Chemical Engineering - Heat Transfer

46. 

Tube expansion allowances exist in __________ heat exchanger.

A. multipass fixed tube sheet
B. U-tube
C. single pass fixed tube sheet
D. none of these

Answer: Option B

Explanation:

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47. 

Pick out the wrong statement.

A. In drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2.
B. Sherwood number in mass transfer corresponds to Nusselt number in heat transfer and Schmidt number to Prandtl number.
C. Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger.
D. Hot gases at moderate pressure are usually in the shell side of shell and tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side.

Answer: Option C

Explanation:

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48. 

Agitated film evaporator is suitable for concentrating __________ liquids.

A. foaming
B. viscous
C. very thin
D. corrosive

Answer: Option B

Explanation:

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49. 

The thickness of condensate layer in filmwise condensation depends on the

A. condensation rate
B. surface configuration
C. liquid flow rate from the surface
D. all (a), (b) and (c)

Answer: Option D

Explanation:

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50. 

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.

A. parabolic
B. hyperbolic
C. linear
D. logarithmic

Answer: Option A

Explanation:

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