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Iti fitter multiple choice questions paper with answers pdf heat treatment chapter
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1. The purpose of heat treatment is
A. To change the mechanical property of steel
B. To change the internal structure of steel
C. To change the appearance of the component
D. To change the chemical property of steel
2. Approximately hardness of HSS milling cutter is
A. 45 HRC
B. 52 HRC
C. 62 HRC
D. 75 HRC
3. Lower critical temperature of high carbon steel while hardening is
A. 960°C
B. 900°C
C. 723°C
D. 560°C
Iti fitter multiple choice questions paper with answers pdf for Iti fitter job
Iti fitter multiple choice questions paper with answers pdf for Iti fitter job
4. Which one of the following processes is used for hardening the surface of tool steel
A. Carburizing
B. Cyaniding
C. Induction hardening
D. Hardening
5. The instrument used to measure high temperature in the furnace is
A. Thermometer
B. Barometer
C. Colorimeter
D. Pyrometer
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6. H.S.S. is tempered at
A. 220 to 230°C
B. 230 to 270°C
C. 280 to 400°C
D. 550 to 600°C
7. In nitriding processes the NH3 gas is introduced at
A. 500 to 560°C
B. 575 to 600°C
C. 600 to 650°C
D. 650 to 700°C
8. The external surface of the part made of mild steel can be hardened by
A. Tempering
B. Normalising
C. Case hardening
D. Hardening
9. Heat treatment of metal is necessary
A. To produce certain desired properties
B. To make good appearance on the component
C. To increase strength of the metal
D. To make the metal rust proof
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10. “CYANIDING” and “NITRIDING” are two methods of
A. Hardening
B. Case hardening
C. Tempering
D. Normalizing
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11. In case hardening process, ammonia gas is introduced on steel. the process is known as
A. Cyaniding
B. Nitriding
C. Carburizing
D. Ammonising
12. The toughness in a steel is increased and brittleness is decreased by a heat treatment operation called as
A. Tempering
B. Normalizing
C. Annealing
D. Case hardening
13. To reduce internal stress of a hardened tool, the method of heat treatment generally applied is
A. Stabilising
B. Annealing
C. Normalizing
D. Tempering
14. The purpose of normalizing steel is to
A. Improve machinability
B. Remove induced stresses
C. Soften the steel
D. Increase the toughness and reduce brittleness
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15. Which one of the following is the solid carburizing material
A. Charcoal
B. Petrol
C. Ammonia
D. Kerosene
16. During heat treatment when carbon is dissolved to form solid solution, it is known as
A. Ferrite
B. Pearlite
C. Austenite
D. Cementite
17. What is the main purpose of annealing
A. To improve machinability
B. To improve magnetism
C. To increase hardness
D. To increase toughness
18. Which one of the following by which steel is heated to the required temperature and then cooled slowly in the furnace itself
A. Tempering
B. Hardening
C. Nitriding
D. Annealing
19. Which one of the following structure of steel is obtained due to the drastic cooling from the austenite structure
A. Pearlite
B. Cementite
C. Matensite
D. Troostite
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20. Liquid carburizing is done in a heated salt bath. Which one of the following is not a carburizing salt
A. Sodium carbonate
B. Sodium sulphate
C. Sodium cyanide
D. Barium chloride
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21. After hardening process, the metal becomes more hardened and also will become more
A. Brittle
B. Ductile
C. Malleable
D. Tough
22. In heat treatment process annealing is done to
A. Increase the toughness
B. Increase the softness
C. Increase the hardness
D. Increase the brittleness
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23. Which one of the following heat treatment processes produces a scale free surface on the component
A. Flame hardening
B. Case hardening
C. Nitriding
D. Induction hardening
24. The process of producing a component with tough and ductile core and a hard outer surface is known as
A. Hardening
B. Case hardening
C. Tempering
D. Annealing
25. The process of increasing carbon percentage on the surface of low carbon steel is known as
A. Hardening
B. Nitriding
C. Carburizing
D. Tempering
26. What is the hardening temperature for H.S.S. tool
A. 1250°C
B. 950°C
C. 850°C
D. 750°C
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27. Which one of the following quenching media is used for hardening H.S.S. tool
A. Water
B. Brine solution
C. Oil
D. Soda water
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