Prandtl number is the ratio of________________?

Related Mcqs:

1. Prandtl and Reynold’s analogies are identical for Prandtl number value of__________________?

   A. 0
   B. 0.5
   C. 1
   D. 5

2. Prandtl and Reynolds analogy are same, when Prandtl number is____________________?

   A. 0.5
   B. 1
   C. > 2
   D. 1.5

3. Prandtl number is the ratio of________________?

   A. Momentum diffusivity to mass diffusivity
   B. Momentum diffusivity to thermal diffusivity
   C. Thermal diffusivity to mass diffusivity
   D. Thermal diffusivity to momentum diffusivity

4. Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?

   A. 0.2
   B. 0.4
   C. 0.6
   D. 0.8

5. For _______________ Prandtl number values, the heat conduction will be negligible in the buffer zone?

   A. Extremely low
   B. Low
   C. High
   D. No

6. Nusselt number is a function of Prandtl number and ______________ number of fluid in natural convection heat transfer?

   A. Grashoff
   B. Biot
   C. Stanton
   D. Reynolds

7. Prandtl number is the reciprocal of____________________?

   A. Thermal diffusivity/Momentum diffusivity
   B. Thermal diffusivity × Momentum
   C. Thermal diffusivity × Mass diffusivity
   D. Mass diffusivity × Momentum diffusivity

8. For what value of Prandtl number, the Col-burn analogy is valid ?

   A. 0.06 to 120
   B. 0.6 to 120
   C. 1 to 103
   D. 1 to 50

9. Value of Prandtl number for water ranges from_________________?

   A. 1 to 2
   B. 5 to 10
   C. 100 to 500
   D. 1000 to 2000

10. If Prandtl number is greater than the Schmidt number, then the____________________?

    A. Thermal boundary layer lies inside the concentration boundary layer
    B. Concentration boundary layer lies inside the thermal boundary layer
    C. Thermal & concentration boundary layers are of equal thickness
    D. Hydrodynamic (i.e., momentum) boundary layer is thicker than the other two