The purpose of floating head in a heat exchanger is to

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 concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires

A

Less heating surface

B

More space

C

Lower maintenance cost

D

None of these

In a heat exchanger, floating head is provided to

A

Facilitate cleaning of the exchanger

B

Increase the heat transfer area

C

Relieve stresses caused by thermal expansion

D

Increase log mean temperature gradient

In a shell and tube heat exchanger, floating head is used for

A

Large temperature differentials

B

High heat transfer co-efficient

C

Low pressure drop

D

Less corrosion of tubes

In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used

A

In low range of temperature differences

B

In high range of temperature differences

C

Because of its low cost

D

To prevent corrosion of the tube bundles

LMTD in case of counter flow heat exchanger as compared to parallel flow heat exchanger is

A

Higher

B

Lower

C

Same

D

Depends on the area of heat exchanger

If all the conditions and dimensions are same, then the ratio of velocity through the tubes of a double pass heat exchanger to that through the single pass heat exchanger is

A

1

B

2

C

$$\frac{1}{2}$$

D

4

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

A

Once

B

Twice

C

Thrice

D

Four times

In counter current flow heat exchanger, the logarithmic temperature difference between the fluids is ________ as compared to parallel flow heat exchanger.

A

Same

B

Less

C

Greater

D

None of these

LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is

A

0

B

1

C

>1

The purpose of floating head in a heat exchanger is to

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