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- Question
Admirality gun metal contains
Options- A. 60% copper, 35% zinc and 5% manganese
- B. 76% copper, 20% silicon and 4% zinc
- C. 82% copper, 12% zinc and 6% manganese
- D. 88% copper, 10% tin and 2% zinc
- Correct Answer
- 88% copper, 10% tin and 2% zinc
- 1. The process of inducing carbon to __________ carbon steels in order to give it a hard surface is known as carburising.
Options- A. low
- B. medium
- C. high Discuss
- 2. In a close packed hexagonal space lattice, there are
Options- A. nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre
- B. twelve atoms, all of which are located at the twelve corners of a hexagonal prism
- C. fourteen atoms out of which eight atoms are located at the coners of the cube and six atoms at the centres of six faces
- D. none of the above Discuss
- 3. Hardness of steel is increased by adding sulphur, lead and phosphorus.
Options- A. Yes
- B. No Discuss
- 4. The iron ore mostly used for the production of pig iron is
Options- A. magnetite
- B. haematite
- C. limonite
- D. siderite Discuss
- 5. 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
- 6. The addition of manganese to aluminium improves corrosion resistance.
Options- A. Correct
- B. Incorrect Discuss
- 7. Chilled 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
- 8. The maximum solubility of carbon in austenite is 1.7% at 1130° C.
Options- A. Yes
- B. No Discuss
- 9. German silver contains
Options- A. 70% copper and 30% zinc
- B. 60% copper and 40% zinc
- C. 59% copper, 40% zinc and 1% tin
- D. 60.45% copper, 35.2% zinc and 5.35% nickel Discuss
- 10. The approximate height of a blast furnace is
Options- A. 10 m
- B. 20 m
- C. 30 m
- D. 40 m Discuss
Engineering Materials problems
Search Results
Correct Answer: low
Correct Answer: none of the above
Correct Answer: No
Correct Answer: haematite
Correct Answer: grey cast iron with 150 MPa as minimum tensile strength
Correct Answer: Correct
Correct Answer: by quick cooling of molten cast iron
Correct Answer: Yes
Correct Answer: 60.45% copper, 35.2% zinc and 5.35% nickel
Correct Answer: 30 m
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