Chemical Engineering MCQs

Page No. 443

Which is the most suitable for the concentration of foamy & frothy liquors ?


aAgitated film evaporator

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bLong tube vertical evaporator

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cOpen pan evaporator

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dNone of these

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The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?


a1000

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b727

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c800

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d1200

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View Answer 1000

Boiling point elevation of an ideal solution_______________?


aIncreases rapidly with temperature rise

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bDecreases rapidly with temperature rise

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cIn independent of pressure

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dBoth B. and C.

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The main function of baffles provided in a shell and tube heat exchanger is to______________?


aFacilitate the cleaning of outer tube surface

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bEnhance turbulence

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cHold the tubes in position

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dAll A , B & C

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View Answer Enhance turbulence

Steam side heat transfer co-efficient in an evaporator is in the range of ______________ kcal/hr.m2°C?


a10-50

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b100-500

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c1000-1500

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d5000-15000

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View Answer 1000-1500

The ratio of total radiating power to the absorptivity of the body depends upon the _____________ as per Kirchoff‟s law?


aWavelength of radiation

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bNature of the body

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cTemperature of the body

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dNone of these

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For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ?


aΔt

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bΔt2

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cΔt3

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d√(Δt)

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View Answer Δt

Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?


a50 -100 Kcal/hr.m2.°C

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b50 -100 W/m2.°K

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c50 -100 BTU/hr. ft.2°F

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d1000 – 1500 BTU/hr. ft.2°F

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Intermittent tube cleaning is possible to be done in case of a _____________ evaporator?


aBasket type

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bHorizontal tube

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cCalandria

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dNone of these

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View Answer Basket type

In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient______________?


aIncreases

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bDecreases

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cIs not affected

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dMay increase or decrease; depends on the feed

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View Answer Decreases

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