Process Equipment and Plant Design

271. The dust collection efficiency of electrostatic precipitator increases with increase in the

1. Gas flow rate
2. Electrode area
3. Both (A) & (B)
4. Neither (A) nor (B)

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272. The ends of a cylindrical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.

1. Flat plate
2. Hemispherical
3. Torispherical
4. Ellipsoidal

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273. 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)

1. 4 A/P
2. A/P
3. 4 P/A
4. √A

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274. The equivalent diameter for pressure drop is _________ that for heat transfer.

1. Smaller than
2. Greater than
3. Equal to
4. Not related with

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275. The force due to wind load acting on a tall vessel depends upon its

1. Shape
2. Outside diameter
3. Height
4. All (A), (B) & (C)

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276. The function of manholes provided in the shell of a distillation column is to

1. Keep a check on the liquid gradient over the plate by direct visual observation
2. Give access to the individual trays for cleaning, maintenance and installation
3. Guard against foaming & entrainment by dumping antifoaming agent through it
4. All (A), (B) and (C)

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277. The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is _________ cms.

1. 5
2. 15
3. 7.5
4. 50

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278. The length of straight rectangular weir used on cross-flow trays is generally _________ the column diameter.

1. 0.6-0.8 times
2. Equal to
3. Twice
4. 2 ft irrespective of (for column > 3 ft diameter)

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279. The LMTD correction factor (FT) is defined as the

1. Ratio of true temperature difference to the LMTD
2. Ratio of LMTD to the true temperature difference
3. Differenced of true temperature difference and the LMTD
4. Geometric mean of the true temperature difference and the LMTD

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280. The longitudinal stress induced in a thin walled cylindrical vessel under internal pressure is

1. pd/2t
2. pd/4t
3. pd/t
4. pd/8t

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