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  • Question
  • In extrusion of metals, which of the following statement is true?


  • Options
  • 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.

  • Correct Answer
  • Hollow ram is used for indirect extrusion. 


  • More questions

    • 1. In case of design of a shell and tube heat exchanger,

    • Options
    • A. minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch.
    • B. minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter.
    • C. O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres.
    • D. all (a), (b) & (c).
    • Discuss
    • 2. In shell and tube heat exchangers, straight tie rods are used to

    • Options
    • A. hold baffle in space.
    • B. fix the tubes in position.
    • C. account for thermal strain.
    • D. none of these.
    • Discuss
    • 3. TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.

    • Options
    • A. 5
    • B. 100
    • C. 1000
    • D. 2000
    • Discuss
    • 4. The chamber process is

    • Options
    • A. preferred over contact process for producing 98 to 100% H2SO4 and various oleums.
    • B. non-catalytic and operates only on pyrites.
    • C. a batch process for directly producing high strength (98 to 100%) H2SO4.
    • D. none of these.
    • Discuss
    • 5. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.

    • Options
    • A. 1520
    • B. 1630
    • C. 1670
    • D. 1730
    • Discuss
    • 6. Ideal solution is formed, when its components have zero

    • Options
    • A. heat of mixing.
    • B. volume change.
    • C. both (a) & (b).
    • D. neither (a) nor (b).
    • Discuss
    • 7. Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult's law is proportional to the

    • Options
    • A. temperature.
    • B. volume of solution.
    • C. moles of non-volatile solute.
    • D. none of these.
    • Discuss
    • 8. For the transportation of ultrafine particles, the equipment used is a........conveyor.

    • Options
    • A. belt
    • B. pneumatic
    • C. screw
    • D. none of these
    • Discuss
    • 9. Physical absorption is

    • Options
    • A. an irreversible phenomenon.
    • B. a reversible phenomenon.
    • C. accompanied by evolution of heat.
    • D. both (b) and (c)
    • Discuss
    • 10. Name the endothermic reaction out of the following:

    • Options
    • A. Catalytic cracking.
    • B. Hydrocracking.
    • C. Dehydrogeneration of naphthene to produce aromatic.
    • D. Catalytic polymerisation.
    • Discuss


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