Computational Fluid Dynamics MCQ
Which of the following ratio determines the value of Taylor Number?
Answer
Correct Answer:
Inertia force due to rotation / viscous force of a fluid
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Which of the following ratio determines the value of Rayleigh Number?
Answer
Correct Answer:
Buoyancy force / viscous force
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Which of the following ratio determines the value of Peclet Number?
Answer
Correct Answer:
Advective transport rate / thermal diffusive transport rate
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____ ratio determines the Lewis number.
Answer
Correct Answer:
Thermal diffusivity / mass diffusivity
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Which ratio determines the Fourier number?
Answer
Correct Answer:
Diffusive transport rate of heat / storage rate of heat
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Which of the following ratio indicates the Euler number?
Answer
Correct Answer:
Inertia force / gravitational force
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Which of the following is the Weber number?
Answer
Correct Answer:
Inertia force / surface tension
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Which of the following parameter determines Biot number?
Answer
Correct Answer:
Both 1 and 4
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Which of the following ratio determines the Nusselt number?
Answer
Correct Answer:
Convection heat transfer and conduction heat transfer
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Which of the following ration indicates Prandtle number?
Answer
Correct Answer:
Momentum diffusivity and thermal diffusivity
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In a tranquil flow in an open channel,
Answer
Correct Answer:
Depth of water > critical depth
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Which of the following ratio will give you Froude number?
Answer
Correct Answer:
Inertial force / gravitational force
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Which of the following ratio is the Reynolds number?
Answer
Correct Answer:
Inertia force and viscous force
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Darcy’s Friction Factor is ____ (Where Re is the Reynolds Number) When there is a laminar flow in a smooth pipe.
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In which case, you can apply Bernoulli’s Equation?
Answer
Correct Answer:
Laminar, steady flow
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For which of the following cases, you should use Navier Stokes Equation?
Answer
Correct Answer:
Viscous flow
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In a pipe flow, which of the following relation is true for a laminar flow?
Answer
Correct Answer:
Velocity V = 0.5 Umax
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For irrotational flow, the flow equation is:
Answer
Correct Answer:
∂2 Ψ /∂x2 + ∂2 Ψ /∂y2= 0
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The continuity equation for a two dimensional flow is:
Answer
Correct Answer:
∂u/∂x + ∂v/∂y =0
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When the fluid properties don’t change with respect to the position at a particular time, the flow is ____.
Answer
Correct Answer:
Uniform flow
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When the fluid properties don’t change with respect to time, the flow is ____.
Answer
Correct Answer:
Steady flow
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When Reynolds number is more than 10,000, the flow is ____.
Answer
Correct Answer:
Turbulent
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When Reynolds number is less than 2000, the flow is ____.
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In case of turbulent flow, the flow-losses are ____.
Answer
Correct Answer:
Proportional to V2
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In case of laminar flow, the flow-losses are ____.
Answer
Correct Answer:
Proportional to V
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How will you come to know that the flow is laminar?
Answer
Correct Answer:
By Reynolds number
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If the surface of a liquid is concave, the cohesion force is ____.
Answer
Correct Answer:
Decreased
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Cavitation occurred in a fluid is due to ____.
Answer
Correct Answer:
Low pressure
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By which of the following instrument, you can measure specific gravity?
Answer
Correct Answer:
Hydrometer
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Which of the following phenomenon is responsible for the shape of the raindrop as spherical?
Answer
Correct Answer:
Surface tension
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The specific gravity of fluid is 0.85. The viscosity of this fluid is 0.0085 N-Sec/m2. Its kinematic viscosity in m2/sec is ____.
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The pressure of oil is equivalent to 40 metre of water column. Specific gravity of oil is 0.80. What is the pressure of oil in terms of metre?
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A balloon is moving in the air. It follows the law of ____.
Answer
Correct Answer:
Archimedes
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Viscosity of water is ____.
Answer
Correct Answer:
Less than that of oil
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When the temperature of a gas rises, the viscosity ____.
Answer
Correct Answer:
Increases
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Which of the following is defined as centre of buoyancy?
Answer
Correct Answer:
Centroid of the fluid displaced by the body
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Comparison of viscosity is done by ____.
Answer
Correct Answer:
Red wood viscometer
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When a body is kept inside water, it will be in neutral equilibrium if ____( where, M is the metacenter and G is the center of gravity).
Answer
Correct Answer:
M is at G i.e. both points coincide
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When a body is kept inside water, it will be in unstable equilibrium if ____( where, M is the metacentre and G is the centre of gravity).
Answer
Correct Answer:
M is below G
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When a body is kept inside water, it will be in stable equilibrium if ____( where, M is the metacentre and G is the centre of gravity).
Answer
Correct Answer:
M is above G
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Metacentre is the intersection of ____.
Answer
Correct Answer:
Buoyant force and the centreline of the body.
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Which of the following statesman is not correct?
Answer
Correct Answer:
Atmospheric pressure + absolute pressure = gauge pressure
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Which of the following law states that the intensity of pressure at any point within a static fluid is the same in all directions?
Answer
Correct Answer:
Pascal’s law
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When ____, you will see that boiling occurs.
Answer
Correct Answer:
Vapor pressure at a temperature is equal to the pressure above the liquid surface at the same temperature.
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When ____, you will see that Vaporisation occurs.
Answer
Correct Answer:
Vapor pressure at a temperature is greater than the pressure above the liquid surface at the same temperature.
