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Fluid-mechanics Questions Set 68:

Quiz Mode

The coefficient of friction for laminar flow is:

Re/16

Re/64

16/Re

64/Re

Solution:

Where can the Navier-Stokes equations be applied?

Ocean Currents

Automobiles

Thermometer

Airplanes

Solution:

Calculate the force exerted by a water jet of 15 mm diameter and velocity 12 m/s when it strikes a flat plate perpendicular to the flow direction.

25.44 N

16.28 N

16.28 kN

25.44 kN

Solution:

Which of the following is correct for irrotational flow in rotational motion?

ω_x + ω_y + ω_z = 0 for irrotational flow

ω_x + ω_y = 200 for irrotational flow

(ω_x + ω_y + ω_z) / (ω_x + ω_y) = 0 for irrotational flow

None of the above

Solution:

In the Eulerian method, the observer concentrates on which of the following?

Single particle movement

Fixed point particles

Single particle and the particle in vicinity to boundary layer

The particle in vicinity to boundary layer

Solution:

Which of the following statements about the relationship between the Hydraulic Grade Line (HGL) and the Energy Grade Line (EGL) are true?

HGL will never coincide with EGL

HGL will never be under EGL

HGL will never be above EGL

HGL may or may not be above EGL

Solution:

For a turbulent flow, which of the following statements is correct?

Fluctuating pressure is equal everywhere

Fluctuating velocity and pressure are equal everywhere

Fluctuating velocity is equal everywhere

Fluctuating velocity and pressure are not equal everywhere

Solution:

Which of the following statements about the Hydraulic Grade Line (HGL) is true?

The HGL always rises in the direction of flow

The HGL may or may not change in the direction of flow

The HGL always drops in the direction of flow

The HGL may or may not change in the direction of flow

Solution:

When two pipes are connected in series, each having the same length and diameter, the equivalent major head loss due to friction is 'h'. If the diameter of one of the pipes is doubled while keeping the length the same, what is the new head loss due to friction?

0.21h

0.31h

0.41h

0.51h

Solution:

Which of the following statements about the flow characteristics based on the Reynolds number is correct?

If Reo ≥ 4,000 and Rei ≥ 5 × 10^5, turbulent flow will take place

If Rei ≥ 4,000 and Reo ≥ 5 × 10^5, turbulent flow will take place

If Rei = Reo = 4,000, then turbulent flow takes place

We cannot determine the flow characteristics by calculating the Reynolds number

Fluid-mechanics Questions Set 68:

The coefficient of friction for laminar flow is:

Solution:

Where can the Navier-Stokes equations be applied?

Solution:

Calculate the force exerted by a water jet of 15 mm diameter and velocity 12 m/s when it strikes a flat plate perpendicular to the flow direction.

Solution:

Which of the following is correct for irrotational flow in rotational motion?

Solution:

In the Eulerian method, the observer concentrates on which of the following?

Solution:

Which of the following statements about the relationship between the Hydraulic Grade Line (HGL) and the Energy Grade Line (EGL) are true?

Solution:

For a turbulent flow, which of the following statements is correct?

Solution:

Which of the following statements about the Hydraulic Grade Line (HGL) is true?

Solution:

When two pipes are connected in series, each having the same length and diameter, the equivalent major head loss due to friction is 'h'. If the diameter of one of the pipes is doubled while keeping the length the same, what is the new head loss due to friction?

Solution:

Which of the following statements about the flow characteristics based on the Reynolds number is correct?

Solution:

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