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
Next Tests: