Chemical Plant Design Multiple Choice Questions - Set 02 - ObjectiveBooks

Chemical Plant Design Multiple Choice Questions - Set 02

Practice Test: Question Set - 02

1. Stress-strain diagram for low carbon steel/mild steel is shown below in the Fig. The point 'A' on the Fig. represents the

    (A) Breaking stress
    (B) Ultimate stress
    (C) Elastic limit
    (D) Yield point

2. Power required for agitation depends upon the
    (A) Height & properties of the liquid
    (B) Agitator type & speed of agitation
    (C) Size of agitator & the tank
    (D) All (a), (b) and (c)

3. High pressure fluid in a shell and tube heat exchanger should preferably be routed through the
    (A) Tubes to avoid the expansion of high pressure shell construction
    (B) Shell side for smaller total pressure drop
    (C) Shell side, if the flow is counter-current and tube side if the flow is co-current
    (D) Shell side for large overall heat transfer co-efficient

4. Stage efficiency for packed tower varies with the
    (A) Type & size of packing
    (B) Fluid rates and fluid properties
    (C) Operating pressure and column diameter
    (D) All (a), (b) and (c)

5. What is the slope of the feed line, if the feed to a distillation column is a saturated liquid?
    (A) 0
    (C) > 1
    (D) < 1

6. Tube wall thickness depends on the corrosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than _________ mm outside diameter is generally not recommended for fouling fluids.
    (A) 16
    (B) 19
    (C) 28
    (D) 38

7. _________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids.
    (A) Sieve plate
    (B) Packed
    (C) Bubble cap plate
    (D) None of these

8. In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around
    (A) 0.5
    (B) 1.5
    (C) 2.5
    (D) 3.5

9. For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell
    (A) Decreases upwards
    (B) Increases upwards
    (C) Remains same throughout
    (D) May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell

10. In a shell and tube heat exchanger, the shortest center to center distance between the adjacent tubes is
    (A) Called tube pitch
    (B) Called tube clearance
    (C) Always less than the diameter of the tube
    (D) None of these

11. Pick out the wrong statement.
    (A) If sufficient residence time (around 8 seconds) is not provided to the downcoming liquid in the downcomer, it may entrain some vapor
    (B) The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding
    (C) The discharge end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble caps
    (D) None of these

12. If 'D' is the inside diameter of the shell of a shell and tube heat exchanger, then the baffle spacing is usually in the range of
    (A) D/2 or minimum 2" to 5D
    (B) D/5 or minimum 2" to 5Dv
    (C) D/5 or minimum 2" to D
    (D) None of these

13. For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec, ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)
    (A) Di, opt = 3.9 Q0.45 ρ0.13
    (B) Di, opt = 3.9 Q0.45. μ0.95
    (C) Di, opt = 4.7 Q0.36. μ3.2ρ0.13
    (D) Di, opt = 3 Q0.36. μ0.88

14. Scale up problem in design based on the similarity concept takes into account _________ similarity.
    (A) Geometrical
    (B) Kinematic
    (C) Dynamic
    (D) All (a), (b) and (c)

15. Weep holes provided in the plates of a distillation column
    (A) Facilitate draining out liquid from a tray when the unit is not in operation
    (B) Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid
    (C) Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation
    (D) All (a), (b) and (c)

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