Process Equipment and Plant Design

291. The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about _________ mm of water column per metre height of packing.

1. 43952
2. 20-40
3. 100-150
4. 1000-1500

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292. The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the

1. Equal sized reactors are the best
2. Smaller reactor should come first
3. Larger reactor should come first
4. None of these

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293. The practical representative values of HETP for a number of commercial operations lies within a range of _________ metre.

1. 0.1-0.2
2. 0.2-0.5
3. 0.4-0.9
4. 1.2-1.5

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294. The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is

1. 0.25
2. 0.5
3. 0.75
4. 1.25

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295. The ratio of down take area to cross-sectional area of the tube, for calandria type evaporator ranges from

1. 0.5 to 1
2. 1 to 1.5
3. 1.5 to 2
4. 2 to 2.5

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296. The ratio of lateral strain to linear strain is termed as the

1. Poisson's ratio
2. Bulk modulus
3. Modulus of elasticity
4. Shear modulus

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297. The ratio of linear stress to linear strain is termed as the

1. Modulus of elasticity
2. Modulus of rigidity
3. Bulk modulus
4. None of these

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298. The ratio of shear stress to shear strain is called

1. Bulk modulus
2. Shear modulus
3. Modulus of rigidity
4. Modulus of elasticity

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299. The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the _________ stress.

1. Yield point
2. Breaking
3. Ultimate
4. None of these

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300. The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from

1. 2 to 3
2. 3 to 5
3. 4 to 8
4. 6 to 12

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