__________ of water makes it a widely used coolant in heat exchangers. Low corro

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Question
__________ of water makes it a widely used coolant in heat exchangers.
Options
A. Low corrosiveness
B. Low dirt factor
C. High specific heat
D. Low viscosity

Correct Answer

High specific heat

Process Equipment and Plant Design problems

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1. In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.
Options
A. 1/10-1/15th
B. 1/5-1/10th
C. 1/20-1/30th
D. 1/2 to 1/4th

2. Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.
Options
A. less
B. more
C. same
D. either (a) or (b); no generalisation can be made

3. Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is
Options
A. more
B. less
C. same
D. more or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein.

4. For a cylinderical vessel of moderate height, the weld joint efficiency for joints parallel to the cylinderical axis is given as 1.0, while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylinderical vessel, what value of weld joint efficiency should be used?
Options
A. 0.8
B. 0.9
C. 1.0
D. (0.8)^0.5

6. Pick out the wrong statement.
Options
A. Plate efficiency increases with increase in superficial vapour 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 vapour velocity is greater than the allowable value.
D. none of these.

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

8. In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.
Options
A. 0.5 to 1.5
B. 2.5 to 4.0
C. 5 to 10
D. 10 to 15

9. Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger?
Options
A. 75% cut segmental baffle.
B. 25% cut segmental baffle.
C. Orifice baffle.
D. Disk and doughnut baffle.

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

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