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Surface tension on a liquid jet is ____ (where d is the diameter of the droplet and σ is the surface tension.)
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Surface tension on a hollow bubble is ____ (where d is the diameter of the droplet and σ is the surface tension.)
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Surface tension on a liquid droplet is ____ (where d is the diameter of the droplet and σ is the surface tension.)
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The unit of surface tension is:
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Compressibility is the ratio of ____.
Answer
Correct Answer:
Volumetric strain and increase of pressure
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Bulk modulus is the ratio of ____.
Answer
Correct Answer:
Increase of pressure and volumetric strain
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For a compressible subsonic flow, Mach number is____.
Answer
Correct Answer:
Greater than 0.3 and less than 1
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For an incompressible flow, the Mach number is ____.
Answer
Correct Answer:
Less than 0.3
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Fly ash is the example of ____.
Answer
Correct Answer:
Bingham fluid
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Mach number is the ratio of ____.
Answer
Correct Answer:
(Velocity of a fluid)/(velocity of sound)
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Which one of the following is not a Newtonian fluid?
Answer
Correct Answer:
Tooth-paste
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Poise is the unit of ____.
Answer
Correct Answer:
Dynamic viscosity
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Which one of the following is a wrong statesman?
Answer
Correct Answer:
The viscosity of real fluid is zero
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Newton’s law of viscosity is ____.
Answer
Correct Answer:
Shear stress is directly proportional to rate of shear strain
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One stoke is equal to ____.
Answer
Correct Answer:
10-4 m2/sec
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Stoke is the unit of:
Answer
Correct Answer:
Kinematic viscosity
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Kinematic viscosity is the ratio of ____.
Answer
Correct Answer:
Dynamic viscosity and density of the fluid
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The unit of specific weight is:
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Which of the following should be treated as incompressible?
Answer
Correct Answer:
Ideal fluid
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A real fluid is considered as ____.
Answer
Correct Answer:
Compressible
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What do you think about an ideal fluid ____?
Answer
Correct Answer:
Incompressible
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Which one of the following will you treat as an ideal gas?
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Which one of the following will you treat as ideal liquid?
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By which of the following you can measure the compressibility characteristics of a fluid?
Answer
Correct Answer:
Mach number
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What do you think about an Incompressible fluid?
Answer
Correct Answer:
It has variable density
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What do you think about a Compressible fluid?
Answer
Correct Answer:
It has variable density
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Which of the following substances don’t have free surfaces?
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Fluid is a substance that ____.
Answer
Correct Answer:
Both 3 and 4
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What is the purpose of the Streamline Plot?
Answer
Correct Answer:
To show the trajectory that a very small particle would trace if immersed in the flow
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What is the name of another post processing tool?
Answer
Correct Answer:
Streamline Plot
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How many dimensions does a Contour Plot typically have?
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What is one way to visualize the results of a CFD analysis?
Answer
Correct Answer:
Contour Plot
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What are typically used to help the user in this task?
Answer
Correct Answer:
Post processing tools
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What is the phase where the user looks at the analysis data?
Answer
Correct Answer:
Postprocessing
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What is it called when one stops the iterative method to reach the correct solution?
Answer
Correct Answer:
Convergence
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What are the Fluid Dynamics equations often solved by?
Answer
Correct Answer:
Numerical methods
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What is the term used to describe the values that quantities like velocity, pressure, temperature assumes on the Domain Limits?
Answer
Correct Answer:
Boundary Condition
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When the water enters the pipe, a another boundary condition is the value of?
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The boundary condition values are also known as?
Answer
Correct Answer:
Domain Limits
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Which type of variable is specified with a boundary condition?
Answer
Correct Answer:
Domain Boundary
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What is a type of value that boundary conditions assume?
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When the flow starts the values of water velocity inside the pipe change from what value to the final values?
Answer
Correct Answer:
Initial value
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What do we call a change in the value of water velocity that takes place when the water enters a pipeline?
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When the flow starts the values of what change from their initial value to the final values?
Answer
Correct Answer:
Water velocity
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What is the name of the analysis that is said to be Steady?
Answer
Correct Answer:
Steady/Unsteady Analysis
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What is the name of the type of flow that changes the values of the water inside the pipe?
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What is the term for the flow that has been going long enough?
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What are the Incompressible flows?
Answer
Correct Answer:
Those involving liquid but also air
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What are flows involving liquid but also air called?
Answer
Correct Answer:
Incompressible flows
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What is stored in every cell?
Answer
Correct Answer:
One single value for each quantity
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What's the basic element of the Computational Grid?
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How many values are stored in a cell?
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What is stored in every cell of the computational grid?
Answer
Correct Answer:
One single value for each quantity
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What does CFD describe in a given condition?
Answer
Correct Answer:
The behaviour of a given fluid
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What is an example of a field in which CFD is used?
Answer
Correct Answer:
To describe the air motion around a vehicle
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What kind of field can be benefited from the use of CFD?
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What is an example of a fluid?
Answer
Correct Answer:
Gas or liquid
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What does CFD stand for?
Answer
Correct Answer:
Computational Fluid Dynamics
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In a parking lot, what is the problem that CFD is used to solve?
Answer
Correct Answer:
Smoke dispersion
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What is used to describe the air motion around a vehicle?
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What is another term for Computational Fluid Dynamics?
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What is the name of the science that describes the motion of a fluid?
Answer
Correct Answer:
Fluid Dynamics
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