Test Your knowledge on Heat Exchangers – Online Quiz

Heat Exchangers are the most common equipment used for Heat transfer application. They are used to heat or cool the streams based on the process requirement. We are familiar with the article Heat Exchanger Applications in Chemical Industry. Now it’s time to test out knowledge on Heat Exchangers through this online test. This Heat Exchangers Quiz module covers Basics, Selection, Application and Calculations with respect to Heat Exchangers.

The purpose of providing expansion bellows in the shell of tubular exchanger is to

Increase the heating load

Impart structural strength

Account for the unevenvexpansion of shell and tube bundless

Facilitate increase of shell length, if needed

Baffles in the shell side of a shell and tube heat exchanger

increase the cross-section of the shell side liquid

Force the liquid to flow parallel to the bank

Increase the shell side heat transfer co-efficient

Decrease the shell side heat transfer co-efficient

Purpose of Ferrules (Short sleeves inserted into the inlet end of the tube) is

To Increase Heat Transfer

To Provide Support for Tubes

To Prevent Erosion of Tube ends due to Turbulence

All of the Above

Seal Strips are used

To Prevent Corrosion of the Shell

To prevent Shell side fluid bypassing through Tube bundle and Inner Wall of the Shell

To reduce the Impingement of the fluid

None of these

Finned tube heat exchangers

Give larger area per tube

Use metal fins of low thermal conductivity

Facilitate very large temperature drop through tube wall

Are used for smaller heat load

Multipass heat exchangers are used

Because of simplicity of fabrication

For low heat load

to obtain higher heat transfer co-efficient and shorter tube

To reduce the pressure drop

Ammonia Chillers used in High Pressure Synthesis Loop comes under TEMA type of........

AES

DKU

BEM

None of the above

Double pipe heat exchangers are used

When heat transfer area required in very high

When heat transfer area required is very low (Less than 100 Sq.Ft)

Because it occupies less floor area

Because it is less costly

In a shell and tube heat exchanger, square pitch compared to triangular pitch

Gives a higher shell side pressure drop

Gives a lower shell side pressure drop

Can pack more surface area into a shell of given diameter

None of these

10.

Baffle spacing

Is the centerline-to-centerline distance between adjacent baffles

Minimum Spacing: one fifth of the diameter of the shell

Maximum Spacing: Equal to Shell Inside Diameter

All of the Above

11.

In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid

Varies directly as the area and the LMTD

Directly proportional to LMTD and in-versely proportional to the area

Varies as square of the area

None of these

12.

In counter flow compared to parallel flow,

LMTD is greater

Less surface area is required for a given heat transfer rate

Both (a) & (b)

More surface area is required for a given heat transfer rate

13.

In a shell and tube heat exchanger

The temperature drops in the two fluids and the wall are proportional to individual resistances

The temperature drops in inversely proportional to the resistance across which the drop occurs

There is no relationship between temperature drop and resistance

The relationship is not generalised

14.

LMTD is counterflow and parellel flow heat exchanger will be the same, when the

Cold fluid is heated to a certain temperature by condensing steam

Outlet temperature of both the hot and cold fluid are same

Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid

None of these

15.

A 2-4 heat exchanger involves

Only counter-flow of fluids

Only parellel-flow of fluids

Both counter and parellel-flow of fluids

Smaller pressure drop compared to 1-2 exchanger

16.

Floating Head Exchanger......

Allows expansion of Tube bundle

Used when both Shell and Tube fluids are dirty

Costliest than other Exchanger Types

All of the Above

17.

In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

Infinity

Zero

Same as average heat transfer co-efficient for tube side

None of these

18.

Which is the best tube layout pattern (in a shell and tube heat exchanger) if the fluids are clean and non-fouling?

Square pitch

Triangular pitch

Diagonal square pitch

None of these

19.

In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

< 1

> 1

None of these

20.

Fouling factor

Is a dimensionless quantity

Does not provide a safety factor for design

Accounts for additional resistances to heat flow

None of these

21.

.......... heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side.

Single pass, fixed tube sheet

U-tube

Three pass, fixed tube sheet

None of these

22.

In a shell and tube heat exchanger, putting a longitudinal baffle across the shell side fluid to pass ....... through the heat exchanger

Once

Twice

Thrice

Four times

23.

In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is ............. the outlet temperature of the cold fluid

Equal to

More than

Less than

Either more or less than (depending upon the fluid)

24.

In case of multipass shell and tube heat exchanger, providing a baffle on the shell side ........ the heat transfer rate

Increases

Decreases

Does not affect

May increase or decrease, depends on the type of baffle

25.

Tube expansion allowances exist in ...... heat exchanger

Multipass fixed tube sheet

U-tube

Single pass fixed tube sheet

None of these

26.

In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will

increase

Decrease

Remains Unchanged

Either increase or decrease ; depends on the coolant flow rate

27.

In a shell and tube heat exchanger , the shell side fluid velocity can not be changed by changing the

Tube layout

Tube diameter

Tube pitch

No of baffles

28.

In a Shell and Tube Heat Exchanger, High Pressure Fluid is allocated in

Shell Side

Tube Side

29.

The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50 Deg C in industrial practice mainly to avoid

Its evaporation loss

Excessive corrosion

Uneconomic LMTD

Decrease in heat exchanger efficiency

30.

....... heat exchanger is used for chilling oil to be dewaxed

U-tube

Double pipe

Fixed tube

Floating head

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