Explore topic-wise MCQs in Computational Fluid Dynamics.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Computational Fluid Dynamics knowledge and support exam preparation. Choose a topic below to get started.

1.

What is the physical statement of mass conservation equation for a finite control volume moving along with the flow?

A. Rate of change of mass inside the control volume = 0
B. Rate of change of mass inside the control volume = constant
C. Net mass flow through the control surface = Rate of change of mass inside the control volume
D. Net mass flow through the control surface≠Rate of change of mass inside the control volume
Answer» C. Net mass flow through the control surface = Rate of change of mass inside the control volume
Discussion
2.

Consider a model of finite control volume (volume V and surface area) fixed in space with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\).\(\rho\vec{V}.d\vec{S}\) is positive when _____________

A. fixed in space with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\).\(\rho\vec{V}.d\vec{S}\) is positive when _____________a) The mass flow is outward
B. The mass flow is inward
C. The mass flow is positive
D. The mass flow is negative
Answer» B. The mass flow is inward
Discussion
3.

Consider a model of finite control volume (volume V and surface area) moving along the flow with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\). What is the time rate of change of mass inside the control volume?

A. moving along the flow with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\). What is the time rate of change of mass inside the control volume?a) \(\iiint_V\rho dV\)
B. \(\frac{\partial}{\partial t} \iiint_V\rho dV\)
C. \(\frac{D}{Dt} \iiint_V\rho dV\)
D. ρdV
Answer» D. ρdV
Discussion
4.

Consider a model of finite control volume (volume V and surface area) fixed in space with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\). What is the mass inside the control volume?

A. fixed in space with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\). What is the mass inside the control volume?a) \(\iint_s\rho \vec{V}.d\vec{S}\)
B. \(\iiint_V\rho dV\)
C. ρdV
D. \(\frac{\partial}{\partial t} \iiint_V\rho dV\)
Answer» C. ρdV
Discussion
5.

Consider a model of finite control volume (volume V and surface area S) fixed in space with elemental volume dV, vector elemental surface area d\(\vec{S}\), density ρ and flow velocity \(\vec{V}\). What is the net mass flow rate out of the surface area?

A. \(\iint_V\rho \vec{V}.dV\)
B. \(\rho \vec{V}.d \vec{S}\)
C. \(\iiint_V\rho \vec{V}.d\vec{S}\)
D. \(\iint_V\rho \vec{V}.d\vec{S}\)
Answer» E.
Discussion
6.

The physical principle behind the continuity equation is __________

A. Mass conservation
B. Zeroth law of thermodynamics
C. First law of thermodynamics
D. Energy conservation
Answer» B. Zeroth law of thermodynamics
Discussion