Industrial Heat Treatment Questions with Answers - Set 02 - ObjectiveBooks

Industrial Heat Treatment Questions with Answers - Set 02

Practice Test: Question Set - 02


1. A punch is made out of alloyed steel. After hardening it, a crack takes place. What can be the reason to develop this crack?
    (A) The punch is heated for too long
    (B) The punch is heated too little
    (C) The punch is quenched too slowly
    (D) The punch is quenched suddenly

2. Case Hardening is a method of producing hard skin on the surface of
    (A) High-carbon steel parts
    (B) Cast iron (heavy parts)
    (C) Low-carbon steel parts
    (D) Alloy steel parts

3. The purpose of heat treatment is
    (A) To change the mechanical properties of steel
    (B) To change the internal structure of steel
    (C) To change the appearance of the component
    (D) To change the chemical properties of steel

4. In nitriding process ammonia gas is produced at
    (A) 500°C to 560°C
    (B) 575°C to 600°C
    (C) 600°C to 650°C
    (D) 650°C to 700°C

5. The external surface of the part made of mild steel can be hardened by
    (A) Tempering
    (B) Normalizing
    (C) Case hardening
    (D) Hardening

6. A approximate hardness of HSS milling cutter is
    (A) 45 HRC
    (B) 52 HRC
    (C) 62 HRC
    (D) 75 HRC

7. One component of C50 steel is heated to 830°C soaked 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.
    (A) Annealing
    (B) Normalizing
    (C) Hardening and tempering
    (D) Case hardening

8. What is the main purpose of annealing?
    (A) To improve machinability
    (B) To improve magnetism
    (C) To increase hardness
    (D) To increase toughness

9. 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?
    (A) Oil, forced air, brine solution
    (B) Forced air, oil, brine solution
    (C) Brine solution, oil, forced air
    (D) Forced air, brine solution, oil

10. Which one of the following structures of steel is obtained due to the drastic cooling from the austenite structure?
    (A) Pearlite
    (B) Cementite
    (C) Martensite
    (D) Troostite

11. Which one of the following is the solid carburizing material?
    (A) Charcoal
    (B) Petrol
    (C) Ammonia
    (D) Kerosene

12. For case hardening the first stage is carburizing. By carburizing it is meant?
    (A) Increasing the percentage of carbon of the steel piece
    (B) Increasing the percentage of carbon of the core of the piece
    (C) Increasing the percentage of carbon on the surface
    (D) Decreasing the percentage of carbon of the steel piece

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