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Chemical Engineering :: Chemical Engineering Basics-2

  1. In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

  2. A.

     Range is 15°F

    B.

     Approach is 10°F

    C.

     Both A & B

    D.

     Neither A nor B


  3. Change in volume of metals from absolute zero temperature to their melting points is

  4. A.

     Almost same for all metals

    B.

     Different for different metals

    C.

     Less for low melting point metals

    D.

     Less for high melting point metals


  5. The most serious manufacturing defect from fracture toughness point of view is

  6. A.

     Surface roughness

    B.

     Pores

    C.

     Spherical inclusion

    D.

     Crack


  7. Unit of surface tension in S.I. unit is

  8. A.

     Watt/m

    B.

     Joule/m²

    C.

     Newton/m²

    D.

     Joule/m


  9. Limestone is added in the blast furnace (during pig iron manufacture) to

  10. A.

     Form slag by combining with impurities

    B.

     Supply heat by undergoing exothermic reaction with impurities

    C.

     Reduce the coke consumption

    D.

     Reduce slag viscosity


  11. The following thermocouple may be used for measuring temperature upto 1873°K.

  12. A.

     Chromel-alumel

    B.

     Copper-constantan

    C.

     Platinum-platinum rhodium

    D.

     Iron-constatan


  13. Pick out the correct combination about the role of various additives used in polymers.

  14. A.

     Plasticiser : increases the polymer strength

    B.

     Heat stabiliser : increases the maximum service temperature

    C.

     Fillers: Does not affect the property of polymer but increases its weight

    D.

     Lubricants: increases the flexibility of polymers


  15. Which of the following does not discharge the dust collected as a dry solid?

  16. A.

     Electrostatic precipitator

    B.

     Wet scrubber

    C.

     Bag filter

    D.

     Gravity settling chamber


  17. All of the following alloying elements of steel increases hardness but sacrifice ductility, except

  18. A.

     Nickel

    B.

     Vanadium

    C.

     Molybdenum

    D.

     Chromium


  19. If the pH value of a solution of sodium chloride is 7; then what will be the pH value of the solution after its electrolysis ?

  20. A.

     7

    B.

     < 7

    C.

     > 7

    D.

     0