Related Questions

The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?
A Cyaniding
B Sheardising
C Spherodising
D None of these
Which is false statement about case hardening? Case hardening is done by
A Electroplating
B Cyaniding
C Induction hardening
D Nitriding
Case hardening is not done by
A Nitriding
B Hot dipping
C Electroplating
D Both B & C
The cooling medium used in dry quenching of coke is
A Nitrogen
B Air
C Phenolic water
D Carbon dioxide
__________ is not a case hardening process.
A Carburising
B Nitriding
C Cyaniding
D Annealing
Hardening of steel is not possible, unless it is heated __________ critical point.
A Above the highest
B Above the lowest
C Between the first & second
D Between the second & third
Hardening of steel is not possible unless it is heated __________ critical point.
A Above the highest
B Above the lowest
C Between the first & second
D Between the second & third
In a hardening process, the hypo-eutectoid steel is
A Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
B Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
C Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
D Heated below or closes to the lower critical temperature and then cooled slowly
For hardening alloy steels and high speed steels, they are heated to
A 1100 to 1300°C
B 1300 to 1500°C
C 500 to 600°C
D 700 to 900°C
Early attainment of strength in rapid hardening cement is mainly due to
A Gypsum
B Finer grinding
C Tri-calcium silicate
D Tri-calcium aluminate

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