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  • Question

  • The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is


  • Options
  • A. < 30
  • B. < 7
  • C. > 7 < 15
  • D. > 20 < 50

  • Correct Answer
  • < 7 

    • Process Equipment and Plant Design problems

    Search Results

    • 1. Hazards associated with the relief valve leakage for extremely hazardous material storage can be taken care of by providing

    • Options
    • A. rupture diaphragm
    • B. dikes
    • C. surge chamber
    • D. none of these
      • Discuss
    • 2. The retention time of material in a rotary dryer depends upon its

    • Options
    • A. rpm
    • B. slope & length
    • C. flights arrangement
    • D. all (a), (b) and (c)
      • Discuss
    • 3. Pressure drop due to pipe fittings can be estimated by the equation,
      , where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of (dimensionless) for 45° elbow and 180° close return bends would be respectively around

    • Options
    • A. 5 and 10
    • B. 45 and 75
    • C. 180 and 300
    • D. 300 and 500
      • Discuss
    • 4. Nominal size of a pipe is an indication of its __________ diameter.

    • Options
    • A. inner
    • B. outer
    • C. approximate
    • D. none of these
      • Discuss
    • 5. The absorption factor is defined as (where, S1 = slope of the equilibrium curve, S2 = slope of the operating line)

    • Options
    • A. S1/S2
    • B. S1.S2
    • C. S2/S1
    • D. 1/S1.S2
      • Discuss
    • 6. The normal range of velocity of steam in pipes is __________ m/sec.

    • Options
    • A. 0.1-0.5
    • B. 1-5
    • C. 10-20
    • D. 80-100
      • Discuss
    • 7. Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is __________ the longitudinal stress.

    • Options
    • A. half
    • B. equal to
    • C. twice
    • D. eight times
      • Discuss
    • 8. In the agitators, the power required will be changed with the increase of diameter of agitator (D) as

    • Options
    • A. D2
    • B. D5
    • C. D
    • D. D9
      • Discuss
    • 9. With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT

    • Options
    • A. decreases very rapidly
    • B. increases very rapidly
    • C. remains constant
    • D. increases linearly
      • Discuss
    • 10. An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by

    • Options
    • A. an increase in liquid viscosity.
    • B. an increase in relatived volatility for rectification columns.
    • C. decrease in gas solubility for absorbers.
    • D. all (a), (b) and (c).
      • Discuss

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