Question 61 : Steam economy in case of a triple effect evaporator will be
1. <1
2. between 0 and 1
3. >1
4. 1
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Question 62 : Which of the following is the most widely used heat insulating material for pipelines carrying steam ?
1. Fireclay refractory followed by aluminium sheet.
2. Tar dolomite bricks followed by asbestos.
3. Cotton followed by aluminium foil.
4. 85% magnesia cement and glass wool.
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Question 63 : The purpose of providing expansion bellows in the shell of tubular exchanger is to
1. increase the heating load.
2. account for the uneven expansion of shell and tube bundles.
3. impart structural strength.
4. facilitate increase of shell length, if needed.
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Question 64 : A __________ evaporator employs an annular downtake.
1. basket type
2. horizontal
3. none of these
4. long tube vertical
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Question 65 : Evaporation by thermocompression results in the
1. realisation of multiple effect economy in a single effect
2. saving of steam.
3. none of these.
4. Both realisation of multiple effect economy in a single effect and saving of steam
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Question 66 : In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid
1. and the wall is not related.
2. is inversely proportional to the resistance across which the drop occurs.
3. and the wall are proportional to individual resistances.
4. none of these.
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Question 67 : Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.
1. 30
2. 10
3. 1
4. 20
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Question 68 : In case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is
1. more
2. more or less; depends on the nature of solution
3. same
4. less
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Question 69 : In Biot number, the characteristic length used is the ratio of the __________ of the solid.
1. volume to surface area
2. surface area to perimeter
3. surface area to volume
4. perimeter to surface area
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Question 70 : Multiple effect evaporation accounts for
1. lower operating costs
2. steam economy
3. investment economy
4. none of these
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