11 section-3

51.
The lower critical point for all steels is

A. 600°C

B. 700°C

C. 723°C

D. 913°C

A. Adding carbon up to 2.8%

B. Adding carbon up to 6.3%

C. Adding carbon up to 0.83%

D. Adding small quantities of copper

A. Nickel, copper

B. Nickel, molybdenum

C. Zinc, tin, lead

D. Nickel, lead and tin

A. 0.8%

B. Below 0.8%

C. Above 0.8%

D. None of these

A. Heated below the lower critical temperature and then cooled slowly

B. Heated up to the lower critical temperature and then cooled in still air

C. Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

D. None of the above

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