Steam is routed through the tube in case of a __________ evaporator.

Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the

A

Less corrosion problems

B

Flexibility possible in the baffle arrangement

C

Low pressure drop

D

High heat transfer co-efficient

High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

A

Tubes to avoid the expansion of high pressure shell construction

B

Shell side for smaller total pressure drop

C

Shell side, if the flow is counter-current and tube side if the flow is co-current

D

Shell side for large overall heat transfer co-efficient

In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.

A

Increases

B

Decreases

C

Remains constant

D

May increase or decrease, depends on the vacuum

A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

A

Is economical in operation

B

Employs high velocity, high heat transfer rate and less heating surface requirement

C

Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

D

Both B & C

Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

A

Finned tube heat exchanger with air inside and steam outside

B

Finned tube heat exchanger with air outside and steam inside

C

Shell and tube heat exchanger with air inside tubes and steam on shell side

D

Shell and tube heat exchanger with air on shell side and steam inside tubes

A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because

A

Total heat transfer area of all the effects is -less than that in a single effect evaporator system

B

Total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect

C

Boiling point elevation in a single effect system is much higher than that in any effect in a multieffect system

D

Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system

In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.

A

Less than

B

1.25-1.50 times

C

2.5 times

D

One-fourth of

Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.

A

1.25

B

1.75

C

2.5

D

3.5

The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

A

Long tube

B

Short tube

C

Vacuum

D

Falling film

They fell --- retreating army and routed them

A

down

B

off

C

on

D

out

Steam is routed through the tube in case of a __________ evaporator.

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