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Chemical Engineering :: Chemical Engineering Basics-2

  1. Three elastic constants for a completely anisotropic elastic material which follows the Hooke's law are young's modulus, elastic limit stress and yield stress. Which of the following properties is most sensitive to increase in strain rate ?

  2. A.

     Tensile strength

    B.

     Elastic limit

    C.

     Proportional limit

    D.

     Yield strength

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  3. Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.

  4. A.

     Fracture

    B.

     Dislocation

    C.

     Slip

    D.

     Twinning

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  5. Strain hardening effect in metals subjected to cold working is due to the __________ mechanism.

  6. A.

     Slip

    B.

     Fracture

    C.

     Winning

    D.

     Dislocation

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  7. Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?

  8. A.

     Anodising

    B.

     Tempering

    C.

     Carburising

    D.

     Annealing

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  9. Which of the following exemplifies resemblence with the extrusion process ?

  10. A.

     Pneumatic ejection of abrasive solid particles through a nozzle

    B.

     Toothpaste pouring out of the tube

    C.

     Ejection of abrasive slurry through an opening

    D.

     Viscous lubricant pouring out through its container's mouth

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  11. Young's modulus of elasticity of a material is the slope of the initial linear portion of the stress-strain curve. It decreases ap-preciablyby

  12. A.

     Alloying additions

    B.

     Heat treatment

    C.

     Cold work

    D.

     Increasing temperature

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  13. Which of the following relatively employs the highest heat transfer surface area in a high pressure boiler ?

  14. A.

     Airpreheater

    B.

     Economiser

    C.

     Steam superheater

    D.

     Furnace water wall

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  15. Out of the following __________ iron has the best capability to bear sudden & excessive shocks.

  16. A.

     White

    B.

     Cast

    C.

     Wrought

    D.

     Pig

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  17. The dew point of moist air becomes __________ with decrease in its relative humidity.

  18. A.

     Less than the wet bulb temperature

    B.

     More than the wet bulb temperature

    C.

     More than the dry bulb temperature

    D.

     Equal to wet bulb temperature

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  19. Carbon percentage in high speed steel tool material is 0.6 to 1.0. The hardness of carbon tool steels is increased, when it is alloyed with

  20. A.

     Vanadium & chromium

    B.

     Silicon

    C.

     Tungsten

    D.

     Manganese

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