Equipment & plant Design Chemical Engineering Questions - Set 18 - ObjectiveBooks
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Equipment & plant Design Chemical Engineering Questions - Set 18

Practice Test: Question Set - 18


1. The retention time of material in a rotary dryer depends upon its
    (A) rpm
    (B) Slope & length
    (C) Flights arrangement
    (D) All (a), (b) and (c)

2. Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.
    (A) Tube dia is 3-6 cms, while tube length in 3-6 meters
    (B) Steam is fed to the shell, whereas the liquor is filled inside the tube
    (C) Liquor level is maintained at 1/3rd to 1/2 of the height of the tube
    (D) None of these

3. Number of evaporators which can be used in service in a multiple effect evaporation system is limited by the
    (A) Practical limit reached, due to low heat transfer rate because of inadequate temperature difference
    (B) Economic limit reached, when the plant cost exceeds the saving of steam
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

4. The units of Young's modulus of elasticity and _________ are the same.
    (A) Strain
    (B) Stress
    (C) Modular ratio
    (D) None of these

5. A high vapor velocity is required for high plate efficiency in a sieve plate column. The satisfactory value of operating vapor velocity for design purpose in sieve plate column is about _________ percent of the flooding velocity.
    (A) 45
    (B) 60
    (C) 80
    (D) 95

6. Vertical vessels are not supported by
    (A) Brackets
    (B) Skirts
    (C) Columns
    (D) Saddles

7. Tube side heat transfer co-efficient for turbulent flow of liquid through tubes is proportional to
    (A) G0.2
    (B) G0.5
    (C) G0.8
    (D) G1.5

8. Baffle width is normally taken as _________ times the tank diameter.
    (A) 0.1-0.12
    (B) 0.4-0.5
    (C) 0.45-0.6
    (D) 0.2-0.45

9. Thickness of the frame of a plate and frame filter as compared to that of plates is
    (A) Less
    (B) Same
    (C) More
    (D) Either (a) or (b)

10. Rotary driers are most economically designed for the number of heat transfer units (HTU) from
    (A) 0.01 to 1
    (B) 1.5 to 2.5
    (C) 5 to 10
    (D) 10 to 20

11. Lap joints are preferred for plates having thickness _________ mm.
    (A) < 12.5
    (B) > 3
    (C) > 5
    (D) 5-10

12. Spherical shaped pressure vessel is considered to be the most ideal, because it can
    (A) Withstand higher pressure for a given metallic shell thickness
    (B) Be fabricated very easily
    (C) Be designed without wind load considerations
    (D) Be supported very easily

13. Hazards associated with the relief valve leakage for extremely hazardous material storage can be taken care of by providing
    (A) Rupture diaphragm
    (B) Dikes
    (C) Surge chamber
    (D) None of these

14. A cylindrical storage tank can have a self supported conical roof,
    (A) If its diameter is less than 15-20metres
    (B) If its diameter is more than 50 meters
    (C) If the thickness of the roof is more than that of the cylindrical shell
    (D) Irrespective of its diameter

15. Compensation against openings in process vessels for giving inlet and outlet connections, for providing sight glasses and manholes etc. is provided for strength and rigidity. The most efficient type of compensation is of _________ type.
    (A) Nozzle or rim
    (B) Flared out
    (C) Fluid in
    (D) Ring plate

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