The viscosity of a gas_______________?

Related Mcqs:

1. If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is__________________?

   A. 0.25
   B. 0.50
   C. 1.0
   D. none of the above

2. The eddy viscosity for turbulent flow is______________?

   A. a function of temperature only
   B. a physical property of the fluid.
   C. dependent on the flow
   D. independent of the flow

3. If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is________________?

   A. less than 1
   B. between 1 and 100
   C. 160
   D. 200

4. A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be__________________?

   A. less than 1 m/sec
   B. 1 m/sec
   C. 1.5 m/sec
   D. 2 m/sec

5. The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is__________________?

   A. laminar flow
   B. transition flow
   C. turbulent flow
   D. not predictable from the given data

6. For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be_________________?

   A. 300
   B. 337.5
   C. 600
   D. 675

7. The unit of kinematic viscosity is_______________?

   A. gm/cm-sec2
   B. dyne-sec/cm2
   C. gm/cm2-sec
   D. cm2/sec

8. Newton’s law of viscosity relates________________?

   A. intensity of pressure and rate of angular deformation
   B. shear stress and rate of angular deformation
   C. shear stress, viscosity and temperature
   D. viscosity and rate of angular deformation

9. Stanton diagram is a______________?

   A. log-log plot of friction factor against Reynolds number
   B. log-log plot of relative roughness against Reynolds number
   C. semi-log plot of friction factor against Reynolds number
   D. semi-log plot of friction factor against relative roughness

10. The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?

    A. 0.423 D
    B. 0.577 D
    C. 0.223 D
    D. 0.707 D

    where D is the depth of flow