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Fluid-mechanics Questions Set 10:

Quiz Mode

Shear stress in the Newtonian fluid is proportional to

Pressure

Strain

Strain rate

The inverse of the viscosity

Solution:

What force is necessary for an object to float?

Centrifugal force

Centripetal force

Buoyant force

Newton's force

Solution:

Which of the following forces does not act in the downstream direction of the fluid flow?

Pressure

Weight

Gravity

Friction

Solution:

What is the formula for elastic force?

Elastic stress/area

Elastic strain/area

Elastic stress*area

Elastic stress * Elastic strain

Solution:

The depth of flow for maximum velocity in a circular channel section with diameter equal to 1.5 m is:

0.75 m

1.065 m

1.215 m

1.425 m

Solution:

What is the specific volume of a material with a specific gravity of 0.6?

6.69×10⁻⁴ m³/N

1.69×10⁻⁴ m³/N

1.69×10⁻⁷ m³/N

1.89×10⁻⁸ m³/N

Solution:

On which of the following does the friction factor depend for laminar flow?

Prandtl number

Stanton number

Nusselt number

Reynolds number

Solution:

In a footstep bearing, if the radius of the shaft is made four times, what is the torque required to overcome the viscous resistance?

16 times

8 times

256 times

1024 times

Solution:

The shear stress developed in lubricating oil with a viscosity of 9.81 poise, filled between two parallel plates 1.5 cm apart and moving with a relative velocity of 1.75 m/s, is:

20 N/m²

196.2 N/m²

49.05 N/m²

99.05 N/m²

Solution:

Two horizontal plates are placed 250 mm apart with oil of viscosity 20 poise between them. Calculate the shear stress in the oil if the upper plate is moved with a velocity of 1250 mm/s.

10 N/m²

0.1 N/m²

0.2 N/m²

0.02 N/m²

Fluid-mechanics Questions Set 10:

Shear stress in the Newtonian fluid is proportional to

Solution:

What force is necessary for an object to float?

Solution:

Which of the following forces does not act in the downstream direction of the fluid flow?

Solution:

What is the formula for elastic force?

Solution:

The depth of flow for maximum velocity in a circular channel section with diameter equal to 1.5 m is:

Solution:

What is the specific volume of a material with a specific gravity of 0.6?

Solution:

On which of the following does the friction factor depend for laminar flow?

Solution:

In a footstep bearing, if the radius of the shaft is made four times, what is the torque required to overcome the viscous resistance?

Solution:

The shear stress developed in lubricating oil with a viscosity of 9.81 poise, filled between two parallel plates 1.5 cm apart and moving with a relative velocity of 1.75 m/s, is:

Solution:

Two horizontal plates are placed 250 mm apart with oil of viscosity 20 poise between them. Calculate the shear stress in the oil if the upper plate is moved with a velocity of 1250 mm/s.

Solution:

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