PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

Friction factor for turbulent flow in a new pipe is given by

f = 0.04/NRe0.16

f = 0.22 NRe0.05

f = 16/NRe

f = 25/NRe

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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.

1/2

4

2

8

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Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Both B and C

Permits the use of less tubes in a given shell diameter

Permits the use of more tubes in a given shell diameter

Facilitates comparatively easier external cleaning because of large clearance

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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.

0.5 nth

nth

1.5 nth

(1/n)th

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Lug support is

Same as bracket support

The most suitable for thick vertical vessel

Provided usually for vessels of much smaller height than skirt supported vessels

All of these

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The ratio of shear stress to shear strain is called

Shear modulus

Modulus of rigidity

Bulk modulus

Modulus of elasticity

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In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be

D₂ - D₁ (D₁ and D₂ are I.D. of inner and outer pipes respectively)

Same as that for fluid flow

Less than that for fluid flow

More than that for fluid flow

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A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

Central dished section and corner torus section

Central dished section and straight flange section

Straight flange section and corner torus section

Corner torus section and central dished section

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In case of a 'thin' pressure vessel, the ratio of its diameter to wall thickness is

> 10

< 10

> 20

30

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Pick out the wrong statement about distillation operation

In flash (equilibrium) distillation, a definite fraction of liquid is vaporised in such a way that the evolved vapour & residual liquids are in equilibrium with each other

Distillation under vacuum is a substitute for steam distillation

In differential (simple) distillation, the vapour is removed as soon as it is formed without appreciable condensation

Flash distillation, differential distillation & steam distillation are all continuous distillation processes

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