Chemical Engineering Plant Design Process MCQ - Set 16 - ObjectiveBooks

Chemical Engineering Plant Design Process MCQ - Set 16

Practice Test: Question Set - 16

1. Apex angle of conical heads used in the bottom heads of chemical process equipments is usually
    (A) 30°
    (B) 45°
    (C) 60°
    (D) 75°

2. Cylindrical pressure vessels in horizontal condition is generally supported on a _________ support.
    (A) Lug
    (B) Skirt
    (C) Saddle
    (D) Guy wire

3. Length to diameter ratio of most rotary driers is in the range of
    (A) 1 to 2
    (B) 4 to 10
    (C) 10 to 20
    (D) 20 to 30

4. In case of design of a shell and tube heat exchanger,
    (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 meters
    (D) All (a), (b) & (c)

5. For identical situation, condensing film coefficient in case of a horizontal condenser is almost _________ the value expected in case of vertical condenser.
    (A) Half
    (B) Twice
    (C) Thrice
    (D) Five times

6. With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter
    (A) Increases
    (B) Decreases
    (C) Remain unaffected
    (D) None of these

7. The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is
    (A) < 30
    (B) < 7
    (C) > 7 < 15
    (D) > 20 < 50

8. The equivalent diameter for pressure drop is _________ that for heat transfer.
    (A) Smaller than
    (B) Greater than
    (C) Equal to
    (D) Not related with

9. Cooling water fouling factors vary in the range of 0.001 to 0.003
    (A) (BTU/hr.ft2. °F)-1
    (B) (kcal/hr.m2.°C)-1
    (C) (W/m2.°K)-1
    (D) (kcal/hr. m. °C)-1

10. _________ liquor is best handled in a long tube vertical evaporator.
    (A) Foamy
    (B) Scaling
    (C) Viscous
    (D) Salting

11. Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?
    (A) Triangular pitch
    (B) Square pitch
    (C) Diagonal square pitch
    (D) Heat transfer rate is independent of tube arrangement

12. Pick out the wrong statement about the design of a sieve plate column.
    (A) An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns
    (B) For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design
    (C) Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 meters and 100 mm for larger diameter columns
    (D) Minimum recommended downcomer residence time for the disengagement of entrained vapor is the same for both foaming and non-foaming liquids, which is about 20 seconds

13. A binary liquid Azeotropic mixture has boiling point higher than either of the components, when it shows _________ deviation from Raoult's Law.
    (A) Positive
    (B) Negative
    (C) No
    (D) None of these

14. In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube?
    (A) Long tube vertical evaporator
    (B) Short tube vertical evaporator
    (C) Horizontal tube evaporator
    (D) None of these

15. LMTD correction factor is used in heat exchanger design for
    (A) Double pipe heat exchanger
    (B) Multipass shell and tube heat exchanger
    (C) Fouling fluids
    (D) Counter flow of hot and cold fluids

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