Heat Treatment ITI Exam Questions and Answers - Set 01 - ObjectiveBooks

Heat Treatment ITI Exam Questions and Answers - Set 01

Practice Test: Question Set - 01

1. After hardening process, the metal becomes more hardened and also will become more
    (A) Brittle
    (B) Ductile
    (C) Malleable
    (D) Tough

2. Which one of the following processes is used for hardening the surface of tool steel?
    (A) Carburizing
    (B) Cyaniding
    (C) Induction hardening
    (D) Hardening

3. The purpose of normalizing steel is to
    (A) Remove induced stresses
    (B) Improve machinability
    (C) Soften the steel
    (D) Increase the toughness and reduce brittleness

4. In a case hardening process, ammonia gas is produced on steel; the process is known as
    (A) Cyaniding
    (B) Nitriding
    (C) Carburizing
    (D) Ammonizing

5. A given component cracked after heat treatment. What can be the possible reason?
    (A) It was heated for long time
    (B) It was not properly cleaned before heating
    (C) It was suddenly cooled in brine
    (D) It was slowly cooled in air

6. 'Cyaniding' and 'Nitriding' are two methods of
    (A) Hardening
    (B) Case Hardening
    (C) Tempering
    (D) Normalizing

7. After heating up to required hardening temperature, why must tool steels be quenched?
    (A) To induce internal stresses
    (B) To build up hardening structure
    (C) To fall off the scale
    (D) To retain it to its original structure

8. The toughness in steel is increased and brittleness is decreased by a heat treatment operation called as
    (A) Annealing
    (B) Normalizing
    (C) Tempering
    (D) Case hardening

9. For best result of annealing, the heated steel piece is cooled
    (A) Slowly in the furnace itself by switching the heat supply off
    (B) By removing the piece from the furnace and allowing it to cool in open air
    (C) By removing the piece from the furnace and placing it under a blast of air
    (D) By removing the piece from the furnace and dipping it in a tank containing water

10. Heat treatment of metals 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

11. H.S.S. is tempered at
    (A) 220°C to 230°C
    (B) 230°C to 270°C
    (C) 280°C to 400°C
    (D) 550°C to 600°C

12. 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?
    (A) Normalizing
    (B) Casehardening
    (C) Hardening
    (D) Annealing

13. The instrument used to measure high temperature in the furnace is
    (A) Thermometer
    (B) Barometer
    (C) Colorimeter
    (D) Pyrometer

14. Lower critical temperature of high carbon steel while hardening is
    (A) 960°C
    (B) 900°C
    (C) 723°C
    (D) 560°C

15. While hardening, after heating the steel to the required temperature, it is held at that temperature as soaking time for normally
    (A) 5 minutes for 10 mm thickness
    (B) 10 minutes for 5 mm thickness
    (C) 2 minutes for 20 mm thickness
    (D) 20 minutes for 2 mm thickness

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