Chemical Engineering - Heat Transfer

41. 

The equivalent diameter for pressure drop is __________ that for heat transfer.

A. smaller than
B. greater than
C. equal to
D. not related with

Answer: Option A

Explanation:

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42. 

Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.

A. no
B. the least
C. the largest
D. lower

Answer: Option C

Explanation:

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43. 

The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K= 0.04 W/m.°K and thickness 0.16m is 10 W/m2. The temperature of the inside wall is - 5°C. The outside wall temperature is

A. 25°C
B. 30°C
C. 35°C
D. 40°C

Answer: Option C

Explanation:

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44. 

Thermal conductivity of a conducting solid material depends upon its

A. temperature
B. porosity
C. both (a) & (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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45. 

Pick out the wrong statement.

A. The controlling resistance in case of heating of air by condensing steam is in the air film.
B. The log mean temperature difference (LMTD) for counter flow and parallel flow can be theoretically same when any one of the fluids (hot or cold fluid) passes through the heat exchanger at constant temperature.
C. In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs.
D. Phase change in case of a pure fluid at a given pressure from liquid to vapor or vice-versa occurs at saturation temperature.

Answer: Option C

Explanation:

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