Engineering Materials problems
- 1. The heat treatment process used for softening hardened steel is
Options- A. carburising
- B. normalising
- C. annealing
- D. tempering Discuss
Correct Answer: tempering
- 2. The lower critical temperature
Options- A. decreases as the carbon content in steel increases
- B. increases as the carbon content in steel increases
- C. is same for all steels
- D. depends upon the rate of heating Discuss
Correct Answer: is same for all steels
- 3. Which of the following material has maximum ductility?
Options- A. Mild steel
- B. Copper
- C. Nickel
- D. Aluminium Discuss
Correct Answer: Mild steel
- 4. The percentage of carbon in cast iron varies from
Options- A. 0.1 to 0.5
- B. 0.5 to 1
- C. 1 to 1.7
- D. 1.7 to 4.5 Discuss
Correct Answer: 1.7 to 4.5
- 5. In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled
Options- A. in still air
- B. slowly in the furnace
- C. suddenly in a suitable cooling medium
- D. any one of these Discuss
Correct Answer: slowly in the furnace
- 6. A small percentage of boron is added to steel in order to
Options- A. increase hardenability
- B. reduce machinability
- C. increase wear resistance
- D. increase endurance strength Discuss
Correct Answer: increase hardenability
- 7. Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
Options- A. eutectic cast irons
- B. hypo-eutectic cast irons
- C. hyper-eutectic cast irons
- D. none of these Discuss
Correct Answer: hypo-eutectic cast irons
- 8. Specify the sequence correctly
Options- A. Grain growth, recrystallisation, stress relief
- B. Stress relief, grain growth, recrystallisation
- C. Stress relief, recrystallisation, grain growth
- D. Grain growth, stress relief, recrystallisation Discuss
Correct Answer: Stress relief, recrystallisation, grain growth
- 9. Malleable cast iron is produced
Options- A. by adding magnesium to molten cast iron
- B. by quick cooling of molten cast iron
- C. from white cast iron by annealing process
- D. none of these Discuss
Correct Answer: from white cast iron by annealing process
- 10. Shock resisting steels should have
Options- A. low wear resistance
- B. low hardness
- C. low tensile strength
- D. toughness Discuss
Correct Answer: toughness
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