Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > Which one of the follflowing is correct?a)the...
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Which one of the follflowing is correct?
- a)the frictional resistance is always dependent on the nature of the surface area of contact
- b)the frictional resistance is always independent of the nature of the surface area of contact
- c)the frictional resistance is dependent on the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocity
- d)the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocity
Correct answer is option 'D'. Can you explain this answer?
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Which one of the follflowing is correct?a)the frictional resistance is...
Explanation: Frictional resistance is dependent on the nature of the surface area of contact. But, when the liquid flows at a velocity less than the critical velocity, a thin stationary film of the liquid is formed on the supporting surface. Hence, the frictional resistance becomes independent of the nature of the surface of contact.
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Which one of the follflowing is correct?a)the frictional resistance is...
Frictional resistance in fluid flow:
The frictional resistance in fluid flow refers to the resistance encountered by a fluid as it flows through a conduit or pipe. This resistance is primarily due to the interaction between the fluid and the surface of the conduit. The nature of this interaction can vary depending on the surface area of contact and the velocity of the fluid.
Dependence on the nature of the surface area of contact:
The frictional resistance in fluid flow is indeed dependent on the nature of the surface area of contact. When the fluid flows over a rough surface, the irregularities and asperities on the surface can cause more frictional resistance. On the other hand, if the surface is smooth, the contact between the fluid and the surface is reduced, resulting in less frictional resistance.
Dependence on the velocity of the fluid:
The velocity of the fluid also plays a role in determining the frictional resistance. When the fluid flows at a velocity less than the critical velocity, the frictional resistance is indeed dependent on the nature of the surface area of contact. This is because at lower velocities, the fluid has more contact with the surface, and any irregularities or roughness on the surface can cause more resistance.
Independent of the nature of the surface area of contact:
However, when the fluid flows at a velocity greater than the critical velocity, the frictional resistance becomes independent of the nature of the surface area of contact. At higher velocities, the fluid forms a boundary layer close to the surface, which reduces the influence of the surface roughness on the overall frictional resistance. In this case, the resistance is primarily governed by the flow regime and the properties of the fluid itself, such as viscosity.
Conclusion:
In conclusion, the correct option is D, which states that the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocity. At higher velocities, the nature of the surface area of contact becomes less significant in determining the frictional resistance.
The frictional resistance in fluid flow refers to the resistance encountered by a fluid as it flows through a conduit or pipe. This resistance is primarily due to the interaction between the fluid and the surface of the conduit. The nature of this interaction can vary depending on the surface area of contact and the velocity of the fluid.
Dependence on the nature of the surface area of contact:
The frictional resistance in fluid flow is indeed dependent on the nature of the surface area of contact. When the fluid flows over a rough surface, the irregularities and asperities on the surface can cause more frictional resistance. On the other hand, if the surface is smooth, the contact between the fluid and the surface is reduced, resulting in less frictional resistance.
Dependence on the velocity of the fluid:
The velocity of the fluid also plays a role in determining the frictional resistance. When the fluid flows at a velocity less than the critical velocity, the frictional resistance is indeed dependent on the nature of the surface area of contact. This is because at lower velocities, the fluid has more contact with the surface, and any irregularities or roughness on the surface can cause more resistance.
Independent of the nature of the surface area of contact:
However, when the fluid flows at a velocity greater than the critical velocity, the frictional resistance becomes independent of the nature of the surface area of contact. At higher velocities, the fluid forms a boundary layer close to the surface, which reduces the influence of the surface roughness on the overall frictional resistance. In this case, the resistance is primarily governed by the flow regime and the properties of the fluid itself, such as viscosity.
Conclusion:
In conclusion, the correct option is D, which states that the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocity. At higher velocities, the nature of the surface area of contact becomes less significant in determining the frictional resistance.
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Which one of the follflowing is correct?a)the frictional resistance is always dependent on the nature of the surface area of contactb)the frictional resistance is always independent of the nature of the surface area of contactc)the frictional resistance is dependent on the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityd)the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityCorrect answer is option 'D'. Can you explain this answer?
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Which one of the follflowing is correct?a)the frictional resistance is always dependent on the nature of the surface area of contactb)the frictional resistance is always independent of the nature of the surface area of contactc)the frictional resistance is dependent on the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityd)the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityCorrect answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Which one of the follflowing is correct?a)the frictional resistance is always dependent on the nature of the surface area of contactb)the frictional resistance is always independent of the nature of the surface area of contactc)the frictional resistance is dependent on the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityd)the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the follflowing is correct?a)the frictional resistance is always dependent on the nature of the surface area of contactb)the frictional resistance is always independent of the nature of the surface area of contactc)the frictional resistance is dependent on the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityd)the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityCorrect answer is option 'D'. Can you explain this answer?.
Which one of the follflowing is correct?a)the frictional resistance is always dependent on the nature of the surface area of contactb)the frictional resistance is always independent of the nature of the surface area of contactc)the frictional resistance is dependent on the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityd)the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityCorrect answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Which one of the follflowing is correct?a)the frictional resistance is always dependent on the nature of the surface area of contactb)the frictional resistance is always independent of the nature of the surface area of contactc)the frictional resistance is dependent on the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityd)the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the follflowing is correct?a)the frictional resistance is always dependent on the nature of the surface area of contactb)the frictional resistance is always independent of the nature of the surface area of contactc)the frictional resistance is dependent on the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityd)the frictional resistance is independent of the nature of the surface area of contact when the liquid flows at a velocity less than the critical velocityCorrect answer is option 'D'. Can you explain this answer?.
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