1. The purpose of normalizing steel is to
remove induced stresses.
2. A carbon steel piece is heated just above 730°C, maintained at that temperature for a few hours and then slowly cooled. What heat treatment process is carried out ?
Annealing.
3. A given component cracked after heat treatment. What can be the possible reason ?
It was suddenly cooled in brine.
4. Case hardening is a method of producing hard skin on the surface of
Low-carbon steel parts.
5. To reduce internal stresses of a hardened tool, the method of heat treatment generally applied
is
Tempering.
6. The toughness in a steel is increased and brittleness is decreased by a heat treatment
operation called as
Tempering.
7. In a case hardening process, ammonia gas is introduced on steel; the process is known as
Nitriding.
8. "Cyaniding " and "Nitriding" are two methods of
Case hardening.
9. After heating upto required hardening temperature, why must tool steels be quenched ?
To build up hardening structure .
10. A punch is made out of unalloyed steel. After hardening a crack takes place. What can be
the reason to develop this crack ?
The punch is too little heated.
11. Heat treatment of metals is necessary
To produce certain desired properties.
12. The external surface of the part made of mild steel can be hardened by
Case hardening.
13. In nitriding process the NH3 gas is introduced at
500°C to 560°C .
14. H.S.S. is tempered at
550°C to 600°C.
15. The instrument used to measure high temperature in the furnace is
Pyrometer.
16. Which one of the following processes is used for hardening the surface of tool steel ?
Induction hardening.
17. Lower critical temperature of high carbon steel while hardening is
723°C .
18. Approximate hardness of HSS milling cutter is
62 HRC.
19. The purpose of heat treatment is
To change the mechanical properties of steel.
20. One component of C50 steel is heated to 830°C, soaked at it for some time and then
quenched in oil. Again it is heated to 600°C and quenched in oil. Name this process of heat treatment.
Hardening and tempering.
21. Which one of the following groups of quenching media is in order of their severity of
the cooling rate, i.e. from slow to rapid cooling ?
Forced air, oil, brine solution.
22. Which one of the following processes is adopted to improve the internal structure of steel,
which has been subjected to severe hammering ?
Normalising.
23. Which one of the following structures of steel is obtained due to the drastic cooling from
the austenite structure ?
Martensite.
24. Which one of the following processes by which steel is heated to the required temperature
and then cooled slowly in the furnace itself ?
Annealing.
25. What is the main purpose of annealing ?
To improve machinability.
26. During heat treatment when carbon is dissolved to form solid solution, it is known as
Austenite.
27. Which one of the following is the solid carburizing material ?
Charcoal.
remove induced stresses.
2. A carbon steel piece is heated just above 730°C, maintained at that temperature for a few hours and then slowly cooled. What heat treatment process is carried out ?
Annealing.
3. A given component cracked after heat treatment. What can be the possible reason ?
It was suddenly cooled in brine.
4. Case hardening is a method of producing hard skin on the surface of
Low-carbon steel parts.
5. To reduce internal stresses of a hardened tool, the method of heat treatment generally applied
is
Tempering.
6. The toughness in a steel is increased and brittleness is decreased by a heat treatment
operation called as
Tempering.
7. In a case hardening process, ammonia gas is introduced on steel; the process is known as
Nitriding.
8. "Cyaniding " and "Nitriding" are two methods of
Case hardening.
9. After heating upto required hardening temperature, why must tool steels be quenched ?
To build up hardening structure .
10. A punch is made out of unalloyed steel. After hardening a crack takes place. What can be
the reason to develop this crack ?
The punch is too little heated.
11. Heat treatment of metals is necessary
To produce certain desired properties.
12. The external surface of the part made of mild steel can be hardened by
Case hardening.
13. In nitriding process the NH3 gas is introduced at
500°C to 560°C .
14. H.S.S. is tempered at
550°C to 600°C.
15. The instrument used to measure high temperature in the furnace is
Pyrometer.
16. Which one of the following processes is used for hardening the surface of tool steel ?
Induction hardening.
17. Lower critical temperature of high carbon steel while hardening is
723°C .
18. Approximate hardness of HSS milling cutter is
62 HRC.
19. The purpose of heat treatment is
To change the mechanical properties of steel.
20. One component of C50 steel is heated to 830°C, soaked at it for some time and then
quenched in oil. Again it is heated to 600°C and quenched in oil. Name this process of heat treatment.
Hardening and tempering.
21. Which one of the following groups of quenching media is in order of their severity of
the cooling rate, i.e. from slow to rapid cooling ?
Forced air, oil, brine solution.
22. Which one of the following processes is adopted to improve the internal structure of steel,
which has been subjected to severe hammering ?
Normalising.
23. Which one of the following structures of steel is obtained due to the drastic cooling from
the austenite structure ?
Martensite.
24. Which one of the following processes by which steel is heated to the required temperature
and then cooled slowly in the furnace itself ?
Annealing.
25. What is the main purpose of annealing ?
To improve machinability.
26. During heat treatment when carbon is dissolved to form solid solution, it is known as
Austenite.
27. Which one of the following is the solid carburizing material ?
Charcoal.
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