Engineering Materials problems
- 1. The silicon steel is widely used for
Options- A. connecting rods
- B. cutting tools
- C. generators and transformers in the form of laminated cores
- D. motor car crankshafts Discuss
Correct Answer: generators and transformers in the form of laminated cores
- 2. The percentage carbon content in wrought iron is about
Options- A. 0.02
- B. 0.1
- C. 02
- D. 0.4 Discuss
Correct Answer: 0.02
- 3. When filing or machining cast iron makes our hands black, then it shows that __________ is present in cast iron.
Options- A. cementite
- B. free graphite Discuss
Correct Answer: free graphite
- 4. Nickel when added to copper improves
Options- A. machinability
- B. hardness
- C. hardness and strength
- D. strength and ductility Discuss
Correct Answer: hardness
- 5. The alloying element which reduces the formation of iron sulphide in steel is
Options- A. chromium
- B. nickel
- C. vanadium
- D. manganese Discuss
Correct Answer: manganese
- 6. Babbit metal is a
Options- A. lead-base alloy
- B. copper-base alloy
- C. tin-base alloy
- D. cadmium-base alloy Discuss
Correct Answer: tin-base alloy
- 7. 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
Correct Answer: atomic packing factor
- 8. 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
Correct Answer: heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
- 9. 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 Discuss
Correct Answer: there is no change in grain size
- 10. The maximum internal diameter of a blast furnace is about
Options- A. 3 m
- B. 6 m
- C. 9 m
- D. 12 m Discuss
Correct Answer: 9 m
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