In free convection heat transfer transition from laminar to turbulent flow is go

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Question
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the
Options
A. Reynold's number
B. Grashoff's number
C. Reynold's number, Grashoff's number
D. Prandtl number, Grashoff's number

Correct Answer

Prandtl number, Grashoff's number

Heat Transfer, Refrigeration and Air Conditioning problems

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3. According to Dalton's law of partial pressures, (where p_b = Barometric pressure, p_a = Partial pressure of dry air, and p_v = Partial pressure of water vapour)
Options
A. P_b = p_a - p_v
B. P_b = p_a + p_v
C. P_b = p_a x p_v
D. P_b = p_a/p_v

4. The total radiation from a black body per second per unit area is __________ fourth power of the absolute temperature. This statement is known as Stefan-Boltzmann law.
Options
A. equal to
B. directly proportional to
C. inversely proportional to

5. In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively
Options
A. water and water
B. water and lithium bromide
C. ammonia and lithium bromide
D. ammonia and water

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