Chemical Engineering MCQs

Page No. 474

Evaporator tubes are generally_____________________?


aHorizontal


bVertical


cInclined


dRandom


View Answer Vertical

In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is _____________ the outlet temperature of the cold fluid?


aEqual to


bMore than


cLess than


dEither more or less than (depending upon the fluid)


View Answer Equal to

Critical value of the _____________ number governs the transition from laminar to turbulent flow in free convection heat transfer?


aGrashoff


bReynolds


cBoth ‘a’ & ‘b’


dPrandtl & Grashoff


View Answer Prandtl & Grashoff

Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the_________________?


aExistence of thermal boundary layer


bTemperature gradient produced due to density difference


cBuoyancy of the bubbles produced at active nucleation site


dNone of these


View Answer None of these

Reason for operating an evaporator in multiple effects is to secure ___________________?


aIncreased steam economy


bDecreased steam consumption


cBoth A. and B.


dIncreased capacity


View Answer Both A. and B.

All analogy equations connecting friction factor and heat transfer co-efficient apply only to ___________________?


aWall or skin friction


bForm friction


cBoth A. and B.


dTurbulent flow


View Answer Wall or skin friction

Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface) ?


aU1 – U2


b1/U1 – 1/U2


c1/U2 – 1/U1


dU2 – U1


View Answer 1/U1 – 1/U2

For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is________________?


a1.26 h1


b0.794 h1


c0.574 h1


d1.741 h1


View Answer 0.794 h1

A graph between _____________ is called Wilson plot?


a(1/U) Vs. (1/v0.8)


b(1/v0.8) Vs. U


cv0.8 Vs . U


d(1/U) Vs. (1/V)


View Answer (1/U) Vs. (1/v0.8)

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?


a35.5


b43.75


c81.25


d48.25


View Answer 81.25

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