Process Equipment and Plant Design

281. The maximum liquid gradient over a tray must not exceed

1. 0.5" -1.25"
2. 2"-3.5"
3. 5"
4. Half the tray spacing

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282. The minimum baffle height should be

1. Equal to the impeller diameter
2. Twice the impeller diameter
3. Twice the tank diameter
4. 3/4 of the tank height

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283. The minimum plate spacing in most of the petroleum refinery distillation columns (of dia > 3 ft) is normally _________ inches.

1. 6
2. 12
3. 18
4. 36

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284. The minimum shell thickness for tank ≤ 15 metres diameter is limited to _________ mm, for reasons of elastic stability.

1. 2
2. 5
3. 10
4. 15

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285. The minimum tray spacing in distillation column of diameter less than 3 ft is normally _________ inches.

1. 6
2. 18
3. 24
4. 34

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286. The most common standard size of bubble caps used in industrial operation is

1. 1" dia cap with 0.5" dia riser
2. 6" dia cap with 4" dia riser
3. 8" dia cap with 1" dia riser
4. 4" dia cap with 8" dia riser

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287. The necessary wall thickness for a metallic storage vessel is a function of the

1. Ultimate tensile strength (or yield point) of the material and operating temperature
2. Operating pressure and welding/joint efficiency
3. Diameter of the vessel
4. All (A), (B) and (C)

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288. The normal range of velocity of steam in pipes is _________ m/sec.

1. 0.1-0.5
2. 43952
3. 44105
4. 80-100

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289. The normal range of velocity of water in pipes is _________ m/sec.

1. 0.1-0.5
2. 43862
3. 18537
4. 15-30

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290. The operating pressure drop range in a bag filter is about _________ mm water gauge.

1. 50-150
2. 44109
3. 500-1500
4. 1500-2500

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