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Materials and Construction problems

  • 1. Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by

  • Options
  • A. dilute HCI
  • B. acetic acid
  • C. concentrated H2SO4
  • D. none of these
    • Discuss
  • 2. Babbit metal used for bearings is a____base alloy.

  • Options
  • A. tin
  • B. lead
  • C. aluminium
  • D. copper
    • Discuss
  • 3. Nickel (56%) and molybdenum (17%) alloys are called

  • Options
  • A. monel
  • B. hastealloy C
  • C. inconel
  • D. bronzes
    • Discuss
  • 4. 18-4-1 high speed steel contains 18%, 4% and 1% respectively of

  • Options
  • A. tungsten, vanadium and chromium
  • B. tungsten, chromium and vanadium
  • C. vanadium, chromium and tungsten
  • D. chromium, tungsten and vanadium
    • Discuss
  • 5. German silver in an alloy of

  • Options
  • A. copper, nickel and zinc.
  • B. copper, aluminium and silver.
  • C. silver, zinc and aluminium.
  • D. silver, nickel and zinc.
    • Discuss
  • 6. Which of the following stainless steels is non-magnetic?

  • Options
  • A. Ferritic
  • B. Martensitic
  • C. Austenitic
  • D. None of these
    • Discuss
  • 7. Invar used in thermocouples is an alloy of nickel and

  • Options
  • A. iron
  • B. copper
  • C. chromium
  • D. lead
    • Discuss
  • 8. White cast iron is not

  • Options
  • A. malleable
  • B. whitish in color
  • C. brittle
  • D. strong and hard
    • Discuss
  • 9. Heavy duty bearings are usually made of

  • Options
  • A. white metal
  • B. phosphorous bronze
  • C. monel
  • D. zinc
    • Discuss
  • 10. Ceramic recuperators are generally made of

  • Options
  • A. silicon carbide.
  • B. calcium carbide.
  • C. fireclay bricks.
  • D. high alumina bricks.
    • Discuss

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