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Test: Kinetic Energy Correction Factor - Civil Engineering (CE) MCQ


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10 Questions MCQ Test Fluid Mechanics for Civil Engineering - Test: Kinetic Energy Correction Factor

Test: Kinetic Energy Correction Factor for Civil Engineering (CE) 2024 is part of Fluid Mechanics for Civil Engineering preparation. The Test: Kinetic Energy Correction Factor questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Kinetic Energy Correction Factor MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Kinetic Energy Correction Factor below.
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Test: Kinetic Energy Correction Factor - Question 1

For laminar flow in a circular conduits, the energy correction factor α is taken as:-

Detailed Solution for Test: Kinetic Energy Correction Factor - Question 1

Kinetic energy correction factor(α): 

  • It is defined as the ratio of kinetic energy/second based on actual velocity to the kinetic energy/second based on average velocity.
  • where A = area, V= average velocity, u= local velocity at distance r.
  • In circular pipe laminar flow α = 2
Test: Kinetic Energy Correction Factor - Question 2

The kinetic energy correction factor for laminar flow through circular pipes is

Detailed Solution for Test: Kinetic Energy Correction Factor - Question 2

It is assumed in the derivation of Bernoulli equation that the velocity at the both end sections is uniform. But in a practical situation this may not be the case and the velocity can very across the cross section. A remedy is to use a correction factor for the kinetic energy term in the equation. Its value for a fully developed laminar pipe flow is around 2, whereas for a turbulent pipe flow it is between 1.04 to 1.11. It is usual to take it is 1 for a turbulent flow. It should not be neglected for a laminar flow.  

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Test: Kinetic Energy Correction Factor - Question 3

The value of kinetic energy correction factor for laminar flow through a circular pipe of radius R is _____. (Correct up to 2 decimals)


Detailed Solution for Test: Kinetic Energy Correction Factor - Question 3

Kinetic energy correction factor(α): 

  • It is defined as the ratio of kinetic energy/second based on actual velocity to the kinetic energy/second based on average velocity.
  • where A = area, V= average velocity, u= local velocity at distance r.
  • For laminar flow in a circular pipe α = 2  
Test: Kinetic Energy Correction Factor - Question 4

What is the value of kinetic energy factor during a laminar flow?

Detailed Solution for Test: Kinetic Energy Correction Factor - Question 4

Kinetic energy factor for a fully developed laminar flow is around 2. Laminar flow occurs when a fluid flows in parallel layers. The flow must not have any sort of disruption between the layers of fluid. The fluid flows without a lateral mixing which makes it slide past one another.

Test: Kinetic Energy Correction Factor - Question 5

If you double the kinetic energy of an arrow, by what factor does its speed increase?

Detailed Solution for Test: Kinetic Energy Correction Factor - Question 5

Kinetic energy depends upon velocity and mass. The relation between K.E with mass and velocity is K.E = 0.5mv2. If we double the kinetic energy, the velocity has to be increased by a factor equal to the square root of two.

Test: Kinetic Energy Correction Factor - Question 6

When a bullet hits a solid block and gets embedded into it. What is conserved?

Detailed Solution for Test: Kinetic Energy Correction Factor - Question 6

When the bullet is released from the gun, it moves through the individual air molecules. These molecules tend to vibrate which cannot be seen though our naked eye. The solid block acts as a “momentum sink”. It’s so big when compared to a tiny bullet that it can absorb all the momentum without visibly moving.

Test: Kinetic Energy Correction Factor - Question 7

When a charged body enters a uniform magnetic field. How will it’s kinetic energy change?

Detailed Solution for Test: Kinetic Energy Correction Factor - Question 7

The kinetic energy remains a constant as the magnetic field always exerts a force perpendicular to the particle’s velocity. So, there is no change in the velocity of the fluid. Therefore, kinetic energy remains the same.

Test: Kinetic Energy Correction Factor - Question 8

If a cricket ball moves with a velocity ‘v’ and collides with a tiny table tennis ball. After an elastic collision, at what velocity will the second ball move?

Detailed Solution for Test: Kinetic Energy Correction Factor - Question 8

Since the collision is elastic, the cricket ball having a higher mass than that of the tiny table tennis ball will hit and generate a higher velocity. After immediate impact, the table tennis ball will move exactly with twice the velocity of the cricket ball.

Test: Kinetic Energy Correction Factor - Question 9

Which among the following is not an application of the Bernoulli?

Detailed Solution for Test: Kinetic Energy Correction Factor - Question 9

This is mainly because, Bernoulli’s equation is applied only when the fluid is irrotational. It means that the stream lines are not supposed to intersect each other. Also, the equation does not take viscosity into account. Thus, the flow rate decreases when you close the valve.

Test: Kinetic Energy Correction Factor - Question 10

What is the function of Reynolds number?

Detailed Solution for Test: Kinetic Energy Correction Factor - Question 10

Reynolds number is a dimensionless quantity. It is used to predict flow patterns in different types of fluid flow. At lower Reynold’s number, the flow is laminar. At higher Reynolds number, the flow is turbulent.

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