Process Equipment and Plant Design

21. 25 per cent cut segmental baffle means that the baffle

1. Height is 75% of the I.D. of the shell
2. Height is 25% of the I.D. of the shell
3. Spacing is 75% of its height
4. Width is 25% of its height

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22. A 'rupture disc' is provided in chemical equipments as an accessory meant for

1. Relieving excess pressure
2. Creating turbulence
3. Enhancing mixing rate
4. Avoiding vortex formation

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23. A binary liquid Azeotropic mixture has boiling point higher than either of the components, when it shows _________ deviation from Raoult's Law.

1. Positive
2. Negative
3. No
4. None of these

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24. A binary liquid Azeotropic mixture has boiling point lower than either of the components, when it shows _________ deviation from Raoult's Law.

1. Positive
2. Negative
3. No
4. None of these

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25. A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design

1. Only if the opening is on spherical vessel
2. Only if the opening is on a vertical cylindrical vessel
3. Only if the opening is on a horizontal cylindrical vessel
4. Irrespective of the shape of the vessel

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26. A cylindrical pressure vessel of volume 6 πm3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm² and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to

1. 5 mm
2. 6 mm
3. 8 mm
4. 10 mm

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27. A cylindrical storage tank can have a self supported conical roof,

1. If its diameter is less than 15-20metres
2. If its diameter is more than 50 meters
3. If the thickness of the roof is more than that of the cylindrical shell
4. Irrespective of its diameter

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28. A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

1. Is economical in operation
2. Employs high velocity, high heat transfer rate and less heating surface requirement
3. Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle
4. Both (B) & (C)

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29. A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

1. Central dished section and corner torus section
2. Corner torus section and central dished section
3. Central dished section and straight flange section
4. Straight flange section and corner torus section

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30. A high vapour 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.

1. 45
2. 60
3. 80
4. 95

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