A. 1
B. < 1
C. > 1
D. > 5
Related Mcqs:
- At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?
A. 1
B. 1
D. None of these - A composite flat wall of a furnace is made of two materials ‘A’ and ‘B’. The thermal conductivity of ‘A’ is twice of that of material ‘B’, while the thickness of layer of ‘A’ is half that of B. If the temperature at the two sides of the wall are 400 and 1200°K, then the temperature drop (in °K) across the layer of material ‘A’ is________________?
A. 125
B. 133
C. 150
D. 160 - Prandtl and Reynold’s analogies are identical for Prandtl number value of__________________?
A. 0
B. 0.5
C. 1
D. 5 - Prandtl and Reynolds analogy are same, when Prandtl number is____________________?
A. 0.5
B. 1
C. > 2
D. 1.5 - The thermal boundary layer at NPr > 1 ?
A. Is thicker than hydrodynamic boundary layer
B. Is thinner than hydrodynamic boundary layer
C. And the hydrodynamic boundary layers are identical
D. Disappears - A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is ______________ °C?
A. 6
B. 12
C. 18
D. 24 - The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is_________________?
A. Nusselt number
B. Sherwood number
C. Schmidt number
D. Stanton number - For what value of Prandtl number, St = f/2 ?
A. 1.5
B. 1
C. > 1
D. < 1 - At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ?
A. 0.5
B. < 0.5
C. > 0.6
D. < 0.1 - Value of Prandtl number for water ranges from_________________?
A. 1 to 2
B. 5 to 10
C. 100 to 500
D. 1000 to 2000
