Quiz
Bernouilli equation
Create a free account to finish this quiz
Save your progress and see your final score.
Already have an account? Sign in
Questions in this quiz (8)
1The Bernouilli equation is
- Aapplicable for steady flows
- Bapplicable in presence of components that disturb the streamlined structure of the flow
- Capplicable in presence of pumps, turbines, impellers...
- Dvalid for constant density fluid
- Ecan be applied along a streamline
2The Bernouilli equation
- ACan be used to measure the cruise velocity of a flying plane
- BCan be used to determine the time needed to empty a large tank
- CCannot be used to predict evaporation in a liquid due to pressure drops
- DCannot be generalized to include the effect of friction forces
- ECan be applied in the case of non-uniform velocity fields
- FCan be extended to include the effect of pumps and turbines
3The Bernouilli equation states that the sum of the kinetic and potential energies of a fluid particle is constant along a streamline, during steady flow when the compressibility and frictional effects are negligible
- ATrue
- BFalse
4The total pressure is the sum of dynamic, hydrostatic and thermodynamic pressure
- ATrue
- BFalse
5The pressure drops
- ADepend on a friction coefficient, which changes in laminar and turbulent regime
- BDepend linearly on the velocity in turbulent regime
- CDepend linearly on the velocity in laminar regime
- DConsist of distributed and concentrated pressure drops
- EDepend on a friction coefficient, whose expression is the same for distributed and concentrated pressure losses
6In turbulent flow, the shear stress
- AIs the sum of a laminar and a turbulent component
- BCan be simply obtained by replacing the local velocity by the mean velocity
- Cis larger than in laminar flow
- DCan be related to the diffusive flux of momentum associated to the fluctuating velocity component
- ECan be expressed in analogy to the laminar shear stress, introducing a fluid property called turbulent viscosity
7The velocity profile in a turbulent flow
- AIs parabolic as in a laminar flow
- BIs characterized by a flat core region, with a sharp drop at the wall
- CConsists of 3 regions, viscous, inertial and turbulent layers
- DConsists of 4 regions, viscous, buffer, inertial and turbulent layers
- EIs linear close to the wall, du to the dominant viscous effects
8The boundary layer thickness
- AGrows with x^0.5, while the relative thickness of the boundary layer decreases with Re^0.5.
- Bcan be estimated using a unique approach
- Ccan be determined using approaches of increasing complexity, force balance, integral method and Blasius solution
- Dcan be determined using the integral method postulating a cubic velocity profile
Information
- Description
- Fluid mechanics Quiz on Bernouilli equation, created by Théo Rizzo on 04/01/2022.
- Author
- Théo Rizzo
- Language
- English
- Views
- 0
- Tags
- Rating
- No ratings yet Rate this quiz