Discussion
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- Question
The essential constituent of a hardened steel is
Options- A. pearlite
- B. austenite
- C. martensite
- D. troostite
- Correct Answer
- martensite
- 1. The nuts and bolts are made from silicon steel.
Options- A. Correct
- B. Incorrect Discuss
- 2. A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to
Options- A. 100 N/mm2
- B. 200 N/mm2
- C. 350 N/mm2
- D. 1000 N/mm2 Discuss
- 3. Which of the following solids are malleable and ductile?
Options- A. Ionic solids
- B. Covalent solids
- C. Metallic solids
- D. none of these Discuss
- 4. The delta-iron possesses a body centred cubic space lattice.
Options- A. Correct
- B. Incorrect Discuss
- 5. Silicon in cast iron
Options- A. makes the iron soft and easily machinable
- B. increases hardness and brittleness
- C. makes the iron white and hard
- D. aids fusibility and fluidity Discuss
- 6. The steel widely used for making precision measuring instruments is
Options- A. nickel steel
- B. nickel-chrome steel
- C. high speed steel
- D. chrome-vanadium steel Discuss
- 7. Babbit metal contains
Options- A. 50% tin and 50% antimony
- B. 66% tin, 30% copper and 4% antimony
- C. 88% tin, 4% copper and 8% antimony
- D. 92% tin, 6% copper and 2% antimony Discuss
- 8. When a steel containing more than 0.8% carbon is cooled slowly below the lower critical point, it consists of
Options- A. mainly pearlite
- B. mainly ferrite
- C. ferrite and pearlite
- D. pearlite and cementite Discuss
- 9. In a crystalline material, atoms are arranged in definite and orderly manner and form.
Options- A. Agree
- B. Disagree Discuss
- 10. In high speed steels, vanadium adds to the property of red hardness and tungsten and chromium add to high wear resistance.
Options- A. True
- B. False Discuss
Engineering Materials problems
Search Results
Correct Answer: Incorrect
Correct Answer: 350 N/mm2
Correct Answer: Metallic solids
Correct Answer: Correct
Correct Answer: makes the iron soft and easily machinable
Correct Answer: nickel steel
Correct Answer: 88% tin, 4% copper and 8% antimony
Correct Answer: pearlite and cementite
Correct Answer: Agree
Correct Answer: True
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