PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

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.

Molal flow rate of vapour

All of these

Pressure and temperature

Vapour molecular weight

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in the number of shell passes, the value of FT

Increases

Remains same, only if the number of tube passes does not change

Decreases

Remains same

TRUE ANSWER : ?
YOUR ANSWER : ?

Movement of pipeline caused by thermal expansion is taken care by providing

Changes in its direction

Expansion joint

Change in the shape of pipeline

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, σ = yield strength and E = modulus of elasticity)

E

E/σ

Σ/E

Σ

TRUE ANSWER : ?
YOUR ANSWER : ?

For a cylinderical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness?

Hemispherical

Ellipsoidal (2 : 1)

Flat plate

Conical

TRUE ANSWER : ?
YOUR ANSWER : ?

Weep holes provided in the plates of a distillation column

Facilitate draining out liquid from a tray when the unit is not in operation

All of these

Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid

Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation

TRUE ANSWER : ?
YOUR ANSWER : ?

A pressure vessel is said to be made of 'thick' shell, if the ratio of its diameter to wall thickness is

10

20

TRUE ANSWER : ?
YOUR ANSWER : ?

Reflux ratio variation in a distillation column is between

Minimum and infinity

Zero and one

Zero and infinity

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Longitundinal stress induced in a thin walled cylindrical storage vessel is

PD/4t

PD/6t

PD/2t

PD/3t

TRUE ANSWER : ?
YOUR ANSWER : ?

For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by

Di, opt = 3.9 Q0.45 . ρ0.23

Di, opt = 3 Q0.36 . ρ1.86 μ0.08

Di, opt = 7.6 Q0.36 . ρ0.9

Di, opt = 3 Q0.36 ρ0.18

TRUE ANSWER : ?
YOUR ANSWER : ?