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Chemical Engineering :: Materials and Construction

  1. The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials.

  2. A.
    non-crystalline solid
    B.
    crystalline
    C.
    rubberry
    D.
    non-crystalline organic polymeric.

  3. Coke oven regenerators are made of __________ bricks.

  4. A.
    fire clay
    B.
    silica
    C.
    low thermal conductivity
    D.
    high electrical conductivity

  5. 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) ?

  6. A.
    Invar
    B.
    Constantan
    C.
    Chromel
    D.
    Alumel

  7. Shock resisting steels should possess high

  8. A.
    hardness
    B.
    toughness
    C.
    tensile strength
    D.
    wear resistance

  9. The purpose of nitriding the steel is to

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

  11. Ceramic recuperators are generally made of

  12. A.
    silicon carbide.
    B.
    calcium carbide.
    C.
    fireclay bricks.
    D.
    high alumina bricks.

  13. Hammers and railway rails are normally made of

  14. A.
    mild steel
    B.
    dead mild steel
    C.
    medium carbon steel
    D.
    high carbon steel

  15. Softness of silver can be converted into hardness by alloying it with small quantity of

  16. A.
    copper & nickel
    B.
    zinc
    C.
    aluminium
    D.
    tin

  17. The addition of antimony in tin-based alloys improves its

  18. A.
    rupture strength and hot hardness.
    B.
    impact strength and bonding strength.
    C.
    deformation resistance.
    D.
    wear resistance.

  19. The melleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the miximum malleability ?

  20. A.
    Lead
    B.
    Copper
    C.
    Aluminium
    D.
    Wrought iron