Prandtl number is given by__________________?

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. Thermal diffusivity is given by__________________?

   A. k/ρCp
   B. ρCp/k
   C. μCp/a
   D. μ/hCp

4. Graetz number is given by__________________?

   A. mCp/kL
   B. kL/mCp
   C. mCp/kμ
   D. kμ/mCp

5. The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________________?

   A. q = [2π k (Ti + T0)/2]/ln (ri/r0)
   B. q = 2π ri k (Ti – T0)/(r0/ri)
   C. q = 2π k (Ti – T0)/(r0/ri)
   D. q = 2π k (Ti – T0)/[(r0 + ri)/2]

6. 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

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

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

8. Colburn analogy is applicable for the value of Prandtl number from_________________?

   A. 0.001 to 1
   B. 0.6 to 120
   C. 0.5 to 5
   D. 120 to 400

9. Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is________________?

   A. 0.1
   B. > 1
   C. < 1
   D. 1

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