Practice Test: Question Set - 03
1. Which one of the following processes 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
2. 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
3. What is the hardening temperature for H.S.S. tool?
- (A) 1250°C
- (B) 950°C
- (C) 850°C
- (D) 750°C
4. Which one of the following is the purpose of tempering a hardened steel component?
- (A) To increase
toughness
- (B) To increase
ductility
- (C) To increase
hardness
- (D) To reduce
hardness
5. While normalizing the steel should be cooled
- (A) In still air
to room temperature
- (B) In oil
- (C) By forced
air
- (D) In water
6. During heat treatment when carbon is dissolved to form solid solution, it is known as
- (A) Ferrite
- (B) Pearlite
- (C) Austenite
- (D) Cementite
7. 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
8. The process of heating steel to about 40°C above the upper critical temperature and cooling it in still air to room temperature is known as
- (A) Hardening
- (B) Annealing
- (C) Normalizing
- (D) Tempering
9. 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
10. In heat treatment process annealing is done to
- (A) Increase
the toughness
- (B) Increase
the softness
- (C) Increase
the hardness
- (D) Increase
the brittleness
11. Which one of the following processes is adopted to improve the internal structure of steel, which has been subjected to severe hammering?
- (A) Hardening
- (B) Annealing
- (C) Normalizing
- (D) Tempering
12. The process of increasing carbon percentage on the surface of Low-carbon steel is known as
- (A) Hardening
- (B) Nitriding
- (C) Carburizing
- (D) Tempering
13. For annealing hypoeutectoid steel according to the carbon content, it should be heated to
- (A) 30°C to 50°C
above the lower critical point
- (B) 30°C to 50°C
above the upper critical point
- (C) 600°C to
630°C
- (D) 1000°C to
1030°C
14. 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
15. To reduce internal stresses of a hardened tool, the method of heat treatment generally applied is
- (A) Stabilizing
- (B) Annealing
- (C) Normalizing
- (D) Tempering
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