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- Question
When a low carbon steel is heated upto lower critical temperature,
Options- A. there is no change in grain size
- B. the average grain size is a minimum
- C. the grain size increases very rapidly
- D. the grain size first increases and then decreases very rapidly
- Correct Answer
- there is no change in grain size
- 1. In a hardening process, the hypo-eutectoid steel is
Options- A. heated from 30° C to 50° C above the upper critical temperature and then cooled in still air
- B. heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
- C. heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace
- D. heated below or close to the lower critical temperature and then cooled slowly Discuss
- 2. The ratio of the volume occupied by the atoms to the total volume of the unit cell is called
Options- A. coordination number
- B. atomic packing factor
- C. space lattice
- D. none of these Discuss
- 3. Babbit metal is a
Options- A. lead-base alloy
- B. copper-base alloy
- C. tin-base alloy
- D. cadmium-base alloy Discuss
- 4. The alloying element which reduces the formation of iron sulphide in steel is
Options- A. chromium
- B. nickel
- C. vanadium
- D. manganese Discuss
- 5. Nickel when added to copper improves
Options- A. machinability
- B. hardness
- C. hardness and strength
- D. strength and ductility Discuss
- 6. The maximum internal diameter of a blast furnace is about
Options- A. 3 m
- B. 6 m
- C. 9 m
- D. 12 m Discuss
- 7. Monel metal contains
Options- A. 65% nickel, 15% chromium and 20% iron
- B. 68% nickel, 29% copper and 3% other constituents
- C. 80% nickel and 20% chromium
- D. 80% nickel, 14% chromium and 6% iron Discuss
- 8. According to Indian standard specifications, cast iron designated by 'FG 150' means
Options- A. white cast iron with B.H.N. 150
- B. white cast iron with 150 MPa as minimum compressive strength
- C. grey cast iron with B.H.N. 150
- D. grey cast iron with 150 MPa as minimum tensile strength Discuss
- 9. The iron ore mostly used for the production of pig iron is
Options- A. magnetite
- B. haematite
- C. limonite
- D. siderite Discuss
- 10. Hardness of steel is increased by adding sulphur, lead and phosphorus.
Options- A. Yes
- B. No Discuss
Engineering Materials problems
Search Results
Correct Answer: heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Correct Answer: atomic packing factor
Correct Answer: tin-base alloy
Correct Answer: manganese
Correct Answer: hardness
Correct Answer: 9 m
Correct Answer: 68% nickel, 29% copper and 3% other constituents
Correct Answer: grey cast iron with 150 MPa as minimum tensile strength
Correct Answer: haematite
Correct Answer: No
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