Question 41 : For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is
1. unknown
2. known
3. calculated
4. not required
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Question 42 : Which of the following provides maximum contact surface for a liquid-vapour system?
1. Bubble-cap plate column
2. Seive-plate column
3. Packed tower
4. Wetted wall column
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Question 43 : Rayleigh equation applies to __________ distillation.
1. differential
2. flash
3. molecular
4. equilibrium
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Question 44 : Steam distillation is not recommended to be used, if the
1. azeotropic mixture is to be separated and the final product is miscible with water.
2. material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature.
3. liquids decompose, if distilled directly at atmospheric pressure.
4. material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature.
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Question 45 : Reverse osmosis is also called
1. electrodilysis
2. dialysis
3. diffusion
4. ultrafiltration
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Question 46 : Reboiler is considered as one theoretical plate, because
1. none of these.
2. reboiler itself contains one plate.
3. vapour is recycled to the column.
4. of the assumption that vapour and liquid leaving the reboiler are in equilibrium.
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Question 47 : As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages
1. increase
2. decrease
3. can either increase or decrease, depends on the system
4. remain unchanged
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Question 48 : Rate of adsorption increases as the
1. temperature decreases.
2. temperature increases.
3. pressure decreases.
4. size of adsorbent increases.
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Question 49 : In a gas-liquid absorption coloumn, for obtaining the maximum absorption efficiency
1. by passing should be completely avoided.
2. both gas as well as liquid streams should be distributed uniformly.
3. liquid stream should be distributed uniformly.
4. gas stream should be distributed uniformly.
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Question 50 : In triangular co-ordinates, the ternery composition point falls __________ of the triangle.
1. inside
2. on the sides
3. in the corners
4. none of these.
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