Podcast
Questions and Answers
Which statement is incorrect regarding buoyant force?
Which statement is incorrect regarding buoyant force?
- Buoyant force is equal to the weight of the liquid displaced
- Center of buoyancy is located above the center of gravity of the displaced liquid (correct)
- Any weight, floating or immersed in a liquid, is acted upon by a buoyant force
- The point through which buoyant force acts, is called the center of buoyancy
What force lifts a body that is totally or partially immersed in a fluid?
What force lifts a body that is totally or partially immersed in a fluid?
- Less than the weight of the body
- The weight of the body
- More than the weight of the body
- Weight of the fluid displaced by the body (correct)
How can a relatively denser object be made to float on a less dense fluid?
How can a relatively denser object be made to float on a less dense fluid?
- By altering the forces acting on the object
- By altering the shear forces acting on the object
- By altering the shape (correct)
- None of the mentioned
What condition is necessary for the stable equilibrium of a floating body?
What condition is necessary for the stable equilibrium of a floating body?
The metacentric height is defined as the distance between which two points?
The metacentric height is defined as the distance between which two points?
What should occur for a righting couple to be formed in a floating body?
What should occur for a righting couple to be formed in a floating body?
Which statement correctly describes the buoyant force?
Which statement correctly describes the buoyant force?
Which of the following best explains buoyancy?
Which of the following best explains buoyancy?
What is the effect of slow closing valves on water hammer pressure?
What is the effect of slow closing valves on water hammer pressure?
Which number represents the ratio of inertia force to gravitational force?
Which number represents the ratio of inertia force to gravitational force?
Which geometric parameter is crucial for determining the efficiency of a channel?
Which geometric parameter is crucial for determining the efficiency of a channel?
For a channel to be economic, which parameter should be minimized?
For a channel to be economic, which parameter should be minimized?
What is the depth of flow in the most economical circular section to achieve maximum velocity?
What is the depth of flow in the most economical circular section to achieve maximum velocity?
Differential manometers are primarily used to measure what?
Differential manometers are primarily used to measure what?
What condition defines non-uniform flow in a fluid?
What condition defines non-uniform flow in a fluid?
In channel flow, which factor has the least influence on flow shape and resistance?
In channel flow, which factor has the least influence on flow shape and resistance?
Which statement is true about fluids?
Which statement is true about fluids?
What principle states that the resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body?
What principle states that the resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body?
At what temperature is the density of water maximum?
At what temperature is the density of water maximum?
What is the property of a fluid that describes the attraction of its own molecules?
What is the property of a fluid that describes the attraction of its own molecules?
What is the resultant upward pressure of the fluid on an immersed body commonly called?
What is the resultant upward pressure of the fluid on an immersed body commonly called?
The attraction of molecules of different kinds of fluids to each other is called what?
The attraction of molecules of different kinds of fluids to each other is called what?
What primarily causes the action of buoyant force on a body submerged partially or fully in fluid?
What primarily causes the action of buoyant force on a body submerged partially or fully in fluid?
Under what condition will the normal stress in a fluid be constant in all directions at a point?
Under what condition will the normal stress in a fluid be constant in all directions at a point?
What is the term for the center of gravity of the volume of the liquid displaced by an immersed body?
What is the term for the center of gravity of the volume of the liquid displaced by an immersed body?
The specific weight of seawater is higher than that of pure water primarily due to the presence of what?
The specific weight of seawater is higher than that of pure water primarily due to the presence of what?
What is the horizontal component of buoyant force generally regarded as?
What is the horizontal component of buoyant force generally regarded as?
The contraction of a liquid's free surface to the smallest area is driven by which force?
The contraction of a liquid's free surface to the smallest area is driven by which force?
The line of action of the buoyant force acts through which of the following points?
The line of action of the buoyant force acts through which of the following points?
A liquid will wet a solid if the adhesion forces are compared to the cohesion forces are:
A liquid will wet a solid if the adhesion forces are compared to the cohesion forces are:
Which statement is incorrect regarding buoyant force?
Which statement is incorrect regarding buoyant force?
Which of these is not a factor affecting the buoyant force on an object?
Which of these is not a factor affecting the buoyant force on an object?
What is true about the rate of discharge in the main line compared to the discharges in the parallel pipes?
What is true about the rate of discharge in the main line compared to the discharges in the parallel pipes?
Under what condition are two pipe systems considered equivalent?
Under what condition are two pipe systems considered equivalent?
What is the term that describes the ratio of absolute viscosity to mass density?
What is the term that describes the ratio of absolute viscosity to mass density?
Which factors influence the magnitude of the water hammer effect in a pipe?
Which factors influence the magnitude of the water hammer effect in a pipe?
When does the phenomenon of water hammer occur in pipes?
When does the phenomenon of water hammer occur in pipes?
How can water hammer pressure be effectively reduced?
How can water hammer pressure be effectively reduced?
Which of the following statements about equivalent pipe systems is incorrect?
Which of the following statements about equivalent pipe systems is incorrect?
What happens during the water hammer phenomenon?
What happens during the water hammer phenomenon?
Flashcards are hidden until you start studying
Study Notes
Buoyancy
- Floating objects are acted upon by the buoyant force.
- The buoyant force is equal to the weight of the liquid displaced by the floating object.
- The point where the buoyant force acts is known as the center of buoyancy.
- The center of buoyancy is always located above the center of gravity of the displaced liquid.
- According to the principle of buoyancy, a body totally or partially immersed in a fluid will be lifted up by a force equal to the weight of the fluid displaced by the body.
Density
- To make a denser object float on a less dense fluid, alter the shape of the object.
Stability of Floating Bodies
-
The conditions for the stable equilibrium of a floating body are:
- The metacenter should lie above the center of gravity.
- The center of buoyancy and the center of gravity must lie on the same vertical line.
- A righting couple should be formed.
-
Metacentric height is the distance between the center of gravity of the body and the metacenter.
Water Hammer
- Water hammer describes the pressure surge that occurs when a fluid in a pipe is suddenly stopped.
- The magnitude of water hammer depends on:
- The speed at which the valve is closed.
- The length of the pipe.
- The elastic properties of the pipe material.
Geometric Parameter in Channels
- The hydraulic radius determines the efficiency of a channel.
- For a channel to be economical, the wetted perimeter should be minimized.
- The optimum depth for maximum velocity in a circular channel is 0.81D (where D is the diameter of the channel).
Pressure Measurement
- A differential manometer is used to measure the difference in pressure between two points.
Flow Regimes in Fluids
- Non-uniform flow occurs when the velocity, depth, pressure, etc. change from point to point in the fluid flow.
Fluids
- A fluid cannot remain at rest under the action of any shear force.
- The density of water is maximum at 4°C.
- Cohesion is the property of a fluid by which its own molecules are attracted.
- Adhesion is the property of a fluid by which molecules of different kinds of fluids are attracted to each other.
- The normal stress in a fluid will be constant in all directions at a point only if it is at rest.
- Specific weight of sea water is more than that of pure water because it contains dissolved salt.
- The free surface of a liquid tends to contract to the smallest possible area due to the force of surface tension.
- A liquid would wet the solid if the adhesion forces are greater than the cohesion forces.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
