Process Equipment Design Question Paper MCQ - Set 13 - ObjectiveBooks

Process Equipment Design Question Paper MCQ - Set 13

Practice Test: Question Set - 13

1. Commercial packed scrubbers are normally designed for a pressure drop range of _________ mm water column per meter of packed height.
    (A) 4-8
    (B) 17-34
    (C) 52-68
    (D) 88-105

2. The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called
    (A) Downcomer liquid seal
    (B) Static submergence
    (C) Skirt clearance
    (D) None of these

3. The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is
    (A) 0
    (C) 1
    (D) Minimum

4. With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT
    (A) Decreases very rapidly
    (B) Increases very rapidly
    (C) Remains constant
    (D) Increases linearly

5. Overall mass transfer co-efficient in case of absorption of _________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.
    (A) CO2
    (B) SO2
    (C) NH3
    (D) None of these

6. Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of _________ times the paddle diameter.
    (A) 0.1 to 0.25
    (B) 0.3 to 0.5
    (C) 0.5 to 0.6
    (D) 0.65 to 0.80

7. Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to
    (A) 5 cms
    (B) 40% of the I.D. of the shell
    (C) 25 cms
    (D) I.D. of the shell

8. Bubble cap plate column is
    (A) A finite stage contactor
    (B) Used only for distillation, not for absorption
    (C) A differential stage contactor
    (D) A continuous contactor

9. The most common standard size of bubble caps used in industrial operation is
    (A) 1" dia cap with 0.5" dia riser
    (B) 6" dia cap with 4" dia riser
    (C) 8" dia cap with 1" dia riser
    (D) 4" dia cap with 8" dia riser

10. Shortest distance between two tubes is
    (A) Called tube pitch
    (B) Called tube clearance
    (C) More in case of triangular pitch as compared to square pitch of tube layout
    (D) None of these

11. Pick out the wrong statement.
    (A) Plate efficiency increases with increase in superficial vapor velocity till entrainment limit
    (B) Increase in depth of the liquid about the slots increases the plate efficiency, particularly if the liquid depth is < 1"
    (C) Too small a plate spacing can cause a low efficiency, if the vapor velocity is greater than the allowable value
    (D) None of these

12. Rivets are generally specified by the
    (A) Head diameter
    (B) Shank diameter
    (C) Overall length
    (D) None of these

13. Heat transfer co-efficient, hG(Kcal/hr.m2 .°C) and mass velocity of air, G (kg/hr.m2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to
    (A) hG = 1.004G0.37
    (B) 1.004G0.8
    (C) hG = 0.0176G0.37
    (D) 0.0176G1.37

14. If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will _________ times.
    (A) Increase by 1.8
    (B) Decrease by 22
    (C) Increase by 21.6
    (D) None of these

15. Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the
    (A) Flow rates of each fluid
    (B) Type and size of packing
    (C) Concentration of each fluid
    (D) All a, b & c

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