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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 10
1.
A __________ evaporator employs an annular downtake.
basket type
horizontal
long tube vertical
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.
1
7
18
26
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
In natural convection heat transfer, the correlating parameter is the
Graetz number
Eckert number
Grashoff number
Bond number
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
Boiling of milk in an open vessel is an example of __________ boiling.
film
sub-cooled
saturated nucleate
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
Pick out the wrong statement.
In process heat exchangers, saturated steam is preferred over the superheated steam.
The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength of λ1. If the surface temperature is halved, the maximum in the emissive power would occur at a wavelength of 0.5 λ1.
When a vertical plate is heated in infinite air environmental under natural convection conditions, the velocity profile in air, normal to the plate, exhibits a maximum.
A body at 925 K emits an energy of 1.42 x 1011σW/m2 (σ is the Stefan-Boltzman constant) in the wavelength band between 3 μm to 4 μm. The fraction of this energy in the total energy emitted over the entire wavelength range is equal to emissivity.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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