Discussion
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- Question
Ball bearings are, usually, made from
Options- A. low carbon steel
- B. high carbon steel
- C. medium carbon steel
- D. chrome steel
- Correct Answer
- chrome steel
- 1. Eutectoid reaction occurs at
Options- A. 600°C
- B. 723°C
- C. 1147°C
- D. 1493°C Discuss
- 2. Macro-structure of a material is, generally, examined by
Options- A. naked eye
- B. optical microscope
- C. metallurgical microscope
- D. X-ray techniques Discuss
- 3. There are fourteen atoms in a unit cell of
Options- A. body centred cubic space lattice
- B. face centred cubic space lattice
- C. close packed hexagonal space lattice
- D. none of these Discuss
- 4. In the lower part of the blast furnace (zone of fusion), the temperature is
Options- A. 400° to 700°C
- B. 800°C to 1000°C
- C. 1200°C to 1300°C
- D. 1500°C to 1700°C Discuss
- 5. Sulphur 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 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
- 7. The percentage carbon content in wrought iron is about
Options- A. 0.02
- B. 0.1
- C. 02
- D. 0.4 Discuss
- 8. 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
- 9. Nickel when added to copper improves
Options- A. machinability
- B. hardness
- C. hardness and strength
- D. strength and ductility Discuss
- 10. The alloying element which reduces the formation of iron sulphide in steel is
Options- A. chromium
- B. nickel
- C. vanadium
- D. manganese Discuss
Engineering Materials problems
Search Results
Correct Answer: 723°C
Correct Answer: naked eye
Correct Answer: face centred cubic space lattice
Correct Answer: 1200°C to 1300°C
Correct Answer: increases hardness and brittleness
Correct Answer: generators and transformers in the form of laminated cores
Correct Answer: 0.02
Correct Answer: free graphite
Correct Answer: hardness
Correct Answer: manganese
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