1
MCQ (Single Correct Answer)

GATE ME 2014 Set 2

Consider a two-dimensional laminar flow over a long cylinder as shown in the figure below.

The free stream velocity is $${U_\infty }$$ and the free stream temperature $${T_\infty }$$ is lower than the cylinder surface temperature $${T_s}.$$ The local heat transfer coefficient is minimum at point

A
$$1$$
B
$$2$$
C
$$3$$
D
$$4$$
2
MCQ (Single Correct Answer)

GATE ME 2014 Set 2

For laminar forced convection over a flat plate, if the free stream velocity increases by a factor of $$2,$$ the average heat transfer coefficient
A
remains same
B
decreased by a factor of $$\sqrt 2 $$
C
rises by a factor of $$\sqrt 2 $$
D
rises by a factor of $$4$$
3
MCQ (Single Correct Answer)

GATE ME 2009

A coolant fluid at $${30^ \circ }C$$ flows over a heated flat plate maintained at a constant temperature of $${100^ \circ }C$$. The boundary layer temp distribution at a given location on the plate may be approximated as $$T=30+70exp(-y),$$ where $$y$$ (in $$m$$) is the distance normal to the plate and $$T$$ is in $$^ \circ C.$$ If thermal conductivity of the fluid is $$1.0W/mk,$$ the local convective heat transfer (in $$W/{m^2}K$$) at that location will be
A
$$0.2$$
B
$$1$$
C
$$5$$
D
$$10$$
4
MCQ (Single Correct Answer)

GATE ME 2008

For flow of fluid over a heated plate, the following fluid properties are known: Viscosity $$=0.001Pa.s;$$ Specific heat at constant pressure $$=1$$ $$kJ/kgK;$$ Thermal conductivity $$=$$ $$W/mK,$$ The hydrodynamic boundary layer thickness at a specified location on the plate is $$1mm,$$ thermal boundary layer thickness at the same location is
A
$$0.001mm$$
B
$$0.01mm$$
C
$$1mm$$
D
$$1000mm$$

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