Chemical Engineering MCQs

Page No. 447

Which of the following is not used as a medium for high temperature heating ?


aDowtherm

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bMercury

✓


cLiquid metal (e.g. molten sodium)

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dFused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3)

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View Answer Mercury

The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by ______________ times, when the number of tube passes is increased to 8?


a20.8

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b40.8

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c40.4

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d20.4

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View Answer 40.8

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred_________________?


aThrough a metallic wall

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bBy direct contact of hot flue gas with air

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cBy heating an intermediate material (like chequor bricks) and then heating the air from this hot material

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dNone of these

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A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is__________________?


a6000

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b24000

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c60000

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d48000

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View Answer 24000

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is______________?


a1.66

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b88.66

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c3.66

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dDependent on NRe only

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View Answer 3.66

Which characteristic of a fluid is not important in deciding its route in a shell and tube heat exchanger ?


aCorrosiveness

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bFouling characteristic

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cViscosity

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dNone of these

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View Answer None of these

What is the absorptivity of a black body?


a1

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b0

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c0.78

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d0.95

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View Answer 1

Economy of a multiple effect evaporator is not influenced much by the_______________________?


aBoiling point elevations

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bTemperature of the feed

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cRate of heat transfer

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dRatio of the weight of the thin liquor to thick liquor

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Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube___________________?


aExit-fluid temperature > wall temperature

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bExit fluid temperature < wall temperature

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cExit fluid temperature = wall temperature

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dGraetz number > 100

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In case of evaporators, liquid entrainment results primarily due to_________________?


aHigh vacuum in the evaporator

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bHigh evaporation rate

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cFoaming of the solution

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dHigh heat transfer rate

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