PROCESS EQUIPMENT AND PLANT DESIGN QUIZ

Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer).

250

750

450

650

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following types of reactors is the safest from operation point of view?

A liquid phase catalytic reactor

Pot type reactor

A vapor phase reactor

A liquid phase reactor

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YOUR ANSWER : ?

The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles?

To provide support to the tube bundle

To reduce the induced vibration in the tubes

To increase the residence time of shell side fluid

To increase the tube side heat transfer co-efficient by inducing turbulence

TRUE ANSWER : ?
YOUR ANSWER : ?

In case of a continuous distillation column, increase in reflux ratio may result in the

Greater cost for the condenser coolant

Lower fixed charges for the column

Greater cost for the reboiler heat supply

All of these

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YOUR ANSWER : ?

Cooling water fouling factors vary in the range of 0.001 to 0.003

(BTU/hr.ft² . °F)⁻¹

(kcal/hr.m² .°C)⁻¹

(W/m².°K)⁻¹

(kcal/hr. m. °C)⁻¹

TRUE ANSWER : ?
YOUR ANSWER : ?

A cylindrical storage tank can have a self supported conical roof,

Irrespective of its diameter

If its diameter is less than 15-20metres

If its diameter is more than 50 meters

If the thickness of the roof is more than that of the cylindrical shell

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YOUR ANSWER : ?

What is the slope of the operating line in the stripping section of a distillation column?

?

> 1

< 1

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YOUR ANSWER : ?

In packed absorption tower, onset of flooding usually occurs at a pressure drop of about __________ mm of water column per metre height of packing.

200-250

50-75

25-50

750-1000

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of down take area to cross-sectional area of the tube, for calendria type evaporator ranges from

2 to 2.5

1.5 to 2

1 to 1.5

0.5 to 1

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YOUR ANSWER : ?

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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YOUR ANSWER : ?