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

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b(ph – dh . dt/2)/ph

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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

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cBulk modulus

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dNone of these

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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

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c10-12.5

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d15-20

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View Answer 2.5-3.0

Accidents in chemical plants are mostly due to___________________?


aInadequate equipment design

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bFaulty operating procedures

✓


cImproper layout of the equipments

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dFailure of equipments

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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

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c4 P/A

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d√A

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View Answer 4 A/P

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


aLeast radius of gyration

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bAxis of the load

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cPerpendicular to the axis of the load

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dNone of these

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


aPermissible slot velocity

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bTray diameter

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cLiquid load

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dVapor load

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


a75% cut segmental baffle

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b25% cut segmental baffle

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cOrifice baffle

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dDisk and doughnut baffle

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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

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bHalf

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cOne fourth

✓


dThree fourth

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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

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cNo

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dNone of these

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View Answer Positive

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