Chemical Engineering MCQs

Page No. 427

Pick out the wrong statement?


aThe capacity of an evaporator is reduced by the boiling point elevation

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bCorrosive liquid is normally passed through the tubes in a shell and tube heat exchanger

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cSteam jet ejector is used for vapor compression in a thermal recompression evaporator

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dHeat sensitive materials should be concentrated in high pressure evaporators

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A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides __________________?


aHigher economy

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bLower capacity

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cBoth A. & B.

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dLower economy

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View Answer Higher economy

For evaporation of viscous solution in a multiple effect evaporator, the preferred feeding scheme is _________________?


aForward

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bBackward

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cParallel

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dNone of these

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View Answer Backward

1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m2 and the overall heat transfer co-efficient to the liquid is 1500 W/m2.°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be__________________?


a15 min

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b22 min

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c44 min

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d51 min

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View Answer 51 min

Heat waves_____________________?


aCannot pass through vacuum

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bTravel in straight line

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cCan be reflected by a mirror

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dBoth B. and C.

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View Answer Both B. and C.

If air (a non-condensing gas) is present in a condensing vapor stream, it will ______________ the condensation rate of vapor?


aIncrease

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bDecrease

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cNot affect

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dIncrease the condensing film co-efficient as well as

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View Answer Decrease

For a perfectly transparent surface (like gases), the____________________?


aAbsorptivity = 0

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bTransmissivity = 1

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cReflectivity = 0

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dAll A., B. & C.

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View Answer Transmissivity = 1

A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ‘d’. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to_____________________?


ad0.8

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bd-0.2

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cd-1

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dd-1.8

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View Answer d-0.2

Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to_______________?


a4000

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b> 10000

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cNone of above

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d2000

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View Answer > 10000

The ratio of kinematic viscosity to thermal diffusivity is called the _______________ number?


aPeclet

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bPrandtl

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cStanton

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dNusselt

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View Answer Prandtl

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