Which has the lowest Prandtl number ?

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. Which of the following has the lowest Prandtl number ?

   A. Molten sodium (a coolant used in fast breeder reactor)
   B. Water
   C. Transformer oil
   D. Dilute H2SO4

4. For what value of Prandtl number, St = f/2 ?

   A. 1.5
   B. 1
   C. > 1
   D. < 1

5. 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

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. 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. Prandtl number is the ratio of________________?

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