Materials and Construction problems
- 1. The metals occuring at the lower most position in the electromotive series
Options- A. do not resist corrosion.
- B. resist corrosion very strongly.
- C. are very brittle.
- D. are heat insulators. Discuss
Correct Answer: resist corrosion very strongly.
- 2. Constantan is an alloy of
Options- A. Cu (55%) & Sn (45%).
- B. Cu (55%) & Ni (45%).
- C. Pt (95%) & Rh (10%).
- D. Fe (80%) & Ni (20%). Discuss
Correct Answer: Cu (55%) & Ni (45%).
- 3. The main purpose of galvanising iron sheets is to
Options- A. harden the surface.
- B. increase its glossiness and lustre.
- C. prevent the action of water.
- D. prevent the action of oxygen. Discuss
Correct Answer: prevent the action of water.
- 4. Sulphur melting pit in the sulphuric acid plant is made of
Options- A. lead lined stainless steel.
- B. cast iron.
- C. steel or cement-brick lined.
- D. hard wood. Discuss
Correct Answer: steel or cement-brick lined.
- 5. Presence of nickel in steel improves its
Options- A. corrosion resistance.
- B. cutting ability.
- C. wear resistance.
- D. all (a), (b) and (c). Discuss
Correct Answer: corrosion resistance.
- 6. Shock resisting steels should possess high
Options- A. hardness
- B. toughness
- C. tensile strength
- D. wear resistance Discuss
Correct Answer: toughness
- 7. Acetylene gas holder is made of
Options- A. copper
- B. cast iron
- C. steel
- D. monel metal Discuss
Correct Answer: steel
- 8. Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)?
Options- A. Invar
- B. Constantan
- C. Chromel
- D. Alumel Discuss
Correct Answer: Invar
- 9. Aluminium as a material of construction suffers from the disadvantage of
Options- A. very high cost.
- B. rather low tensile strength.
- C. very low strength to weight ratio.
- D. scarce availability. Discuss
Correct Answer: rather low tensile strength.
- 10. The addition of antimony in tin-based alloys improves its
Options- A. rupture strength and hot hardness.
- B. impact strength and bonding strength.
- C. deformation resistance.
- D. wear resistance. Discuss
Correct Answer: deformation resistance.
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