Heat Transfer - Section 1 (3)

Directions to Solve

Heat Transfer - Section 1

In this section of Heat Transfer, you will find the MCQs related to this field
and can submit your answers easily.

17.

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

A.	increase the cross-section of the shell side liquid.
B.	force the liquid to flow parallel to the bank.
C.	increase the shell side heat transfer co-efficient.
D.	decrease the shell side heat transfer co-efficient.

Answer: Option C

Explanation:

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18.

In case of evaporators, liquid entrainment results primarily due to

A.	high vacuum in the evaporator.
B.	high evaporation rate.
C.	foaming of the solution.
D.	high heat transfer rate.

Answer: Option C

Explanation:

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19.

With the increase of temperature, the Col-burn jH factor

A.	increases.
B.	decreases.
C.	remains unchanged.
D.	may increase or decrease ; depending on temperature.

Answer: Option A

Explanation:

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20.

Kirchoff s law applies to __________ radiation.

A.	total
B.	monochromatic
C.	both (a) & (b)
D.	neither (a) nor (b)

Answer: Option C

Explanation:

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21.

Presence of a non-condensing gas in a condensing vapour

A.	increases the rate of condensation.
B.	decreases thermal resistance.
C.	is desirable to increase the film co-efficient.
D.	none of these.

Answer: Option D

Explanation:

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22.

Which of the following is not used as a medium for high temperature heating ?

A.	Dowtherm
B.	mercury
C.	liquid metal (e.g. molten sodium)
D.	fused salts (e.g., an eutectic mixture of 53% KNO3, 40% NaNO2and 7% NaNO3)

Answer: Option B

Explanation:

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23.

The actual temperature drop across the heating surface in an evaporator depends on the

A.	feed.
B.	depth of liquid over heating surface.
C.	pressure difference between steam chest and vapour space.
D.	all (a), (b) and (c).

Answer: Option D

Explanation:

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24.

Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

A.	laminar
B.	transition
C.	both 'a' & 'b'
D.	highly turbulent

Answer: Option D

Explanation:

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