A lubricant 100 times more viscous than water would have a viscosity (in Pa.s) ?

Related Mcqs:

1. Viscosity of water is about _____________ times that of air at room temperature?

   A. 15
   B. 55
   C. 155
   D. 1050

2. As per Newton’s law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to (where, μ = fluid viscosity) ?

   A. 1/μ
   B. μ
   C. μ2
   D. 1/μ2

3. A gas (density = 1.5 kg/m3, viscosity = 2 × 10‒5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5 kg/m3and viscosity of 3 × 10‒5kg/m.s flowing at 3 m/s will be________________?

   A. 8400 Pa/m
   B. 12600 Pa/m
   C. 18900 Pa/m
   D. 16800 Pa/m

4. A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump_________________?

   A. Develops a lower head
   B. Capacity is reduced
   C. Requires more power
   D. All A., B. and C.

5. The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s) ?

   A. 24000
   B. 24
   C. 0.24
   D. 0.44

6. The ratio of inertial forces to viscous forces is called the ______________ number?

   A. Weber
   B. Mach
   C. Froude
   D. Reynold

7. The terminal velocity of a small sphere settling in a viscous fluid varies as the___________________?

   A. First power of its diameter
   B. Inverse of the fluid viscosity
   C. Inverse square of the diameter
   D. Square of the difference in specific weights of solid & fluid

8. The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and___________________?

   A. Moving
   B. Static
   C. Cold
   D. Hot

9. A spherical particle is falling slow in a viscous liquid such that Reynolds number is less than 1. Which statement is correct for this situation ?

   A. Inertial and drag forces are important
   B. Drag, gravitational and buoyancy forces are important
   C. Drag force and gravitational forces are important
   D. None of the above

10. What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition ?

    A. 0.5
    B. 0.67
    C. 1
    D. 2