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Home ‣ Chemical Engineering ‣ Process Equipment and Plant Design Comments
  • Question

  • 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)

  • Correct Answer
  • all (a), (b) and (c) 

    • Process Equipment and Plant Design problems

    Search Results

    • 1. 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
    • 2. Nominal size of a pipe is an indication of its __________ diameter.

    • Options
    • A. inner
    • B. outer
    • C. approximate
    • D. none of these
      • Discuss
    • 3. 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
    • 4. Apex angle of conical heads used in the bottom heads of chemical process equipments is usually

    • Options
    • A. 30°
    • B. 45°
    • C. 60°
    • D. 75°
      • Discuss
    • 5. In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.

    • Options
    • A. molal flow rate of vapour
    • B. vapour molecular weight
    • C. pressure and temperature
    • D. all (a), (b) and (c)
      • Discuss
    • 6. 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
    • 7. 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
      • Discuss
    • 8. 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
    • 9. 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
    • 10. 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

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