What is the slope of the feed line, if the feed to a distillation column is a sa

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

Correct Answer

1. Souders Brown equation given by, , is used for the calculation of the __________ in a continuous distillation column.
Options
A. diameter of the bubble cap column
B. diameter of the seive plate column
C. tray pressure drop
D. residence time in the downcomer for the disengagement of entrained vapour

2. Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation
Options
A. increases capacity.
B. increases economy.
C. does not affect the capacity.
D. both 'b' & 'c'.

3. A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is
Options
A. bending
B. deformation
C. shear
D. elongation

5. Pick out the wrong statement pertaining to shell and tube heat exchanger.
Options
A. Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle.
B. Baffles are supported independently of the tubes by tie rods and positioned by spacers.
C. Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter.
D. Bracket supports are used for horizontal shell, while saddle support is used for vertical shell.

6. The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always
Options
A. 1
B. < 1
C. >1
D. equal to the order of reaction

7. In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be
Options
A. same as that for fluid flow.
B. less than that for fluid flow.
C. more than that for fluid flow.
D. D₂ - D₁ (D₁ and D₂ are I.D. of inner and outer pipes respectively).

9. Liquid gradient over a tray can be minimised by
Options
A. providing a higher skirt clearance or a higher weir.
B. decreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must flow.
C. using split flow, radial flow or cascade flow for column diameter large than 4 ft.
D. all (a), (b) and (c).

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