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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 3
21.
The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is
(Stefan-Boltzman constant = 5.67xl0-8 W/m2.K4)
1000
727
800
1200
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Crystallisation of solids from a homogeneous solution is a/an __________ process.
exothermic
mildly endothermic
highly endothermic
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is
6000
24000
60000
48000
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
Value of Prandtl number for water ranges from
l to 2
5 to 10
100 to 500
1000 to 2000
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by
eddies current
conduction
convection
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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