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Chemical Engineering :: Chemical Engineering Basics-2

  1. Fire in fuel gas pipelines is extinguished most effectively by

  2. A.

     Spraying water

    B.

     Blanketting the area with nitrogen atmosphere

    C.

     Fire fighting foam

    D.

     None of these


  3. Boiling point of water gets lowered at high altitudes (e.g., hills), because

  4. A.

     Temperature is low

    B.

     Atmospheric pressure is low

    C.

     Atmospheric pressure is high

    D.

     None of these


  5. Desert air coolers being rendered ineffective in rainy season is due to

  6. A.

     Low humidity

    B.

     Low temperature

    C.

     High humidity

    D.

     Sunny weather


  7. Auto collimator is used to check

  8. A.

     Flatness

    B.

     Angle

    C.

     Rotor balancing

    D.

     Roughness


  9. About __________ ton of coke is required in a cupola to produce one ton of casting.

  10. A.

     0.03

    B.

     0.3

    C.

     0.8

    D.

     1.5


  11. The most commonly used moderator in nuclear power plants is

  12. A.

     Graphite

    B.

     Light water

    C.

     Heavy water

    D.

     Berellium


  13. Role of a "collector" in froth floatation is to

  14. A.

     Form a water repelling film on the mineral surface

    B.

     Create and stabilise the froth

    C.

     Act as a surface

    D.

     Collect the minerals according to their specific gravity


  15. Pick out the wrong statement.

  16. A.

     In Parke's process, zinc is added to remove silver from lead

    B.

     In the Pidgeon process of producing magnesium, powdered ferro-silcon is used as the reducing agent

    C.

     Molten lead is used for shock cooling of the zinc vapours in the zinc blast furnace

    D.

     Pure copper electrodes are used as anode for electro-refinning of copper


  17. The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.

  18. A.

     Refrigerant cooling

    B.

     Evaporator

    C.

     Condenser

    D.

     Throttling


  19. A reduction in thermal resistance during heat transfer does not occur in the

  20. A.

     Convection heat transfer by stirring the fluid and cleaning the heating surface

    B.

     Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity

    C.

     Radiation heat transfer by increasing the temperature and reducing the emis-sivity

    D.

     None of these