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Chemical Engineering :: Chemical Engineering Basics-2

  1. Dies for wire drawing are generally made of

  2. A.

     Mild steel

    B.

     Stainless steel

    C.

     Carbides

    D.

     High carbon steel


  3. When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively

  4. A.

     Decreases & increases

    B.

     Increases & increases

    C.

     Increases & decreases

    D.

     Decreases & decreases


  5. Surface tension is due to the __________ forces.

  6. A.

     Viscous

    B.

     Adhesive

    C.

     Cohesive

    D.

     Difference between adhesive & cohesive


  7. Pick out the wrong statement.

  8. A.

     A ferromagnetic material becomes paramagnetic above the 'Curie temperature'

    B.

     Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials

    C.

     Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces

    D.

     Tungsten steel and alnico are not hard magnetic materials


  9. Which of the following is an example of stress corrosion ?

  10. A.

     Season cracking of brass

    B.

     Caustic embrittlement of steel

    C.

     Both (a) & (b)

    D.

     Neither (a) nor (b)


  11. Which of the following is not a characteristic observed in material failure by fatigue fracture ?

  12. A.

     Plastic deformation of material does not occur

    B.

     Initiation of crack from below the surface does not occur

    C.

     Initation of crack occurs on the surface of the machine part

    D.

     Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface


  13. While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.

  14. A.

     1800

    B.

     2000

    C.

     2400

    D.

     3000


  15. The total frictional resistance to fluid flow does not depend upon the

  16. A.

     Roughness of the surface

    B.

     Fluid pressure

    C.

     Fluid density

    D.

     Fluid velocity


  17. Which of the following is a unit of time ?

  18. A.

     Barn

    B.

     Light year

    C.

     Angstrom

    D.

     None of these


  19. In extrusion of metals, which of the following statement is true ?

  20. A.

     Speed of the extruded material is same as that of ram speed

    B.

     Redundant work is a function of the die angle

    C.

     Relative motion between the billet surface and the container wall is always present

    D.

     Hollow ram is used for indirect extrusion