Chemical Engineering MCQs

Page No. 488

In actual operation of a bubble cap distillation tower, the ______________ at the bottom of the tower is more than that at the top of the tower?


aMolal flow rate of vapour


bVapour molecular weight


cPressure and temperature


dAll A., B. and C.


View Answer All A., B. and C.

In a ______________ riveted joint, the rivets in the various rows are opposite to each other?


aZig-zag


bChain


cDiamond


dNone of these


View Answer Chain

Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 – 1.4 cp and relative volatility < 4) (where ε = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi) ?


aη = 17 – 61.1 log μ


bη = 24.6 (Δp/μ)


cη = 1.66 – 0.25 log μ


dη = 0.25 log μ – 1.67



It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than _________________?


a0.99


b0.95


c0.80


d0.55


View Answer 0.80

The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about _________________ mm of water column per metre height of packing?


a1-5


b20-40


c100-150


d1000-1500


View Answer 20-40

Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as_________________?


aΔp = G


bΔp = G0.5


cΔp = G2


dΔp = 1/G0.6


View Answer Δp = G2

Fresh water carrying pipelines in chemical industries are coloured with _______________ color?


aSea green


bBrown


cYellow


dRed


View Answer Sea green

Holes of a sieve tray are arranged in triangular pitch of _________________ times the hole diameter?


a1.5 to 2


b2.5 to 5


c5 to 10


d10 to 15


View Answer 2.5 to 5

Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about __________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate ?


a2


b½


c4


d8


View Answer 8

In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon______________________?


aBaffle spacing


bClearance


cPitch


dNone of these


View Answer None of these

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