PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

What is the value of 'q' for saturated liquid feed to a distillation column?

>1

1

TRUE ANSWER : ?
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In hydrostatic testing of welded pipe (for leakage, strength etc.) the ratio of minimum hydrostatic test pressure to internal design pressure is around

2.5

0.5

1.5

3.5

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Hold up of material in a operating rotary drier is in the range of

0.5 to 0.8

0.05 to 0.15

0.8 to 0.9

0.25 to 0.50

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Pick out the wrong statement pertaining to shell and tube heat exchanger.

Baffles are supported independently of the tubes by tie rods and positioned by spacers

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

Bracket supports are used for horizontal shell, while saddle support is used for vertical shell

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

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For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

Remains same throughout

May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell

Increases upwards

Decreases upwards

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The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area 'A' is given by (where, P = perimeter of the channel in contact with the fluid)

4 A/P

A/P

√A

4 P/A

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In a pressure vessel containing multiple openings of various dimensions at different parts, stress concentration at the edges of the opening is maximum which becomes negligibly small beyond the area covered by __________ times the hole diameter.

Twenty

Five

Ten

Two

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With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.

Running cost of steam for reboiler

Fixed charges initially

Running cost of cooling water for condenser

Vapour & liquid load both

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Commercial packed scrubbers are normally designed for a pressure drop range of __________ mm water coloumn per metre of packed height.

52-68

88-105

43929

17-34

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Ratio of tube length to shell diameter for a shell and tube heat exchanger is

< 4 : 1 for gas-gas exchangers

8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers

Both B & C

4 : 1 to 8 : 1 for liquid-liquid exchanger

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