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Chemical Engineering :: Chemical Engineering Basics-2

  1. __________ number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical.

  2. A.

     Mach

    B.

     Reynolds

    C.

     Froude

    D.

     Weber


  3. Production of a hollow product by inflation of a tube or parison is called the __________ process.

  4. A.

     Blow moulding

    B.

     Calendering

    C.

     Extrusion

    D.

     Injection


  5. The maximum percentage of chromium that can be added to steel is about

  6. A.

     12

    B.

     18

    C.

     24

    D.

     30


  7. Vernier calipers can not be used to measure the

  8. A.

     I.D. & O.D. of the shaft

    B.

     Thickness of parts

    C.

     Depth of holes

    D.

     Clearance between two mating surfaces


  9. The majority charge carriers in p-type silicon are

  10. A.

     Free electrons

    B.

     Ions

    C.

     Conduction electrons

    D.

     Holes


  11. Water hammer is caused in steam carrying pipelines, because of

  12. A.

     Partial condensation of steam

    B.

     Vibration of the pipeline

    C.

     High degree of superheat of steam

    D.

     Its exposure to torrential rain


  13. Cascade control is

  14. A.

     The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller

    B.

     Used when changes in process conditions cause serious upsets in the controlled variable

    C.

     Useful to control flow from temperature

    D.

     All of the above


  15. Case hardening is not done by

  16. A.

     Nitriding

    B.

     Hot dipping

    C.

     Electroplating

    D.

     Both B & C


  17. Cassiterite is an ore of

  18. A.

     Tin

    B.

     Lead

    C.

     Molybdenum

    D.

     Chromium


  19. Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?

  20. A.

     Emissivity of pipe surface

    B.

     Diameter & length of the pipe

    C.

     Temperature of hot pipe surface & that of air in the room

    D.

     None of these