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

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. Which has the lowest Prandtl number ?

   A. Liquid metal
   B. Aqueous solution
   C. Water
   D. Lube oil

7. Prandtl number for most of dry gases is about________________?

   A. 0.001
   B. 0.72
   C. 70
   D. 150

8. 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

9. 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

10. Value of Prandtl number for water ranges from_________________?

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