Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering Page-4 section-2

Section 1 Section 2 Section 3 Section 4 Section 5 Section 6 Section 7

31.
The force of buoyancy is always __________ the weight of the liquid displaced by the body.

A. Equal to

B. Less than

C. More than

D. None of these

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32.
For a floating body to be in stable equilibrium, its metacentre should be

A. Below the center of gravity

B. Below the center of buoyancy

C. Above the center of buoyancy

D. Above the center of gravity

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33.
The point at which the resultant pressure on an immersed surface acts, is known as

A. Centre of gravity

B. Centre of depth

C. Centre of pressure

D. Centre of immersed surface

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34.
A turbine pump is basically a centrifugal pump equipped additionally with

A. Adjustable blades

B. Backward curved blades

C. Vaned diffusion casing

D. Inlet guide blades

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35.
When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of

A. A triangle

B. A paraboloid

C. An ellipse

D. None of these

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36.
In one dimensional flow, the flow

A. Is steady and uniform

B. Takes place in straight line

C. Takes place in curve

D. Takes place in one direction

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37.
The resultant of all normal pressures acts

A. At C.G. of body

B. At center of pressure

C. Vertically upwards

D. At metacentre

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38.
The stability of a dam is checked for

A. Tension at the base

B. Overturning of the wall or dam

C. Sliding of the wall or dam

D. All of these

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39.
Any change in load is adjusted by adjusting following parameter on turbine

A. Net head

B. Absolute velocity

C. Blade velocity

D. Flow

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40.
Flow of water in a pipe about 3 meters in diameter can be measured by

A. Orifice plate

B. Venturimeter

C. Rotameter

D. Pitot tube

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Answer & Solution

Answer: Option B

Solution:

Option A: Orifice Plate

An orifice plate measures flow by creating a pressure drop across a sharp-edged plate with a hole in it. The flow rate is calculated from this pressure difference.

Limitations: Although simple and inexpensive, it causes significant head loss and is less efficient for very large diameter pipes like 3 m. Over time, wear and tear can affect accuracy.

Option B: Venturimeter

A Venturimeter works on Bernoulli’s theorem, where the fluid passes through a converging section, a throat, and then a diverging section. The difference in pressure between the inlet and throat is used to calculate the flow rate.

Advantages: It produces low head loss, can handle large flow volumes, and gives accurate results even in very large diameter pipes. Its design makes it highly suitable for permanent installation in high-capacity systems like a 3 m water pipe.

Option C: Rotameter

A Rotameter is a variable area flowmeter where a float moves up and down inside a tapered vertical tube depending on the flow rate.

Limitations: It is mainly used for small to medium flow rates and works only in vertical orientation. It is impractical for huge diameters such as 3 m, both due to size limitations and mechanical constraints.

Option D: Pitot Tube

A Pitot tube measures the velocity of the fluid at a single point by comparing stagnation and static pressure.

Limitations: To determine total flow in a large pipe, multiple velocity measurements at various points are required, along with integration of the velocity profile. This is cumbersome and less accurate compared to using a Venturimeter for a 3 m diameter pipe.

Conclusion: Among the given options, the Venturimeter is the most suitable for measuring flow in a large diameter (about 3 m) water pipe because it is accurate, causes minimal head loss, and is practical for large-scale applications.

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Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering

31. The force of buoyancy is always __________ the weight of the liquid displaced by the body.

Answer & Solution

32. For a floating body to be in stable equilibrium, its metacentre should be

Answer & Solution

33. The point at which the resultant pressure on an immersed surface acts, is known as

Answer & Solution

34. A turbine pump is basically a centrifugal pump equipped additionally with

Answer & Solution

35. When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of

Answer & Solution

36. In one dimensional flow, the flow

Answer & Solution

37. The resultant of all normal pressures acts

Answer & Solution

38. The stability of a dam is checked for

Answer & Solution

39. Any change in load is adjusted by adjusting following parameter on turbine

Answer & Solution

40. Flow of water in a pipe about 3 meters in diameter can be measured by

Answer & Solution

Read More Section(Hydraulics and Fluid Mechanics in ME)

31.
The force of buoyancy is always __________ the weight of the liquid displaced by the body.

32.
For a floating body to be in stable equilibrium, its metacentre should be

33.
The point at which the resultant pressure on an immersed surface acts, is known as

34.
A turbine pump is basically a centrifugal pump equipped additionally with

35.
When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of

36.
In one dimensional flow, the flow

37.
The resultant of all normal pressures acts

38.
The stability of a dam is checked for

39.
Any change in load is adjusted by adjusting following parameter on turbine

40.
Flow of water in a pipe about 3 meters in diameter can be measured by