Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type

In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is

A

Minimum

B

Maximum

C

Zero

D

Infinity

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

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

A

Equal to

B

More than

C

Less than

D

Either more or less than (depending upon the fluid)

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

Choose the sentence (s) in which the word 'straight means 'honest or frank'. (1) Draw a straight line through the two points. (2) You are not being straight with me, even though you know that I like straight answers. (3) It was a straight choice between taking or leaving the offer of friendship.

A

(1)

B

(3)

C

(1) and (2)

D

1) and (3)

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

When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by

A

Conduction

B

Convection

C

Radiation

D

Conduction and convection

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

A

Varies directly as the area and the LMTD

B

Directly proportional to LMTD and inversely proportional to the area

C

Varies as square of the area

D

None of these

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

Terminal point temperature differences between fluids in case of a heat exchanger is termed as

A

Approach

B

Log mean temperature difference

C

Arithmetic mean temperature difference

D

Geometric mean temperature difference

Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type

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