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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 6
21.
A sphere of radius 'R1' is enclosed in a sphere of radius 'R2'. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is
0
R2/(R1+R2)
1
(R1/R2)2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
For a laminar flow of fluid in a circular tube, 'h1' is the convective heat transfer co-efficient at velocity 'V1'. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is
1.26 h1
0.794 h1
0.574 h1
1.741 h1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
The main purpose of providing fins on heat transfer surface is to increase the
temperature gradient.
mechanical strength of the equipment.
heat transfer area.
heat transfer co-efficient.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
A BTU/hr.ft.2 °F is equal to
1 kcal/hr. m2°C.
4.88 kcal/hr. m.2°C.
1 kcal/hr. m2.°K.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Which of the following has the lowest Prandtl number ?
Molten sodium (a coolant used in fast breeder reactor)
Water
Transformer oil
Dilute H2SO4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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