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Fluid-mechanics Questions Set 28:

Quiz Mode

What is the unit of the Reynolds number?

N/m^2

m/s

N-m/sec

Dimensionless

Solution:

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

Friction

Pressure

Gravity

Weight

Solution:

When the hydraulic jump is in a moving form, it is called

Negative surge

Turbulent surge

Positive surge

Accelerated surge

Solution:

A body with dimensions 2.7 m × 3.8 m × 2.5 m weighs 2500 N in water. Find its weight in air.

254.12 kN

101.65 kN

508.25 kN

127.06 kN

Solution:

If dynamic viscosity is represented by η and fluid density is represented by ρ, then kinematic viscosity is determined as

η/ρ

ηρ

ρ/η

Solution:

The apparent viscosity of a fluid is given by 0.007*(du/dy)^0.3, then the type of fluid is

Bingham plastic

Dilatant

Thixotropic

Pseudo-plastic

Solution:

What acceleration would cause the free surface of a liquid contained in an open tank moving in a horizontal track to dip by 45°?

g/2

3g/2

Solution:

What is the eddy viscosity for turbulent flow?

a function of temperature only

a physical property of the fluid

dependent on flow

independent of the flow

Solution:

A floating body is said to be in a state of stable equilibrium when:

When its metacentric height is zero.

When the metacenter is above the center of gravity

Only when its center of gravity is below its center of buoyancy

When the metacenter is below the center of gravity

Solution:

A glass U-tube has two limbs of internal diameter 6 mm and 16 mm, respectively, and contains water. Calculate the difference in water level in the two limbs due to capillary action. The surface tension of water-glass is 0.073 N/m, and the angle of contact can be assumed to be zero. Assume the density of the liquid is 1000 kg/m³ and g = 9.8 m/s².

31 mm

3.1 mm

30.4 mm

3 mm

Fluid-mechanics Questions Set 28:

What is the unit of the Reynolds number?

Solution:

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

Solution:

When the hydraulic jump is in a moving form, it is called

Solution:

A body with dimensions 2.7 m × 3.8 m × 2.5 m weighs 2500 N in water. Find its weight in air.

Solution:

If dynamic viscosity is represented by η and fluid density is represented by ρ, then kinematic viscosity is determined as

Solution:

The apparent viscosity of a fluid is given by 0.007*(du/dy)^0.3, then the type of fluid is

Solution:

What acceleration would cause the free surface of a liquid contained in an open tank moving in a horizontal track to dip by 45°?

Solution:

What is the eddy viscosity for turbulent flow?

Solution:

A floating body is said to be in a state of stable equilibrium when:

Solution:

Solution:

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