PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference

May be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current

Is always more than arithmetic mean value and the geometric mean value

Is always less than arithmetic average value

Is always less than arithmetic mean value, but more than geometric mean value

TRUE ANSWER : ?
YOUR ANSWER : ?

With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT

Decreases very rapidly

Increases linearly

Remains constant

Increases very rapidly

TRUE ANSWER : ?
YOUR ANSWER : ?

In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.

1/10-1/15th

1/20-1/30th

1/2 to 1/4th

1/5-1/10th

TRUE ANSWER : ?
YOUR ANSWER : ?

Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around

5 and 10

300 and 500

180 and 300

45 and 75

TRUE ANSWER : ?
YOUR ANSWER : ?

Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have __________ roofs.

Fixed

Flat

Conical

Floating

TRUE ANSWER : ?
YOUR ANSWER : ?

Accidents in chemical plants are mostly due to

Improper layout of the equipments

Inadequate equipment design

Faulty operating procedures

Failure of equipments

TRUE ANSWER : ?
YOUR ANSWER : ?

Bubble cap plate column is

Used only for distillation, not for absorption

A differential stage contactor

A finite stage contactor

A continuous contactor

TRUE ANSWER : ?
YOUR ANSWER : ?

Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.

0 to 0.8

0 to 1.5

0 to 0.08

0 to 2.2

TRUE ANSWER : ?
YOUR ANSWER : ?

Pick out the wrong statement about distillation operation

Distillation under vacuum is a substitute for steam distillation

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

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

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

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always

< 1

Equal to the order of reaction

>1

1

TRUE ANSWER : ?
YOUR ANSWER : ?

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