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Chemical Engineering :: Chemical Engineering Basics-2

  1. A freely floating object is stable, if its centre of buoyancy

  2. A.

     Coincides with its centre of gravity

    B.

     Lies below its centre of gravity

    C.

     Lies below its metacentre

    D.

     None of these


  3. __________ welding will be the most suitable for butt welding two 20 cms thick boiler drum mild steel plates.

  4. A.

     Electrical resistance

    B.

     Electroslag

    C.

     Plasma torch

    D.

     Submerged arc


  5. An atom bomb works on the principle of

  6. A.

     Nuclear fission

    B.

     Nuclear fusion

    C.

     Both the nuclear fission & fusion

    D.

     Ionisation


  7. Damage to metal surface by mechanical action is called

  8. A.

     Pitting

    B.

     Corrosion

    C.

     Erosion

    D.

     None of these


  9. Screws are specified by their __________ diameters.

  10. A.

     Minor

    B.

     Major

    C.

     Pitch

    D.

     None of these


  11. The following is a typical anionic collector used in flotation.

  12. A.

     Ethyl dixanthogen

    B.

     Trimethyl cetyl ammonium bromide

    C.

     Potassium ethyl xanthate

    D.

     LAuryl amine hydrochloride


  13. With increase in compression ratio, the volumetric efficiency of air compressor

  14. A.

     Increases

    B.

     Decreases

    C.

     Remains same

    D.

     May increase or decrease (depends on the suction pressure)


  15. The thickness of oxide film is y at time t. If K₁, K₂ and K₃ are the temperature dependent constants, the parabolic law of oxidation is given by

  16. A.

     y² = 2k₁t + k₂

    B.

     y = k₁ ln (k₂t + k₃)

    C.

     y = k₁ t + k₂

    D.

     y = k₁t³ + k₂


  17. What is the range of tempering temperature (°C) for most of the materials ?

  18. A.

     75-100

    B.

     200-300

    C.

     350-450

    D.

     500-600


  19. Streaklines, streamlines & pathlines are almost identical for __________ fluid flow.

  20. A.

     Ideal

    B.

     Uniform

    C.

     Steady

    D.

     None of these