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
Induction hardening is basically a
A Carburising process
B Surface hardening process
C Core hardening process
D None of these
Induction hardening is the process of
A Hardening surface of work-piece to obtain hard and wear resistant surface
B Heating and cooling rapidly
C Increasing hardness throughout
D Inducing hardness by continuous process
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
A Slop speed operation
B High starting torque
C Low windage losses
D All of the above
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
For hardening high alloy steel, it is to be heated slowly and uniformly to avoid
A Local hardening
B Scale formation
C Segregation
D Warpage
Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.
A Increases
B Decreases
C Does not affect
D Exponentially increases
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
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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