Chemical Engineering MCQs

Page No. 448

Heat exchangers operating, when the asymptotic range is reached, ?


aProvide very large heat transfer co-efficient

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bResults in making part of the heating surface inactive

✓


cResults in abruptly increased velocity

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dNone of these

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In counter flow compared to parallel flow, ?


aLMTD is greater

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bLess surface area is required for a given heat transfer rate

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cBoth A. and B.

✓


dMore surface area is required for a given heat transfer rate

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View Answer Both A. and B.

Mode of heat transfer involved in the cooling of air cooled internal combustion engine is_________________?


aConduction

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bNatural convection

✓


cForced convection

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dNone of these

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View Answer Natural convection

In a single effect evaporator, the economy is________________?


a1

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b< 1

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c> 1

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dNone of these

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View Answer < 1

Small scale evaporation is done in a_________________?


aHeat exchanger

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bCondenser

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cMultiple effect evaporator

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dSteam jacketed kettle

✓


View Answer Steam jacketed kettle

In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always__________________?


a< 1

✓


b> 1

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c1

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d∞

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View Answer < 1

Low thermal conductivity of heat insulating materials is due to its_________________?


aDense structure

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bHigh proportion of air space

✓


cHigh specific heat

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dNone of these

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In case of a vertical tube evaporator, with increase in the liquor level, the___________________?


aCapacity of the evaporator is decreased

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bCapacity of the evaporator is increased

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cTrue temperature drop increases

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dBoth B. and C.

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The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the___________________?


aHeating volume

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bHeat transfer area

✓


cNusselt number

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dNone of these

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View Answer Heat transfer area

Thermal diffusivity is given by__________________?


ak/ρCp

✓


bρCp/k

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cμCp/a

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dμ/hCp

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View Answer k/ρCp

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