- Re
- Re >> 1, accelerating flow
- Re
- Re >>1, decelerating flow
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In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of?
Answer: Option 3 Let'
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Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is?
Answer: Option 2 Let'
1 Answers 1 views
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to?
Answer: Option 1 The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to -1/3
1 Answers 1 views
Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)?
Answer: Option 1 Fourier's law of heat conduction is k. A. (dT/dx) where Q = Amount of heat flow through the body in unit time, A = Surface area of heat...
1 Answers 1 views
In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as :(where, 'δ' is the boundary layer thickness and 'x' is the distance from the leading edge in the direction of flow).?
Answer: Option 4 Let'
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Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.)?
Answer: Option 1 Let'
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For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)?
Answer: Option 2 Let'
1 Answers 4 views
Which of the following must be followed by the flow of a fluid (real or ideal) (I) Newton's law of viscosity.(II) Newton's second law of motion. (III) The continuity equation.(IV) Velocity of boundary layer must be zero relative to boundary.(V) Fluid cannot penetrate a boundary.?
Answer: Option 2 Let'
1 Answers 6 views
In case of unsteady fluid flow, conditions & flow pattern change with the passage of time at a position in a flow situation. Which of the following is an example of unsteady flow?
Answer: Option 2 Let'
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Which of the following are true regarding ionosphere I. It is the uppermost layer of atmosphere II. The molecules and atoms of nitrogen and oxygen in this layer absorb a part of solar radiation and become ionized III. This layer is responsible for reflecting back the radio wave transmitted from the earth?
Answer: Option 3 The following that are true regarding ionosphere are The molecules and atoms of nitrogen and oxygen in this layer absorb a part of solar radiation and become...
1 Answers 1 views