Chemical Engineering Site

Test Your knowledge on Packed Columns and Packings – Online Quiz

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8 years ago

Packed columns are an integral part of any Chemical Processing Industry. Packed column’s, Trays and Packings find a wide range of applications like Absorption, Distillation, Stripping, Gas Cooling etc. The selection of the type, material of construction of packing affects the affects the heat and mass transfer inside the column.

How well do you know the ABC’s of Packed Columns? It’s time to take our resourceful online Quiz module to find out!

1.

In the above picture containing Types of Packings, Which one of the following is True

a) Ceramic Raschig Rings, b) SS Pall Rings, c) Ceramic Saddles, d) Cascade Mini Rings

a) SS Raschig Rings, b) Ceramic Pall Rings, c) Cascade Mini Rings d) SS Saddles

a) Ceramic Saddles, b) Cascade Mini Rings, c) Ceramic Raschig Rings, d) SS Pall Rings

a) Ceramic Raschig Rings, b) Cascade Mini Rings, c) Ceramic Saddles, d) SS Pall Rings

None

2.

Channelling is most severe

in towers packed with stacked packing

in towers packed randomly with crushed solids

in dumped packing of regular units

at very high liquid flow rate

None

3.

Flooding results in

High tray efficiency

Low tray efficiency

High gas velocity

good contact between the fluids

None

4.

Flooding in a column results due to

High pressure drop

Low pressure drop

Low velocity of the liquid

high temperature

None

5.

In case of an absorber, the operating line

lies above the equilibrium curve

lies below the equilibrium curve

None

6.

Rasching ring made of procelain cannot be used for treating concentrated

Hydrochloric acid

Nitric acid

Alkalis

Sulphuric acid

None

7.

Very tall packed towers are divided into series of beds to

Reduce the overall pressure drop

avoid channelling

Reduce liquid hold-up

avoid flooding

None

8.

which of the following provides maximum contact surface for a liquid-vapour system?

Packed tower

Bubble-cap plate column

Seive-plate column

Wetted wall column

None

9.

Channelling in a packed tower results from the

High pressure drop

maldistribution of liquid

non-uniformity of packing

Both (a) and (b)

None

10.

Under conditions of flooding in packed tower, the gas pressure drop

decreases rapidly

increases rapidly

remains constant

is maximum

None

11.

With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

increases

decreases

remains same

may increase or decrease; depends on individual design

None

12.

Which of these columns incurs the lowest pressure drop ?

Packed column ( with stacked packing)

packed column (with dumped packing)

bubble plate column

Pulse column

None

13.

Diameter to height ratio for a Raschig ring is

1

0.5

2

8

None

14.

Small diameter distillation column can be a

Packed column

Sieve Tray

Bubble cap

Any of these

None

15.

In an absorption column, the flooding velocity for random packing is ........... that for stacked/regular packing

greater than

less than

equal to

either (a) or (b); depends on the packing height

None

16.

For absorbing a sparingly soluble gas in a liquid

gas side mass transfer co-efficient should be increased

liquid side mass transfer co-efficient should be increased

liquid side mass transfer co-efficient should be decreased

mass transfer co-efficient must be kept constant

None

17.

Stacked packing compared to random packing

Provides poorer contact between the fluids

Gives lower pressure drop

both (a) and (b)

Gives higher pressure drop

None

18.

The Inventor of Raschig rings was

Octave Levenspiel

Trevor Kletz

Fritz Haber

Friedrich Raschig

None

19.

If the turndown ratio requirement of the process is High, the suitable Tray type is

Bubble Cap Tray

Sieve Tray

Valve Tray

All of the above

None

20.

The cheaper tray type is

Bubble Cap Tray

Sieve Tray

Valve Tray

All of the above

None

21.

The Liquid Redistributor requirement is low in which of the following packing type?

Raschig rings

Ceramic Saddles

None

22.

The best method to install the Ceramic Saddles inside the tower is

Fill the tower with water and the fall should be gentle

Charge them from top manhole so that it falls freely

None

23.

In the following picture containing Types of Trays, Which one is True

a) Valve Tray, b) Sieve Tray, c) Bubble Cap Tray

a) Sieve Tray, b) , Valve Tray, c) Bubble Cap Tray

a) Bubble Cap Tray, b) , Valve Tray, c) Sieve Tray

a) Bubble Cap Tray, b) , Sieve Tray, c) Valve Tray

None

24.

Pulsing in a Distillation Column occurs when

The Vapor Rate inside the Column is High

The Vapor Rate inside the Column is Low

The Liquid Rate inside the Column is High

The Liquid Rate inside the Column is Low

None

25.

Blowing occurs inside the Distillation Column when

The Vapor Rate inside the Column is High

The Vapor Rate inside the Column is Low

The Liquid Rate inside the Column is High

The Liquid Rate inside the Column is Low

None

26.

Which one is suitable for handling Foaming systems?

Packed Column

Plate Column

None

27.

For Cooling the Hot CO2 gas using Water which one of the following is preferred?

Packed Column with Ceramic Saddles

Tray Column with Bubble Cap

Tray Column with Valves

Packed Column with Raschig Rings

None

28.

In the case of 'Weep Point' (Velocity), which one is False?

Increases as the percentage free area increases

Increases as the liquid surface tension increases

Decreases as the hole size decreases

Increases as the plate thickness decreases

None

29.

HETP =

Height of packing ÷ Number of theoretical plates

Number of theoretical plates ÷ Height of Packing

None

30.

High Purity/ Recovery can be achieved by

Increasing the Reflux Ratio

Increasing the Equilibrium Stages

Both (a) and (b)

Decreasing the Equilibrium Stages

None

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