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  • Question
  • Overall distillation column efficiency for most of the refinery columns can be given by (for ? = 0.07 - 1.4 cp and relative volatility < 4) (where ? = overall column efficiency, % ? = molal average viscosity of feed at average column temperature and pressure, cp ?p = pressure drop per tray, psi)


  • Options
  • A. ? = 17 - 61.1 log ?
  • B. Overall distillation column efficiency for most of the refinery columns can be given by (for ? = 0.0
  • C. ? = 1.66 - 0.25 log ?
  • D. ? = 0.25 log ? - 1.67

  • Correct Answer
  • ? = 17 - 61.1 log ? 


  • More questions

    • 1. Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve)

    • Options
    • A. S2/S1
    • B. S1/S2
    • C. S1 - S2
    • D. S1 x S2
    • Discuss
    • 2. Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a

    • Options
    • A. thermocouple
    • B. reistance thermometer
    • C. mercury in glass thermometer
    • D. vapor pressure thermometer
    • Discuss
    • 3. Roof of a basic electric furnace is made of __________ bricks.

    • Options
    • A. superduty fireclay
    • B. silica
    • C. chromite
    • D. none of these
    • Discuss
    • 4. Foot valves provided in pumps are __________ valves.

    • Options
    • A. relief
    • B. three/four way
    • C. pressure reducing
    • D. directional control
    • Discuss
    • 5. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.

    • Options
    • A. < 2
    • B. < 5
    • C. < 8
    • D. < 10
    • Discuss
    • 6. What is the Laplace transform of impulse input having magnitude 'X'?

    • Options
    • A. X
    • B. X2
    • C. 1/X
    • D. 1
    • Discuss
    • 7. Which of the following expressions defines the Baume gravity scale for liquids lighter than water?

    • Options
    • A. °Be = (140/G) - 130
    • B. °Be = 200(G-1)
    • C. °Be = 145 - (145/G)
    • D. °Be = (400/G) - 400
    • Discuss
    • 8. Which is not an acidic refractory?

    • Options
    • A. Silica
    • B. Fireclay
    • C. High alumina refractory
    • D. Carbon black
    • Discuss
    • 9. Which of the following is the best nuclear fuel?

    • Options
    • A. Np- 239
    • B. U-234
    • C. Pu-239
    • D. Th-236
    • Discuss
    • 10. Sulphuric acid mist is arrested by using a __________ scrubber.

    • Options
    • A. packed wet
    • B. hollow wet
    • C. venturi
    • D. co-current
    • Discuss


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