Engineering Materials problems
- 1. Which of the following iron exist between 910° C and 1403° C?
Options- A. ?-iron
- B. ?-iron
- C. ?-iron
- D. ?-iron Discuss
Correct Answer: ?-iron
- 2. In low carbon steels, __________ raises the yield point and improves the resistance to atmospheric corrosion.
Options- A. sulphur
- B. phosphorus
- C. manganese
- D. silicon Discuss
Correct Answer: phosphorus
- 3. The ability of a material to resist fracture due to high impact loads, is called
Options- A. strength
- B. stiffness
- C. toughness
- D. brittleness Discuss
Correct Answer: toughness
- 4. Iron-carbon alloys containing carbon __________ 4.3% are known as hyper-eutectic cast irons.
Options- A. equal to
- B. less than
- C. more than Discuss
Correct Answer: more than
- 5. An alloy of copper, tin and zinc is known as
Options- A. brass
- B. bronze
- C. gun metal
- D. muntz metal Discuss
Correct Answer: gun metal
- 6. The charge of the blast furnace consists of
Options- A. calcined ore (8 parts ), coke (4 parts) and limestone (1 part)
- B. calcined ore (4 parts), coke (1 part) and limestone (8 parts)
- C. calcined ore (1 part), coke (8 part) and limestone (4 parts)
- D. calcined ore, coke and limestone all in equal parts Discuss
Correct Answer: calcined ore (8 parts ), coke (4 parts) and limestone (1 part)
- 7. A steel with carbon __________ is known as hypo-eutectoid steel.
Options- A. 0.8%
- B. below 0.8%
- C. above 0.8% Discuss
Correct Answer: below 0.8%
- 8. The presence of hydrogen in steel causes
Options- A. reduced neutron absorption cross-section
- B. improved weldability
- C. embrittlement
- D. corrosion resistance Discuss
Correct Answer: embrittlement
- 9. The stiffness is the ability of a material to resist deformation under stress.
Options- A. True
- B. False Discuss
Correct Answer: True
- 10. Y-alloy contains
Options- A. 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
- B. 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
- C. 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
- D. 5 to 6% tin, 2 to 3% copper and rest aluminium Discuss
Correct Answer: 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
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