HEAT TREATMENT MCQ 2
1) During heat treatment when carbon is dissolved to form solid solution, it is known as
Ferrite
Pearlite
Austenite
Cementite
Correct Answer- (C)
2) Which one of the following is the solid carburizing material?
Charcoal
Petrol
Ammonia
Kerosene
Correct Answer- (A)
3) While hardening, after heating the steel to the required temperature, it is held at that temperature as soaking time for normally
5 minutes for 10 mm thickness
10 minutes for 5 mm thickness
2 minutes for 20 mm thickness
20 minutes for 2 mm thickness
Correct Answer- (A)
4) Which one of the following quenching media is used for hardening H.S.S. tool?
Water
Brine solution
Oil
Soda water
Correct Answer- (C)
5) What is the hardening temperature for H.S.S. tool?
1250°C
950°C
850°C
750°C
Correct Answer- (A)
6) Which one of the following is the purpose of tempering a hardened steel component ?
To increase toughness
To increase ductility
To increase hardness
To reduce hardness
Correct Answer- (A)
7) While normalizing the steel should be cooled
in still air to room temperature
in oil
by forced air
in water
Back
Next
Correct Answer- (A)
8) The process of increasing carbon percentage on the surface of tow-carbon steel is known as
Hardening
Nitriding
Carburizing
Tempering
Correct Answer- (C)
9) The process of producing a component with tough and ductile core and a hard outer surface is known as
Hardening
Case hardening
Tempering
Annealing
Correct Answer- (B)
10) 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
Hardening
Annealing
Normalizing
Tempering
Correct Answer- (C)
11) Which one of the following heat treatment processes produces a scale-free surface on the component?
Flame hardening
Case hardening
Nitriding
Induction hardening
Correct Answer- (D)
12) In heat treatment process annealing is done to
increase the toughness
increase the softness
increase the hardness
increase the brittleness
Correct Answer- (B)
13) After hardening process, the metal becomes more hardened and also will become more
Brittle
Ductile
Malleable
Tough
Correct Answer- (A)
14) For case hardening the first stage is carburising. By carburising it s meant…
Increasing the percentage of carbon of the steel piece
Increasing the percentage of carbon of the core of the piece
Increasing the percentage of carbon on the surface
Decreasing the percentage of carbon of the steel piece
Correct Answer- (C)
15) For annealing hypoeutectoid steel according to the carbon content, it should be heated to
30°C to 50°C above the lower critical point
30°C to 50°C above the upper critical point
600°C to 630°C
1000°C to 1030°C
Correct Answer- (B)
16) Liquid carburising is done in a heated salt bath. Which one of the following is not a carburising salt?
Sodium carbonate
Sodium sulphate
Sodium cyanide
Barium chloride
Correct Answer- (A)
17) For best result of annealing, the heated steel piece is cooled
slowly in the furnace itself by switching off the heat supply
by removing the piece from the furnace and allowing it to cool in open air
be removing the piece from the furnace and placing it under a blast of air
by removing the piece from the furnace and dipping it in a tank containing water
