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  • Question
  • The purpose of nitriding the steel is to


  • Options
  • A. harden its surface.
  • B. soften its surface.
  • C. improve its reliability.
  • D. none of these.

  • Correct Answer
  • harden its surface. 


  • Materials and Construction problems


    Search Results


    • 1. Cast irons are generally specified by their

    • Options
    • A. carbon content
    • B. tensile strength
    • C. hardness
    • D. manufacturing proces
    • Discuss
    • 2. The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials.

    • Options
    • A. non-crystalline solid
    • B. crystalline
    • C. rubberry
    • D. non-crystalline organic polymeric.
    • Discuss
    • 3. Coke oven regenerators are made of __________ bricks.

    • Options
    • A. fire clay
    • B. silica
    • C. low thermal conductivity
    • D. high electrical conductivity
    • Discuss
    • 4. Zinc is not used

    • Options
    • A. for producing zinc base die casting alloys.
    • B. in its oxide form as pigments.
    • C. as anode for corrosion prevention in boiler.
    • D. as an alloying element in various bronzes.
    • Discuss
    • 5. The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.

    • Options
    • A. 0.2
    • B. 2
    • C. 4
    • D. 8
    • Discuss
    • 6. Galvanised iron is

    • Options
    • A. harder
    • B. protected from rusting
    • C. alumina coated iron
    • D. none of these
    • Discuss
    • 7. Which of the following has the highest compressive strength?

    • Options
    • A. Wrought iron
    • B. Cast iron
    • C. Mild steel
    • D. High carbon steel
    • Discuss
    • 8. Cast iron has very high

    • Options
    • A. compressive strength
    • B. ductility
    • C. shock resistance
    • D. resistance to brittleness
    • Discuss
    • 9. German silver used for decorative purposes contains maximum percentage of

    • Options
    • A. silver
    • B. copper
    • C. zinc
    • D. nickel
    • Discuss
    • 10. Dielectric strength of a material is

    • Options
    • A. its energy stroage capacity.
    • B. a magnetic property.
    • C. its capacity to resist the flow of current.
    • D. its capacity to withstand high voltage.
    • Discuss


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