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GATE ME: Heat Transfer Champion Quiz 3

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Question 1

Grashof number signifies the ratio of

Question 2

The ratio of momentum diffusivity (v) to thermal diffusivity (α), is called

Question 3

Which is correct in respect to turbulence flow?

Question 4

The Blasius equation related to boundary layer theory is a

Question 5

For flow of viscous fluid over a flat plate, if the fluid temperature is the same as the plate temperature, the thermal boundary layer is

Question 6

What happens in thermal boundary layer?

Question 7

In the laminar flow of air (Pr = 0.7) over a heated plate. if δ and δ_T denote, respectively, the hydrodynamic and thermal boundary layer thicknesses, then

Question 8

For laminar forced convection over a flat plate, if the free stream velocity increases by a factor of 2, the average heat transfer coefficient

Question 9

The non-dimensional fluid temperature profile near the surface of a convectively cooled flat plate is given by $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE-ME-2014-Set-1_files\image152.png$ , where y is measured perpendicular to the plate, L is the plate length, and a, b and c are arbitrary constants. $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE-ME-2014-Set-1_files\image153.png$ are wall and ambient temperatures, respectively.

if the thermal conductivity of the fluid is k and the wall heat flux is q", the Nusselt number $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE-ME-2014-Set-1_files\image154.png$ is equal to

Question 10

The ratios of the laminar hydrodynamic boundary layer thickness to thermal boundary layer thickness of flows of two fluids P and Q on a flat plate are $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE EC-ME-17-Mar\GATE-ME-2011_files\image092.png$ and 2 respectively. The Reynolds number based on the plate length for both the flows is 10⁴. The Prandtl and Nusselt numbers for P are $Description: D:\GradeStack Courses\GATE Tests (Sent by Ravi)\GATE EC-ME-17-Mar\GATE-ME-2011_files\image093.png$ and 35 respectively. The Prandtl and Nusselt numbers for Q are respectively

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ESE & GATE ME Heat Transfer

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