Chemical Engineering - Heat Transfer

6. 

'Duhring's plot' is of use in

A. extractive distillation
B. evaporation
C. leaching
D. absorption

Answer: Option B

Explanation:

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7. 

Which has the lowest Prandtl number ?

A. Liquid metal
B. Aqueous solution
C. Water
D. Lube oil

Answer: Option A

Explanation:

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8. 

Pick out the wrong statement.

A. The value of hydrostatic head increases with increase in vacuum in the effect in a multiple effect evaporator system.
B. Entering velocity of the liquid in the tubes of natural circulation evaporators is in the range of 0.3 to 0.9 metre/second.
C. Duhring's plot is used for calculating the concentration of solution.
D. In a multiple effect evaporation system, the number of effects is limited by the total boiling point rise.

Answer: Option C

Explanation:

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9. 

Prandtl number for most of dry gases is about

A. 0.001
B. 0.72
C. 70
D. 150

Answer: Option B

Explanation:

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10. 

Prandtl number is the reciprocal of

A. Thermal diffusivity/Momentum diffusivity
B. thermal diffusivity x Momentum
C. Thermal diffusivity x Mass diffusivity
D. Mass diffusivity x Momentum diffusivity

Answer: Option A

Explanation:

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