Chemical Engineering MCQs

Page No. 476

In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement ?


aResults in higher shell side pressure drop


bCan accomodate less number of tubes for a given shell diameter


cFacilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid


dCreates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient



_____________ heat exchanger is also known as ‘hair pin type’ exchanger?


aDouble pipe


bFinned


cPlate type


dRegenerative


View Answer Double pipe

The average velocity in the tubes of a 1-4 heat exchanger is ______________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate ?


a2


b1/2


c4


d1/4


View Answer 4

A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is________________?


aBending


bDeformation


cShear


dElongation


View Answer Bending

(Le/D) for couplings and unions would be_______________?


a60


b200


c350


dNegligible


View Answer Negligible

Ratio of tube length to shell diameter for a shell and tube heat exchanger is________________?


a8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers


b4 : 1 to 8 : 1 for liquid-liquid exchanger


c< 4 : 1 for gas-gas exchangers


dBoth B. & C.


View Answer Both B. & C.

Liquid gradient over a tray can be minimised by________________?


aProviding a higher skirt clearance or a higher weir


bDecreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must flow


cUsing split flow, radial flow or cascade flow for column diameter large than 4 ft


dAll A., B. and C.


View Answer All A., B. and C.

Slope of counter-current flow rotary drier is in the range of ____________ meter/metre?


a0 to 0.08


b0 to 0.8


c0 to 1.5


d0 to 2.2


View Answer 0 to 0.08

In a multiple effect evaporator system having ‘n’ effects, the amount of water evaporated per unit surface area in approximately equal to _____________ times that in a single effect?


anth


b(1/n)th


c0.5 nth


d1.5 nth


View Answer (1/n)th

Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally ____________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8″)?


aHalf


bThree fourth


cEqual to


d1.5 times


View Answer Equal to

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