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  • Question
  • 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%).

  • Correct Answer
  • Cu (55%) & Ni (45%). 


  • Materials and Construction problems


    Search Results


    • 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
    • 2. Ceramic recuperators are generally made of

    • Options
    • A. silicon carbide.
    • B. calcium carbide.
    • C. fireclay bricks.
    • D. high alumina bricks.
    • Discuss
    • 3. Heavy duty bearings are usually made of

    • Options
    • A. white metal
    • B. phosphorous bronze
    • C. monel
    • D. zinc
    • Discuss
    • 4. White cast iron is not

    • Options
    • A. malleable
    • B. whitish in color
    • C. brittle
    • D. strong and hard
    • Discuss
    • 5. Invar used in thermocouples is an alloy of nickel and

    • Options
    • A. iron
    • B. copper
    • C. chromium
    • D. lead
    • Discuss
    • 6. 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
    • 7. 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
    • 8. Presence of nickel in steel improves its

    • Options
    • A. corrosion resistance.
    • B. cutting ability.
    • C. wear resistance.
    • D. all (a), (b) and (c).
    • Discuss
    • 9. Shock resisting steels should possess high

    • Options
    • A. hardness
    • B. toughness
    • C. tensile strength
    • D. wear resistance
    • Discuss
    • 10. Acetylene gas holder is made of

    • Options
    • A. copper
    • B. cast iron
    • C. steel
    • D. monel metal
    • Discuss


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