Chemical Engineering MCQs

Page No. 502

A perforated plate has holes of diameter dn arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by_______________?


a(ph – dh)/ph


b(ph – dh . dt/2)/ph


c(ph – dt)/ph


d(ph – dh)/dh


View Answer (ph – dt)/ph

The ratio of linear stress to linear strain is termed as the ____________________?


aModulus of elasticity


bModulus of rigidity


cBulk modulus


dNone of these


View Answer Modulus of elasticity

Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or ______________ times the column diameter, whichever is lower?


a2.5-3.0


b5-7.5


c10-12.5


d15-20


View Answer 2.5-3.0

Accidents in chemical plants are mostly due to___________________?


aInadequate equipment design


bFaulty operating procedures


cImproper layout of the equipments


dFailure of equipments



The equivalent diameter for fluid flow through a channel of constant non-circular cross section of area ‘A’ is given by (where, P = perimeter of the channel in contact with the fluid) ?


a4 A/P


bA/P


c4 P/A


d√A


View Answer 4 A/P

The buckling tendency of compression members is always in the direction of the _____________________?


aLeast radius of gyration


bAxis of the load


cPerpendicular to the axis of the load


dNone of these



____________ is the determining factor for the number of bubble caps to be used per tray?


aPermissible slot velocity


bTray diameter


cLiquid load


dVapor load



Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger ?


a75% cut segmental baffle


b25% cut segmental baffle


cOrifice baffle


dDisk and doughnut baffle



The clearance between two tubes in a shell and tube heat exchanger is known as ‘ligament’, whose minimum value is _____________ the outside diameter of the tube, but in no case it should be less than 4.5 mm?


aEqual to


bHalf


cOne fourth


dThree fourth


View Answer One fourth

A binary liquid Azeotropic mixture has boiling point lower than either of the components, when it shows _____________ deviation from Raoult’s Law?


aPositive


bNegative


cNo


dNone of these


View Answer Positive

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