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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 5
11.
In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.
nucleate
pool
low pressure
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.
10
>10
<10
either (b) or (c), depends on the mass of the body
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
In forced convection, the Nusselt number is a function of
Re and Pr
Re and Gr
Pr and Gr
Re and Sc
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical ?
0.5
1
1.5
80
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because
total heat transfer area of all the effects is -less than that in a single effect evaporator system.
total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect.
boiling point elevation in a single effect system is much higher than that in any effect in a multieffect system.
heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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