1
GATE ME 2014 Set 2
MCQ (Single Correct Answer)
+1
-0.3
Consider a two-dimensional laminar flow over a long cylinder as shown in the figure below. GATE ME 2014 Set 2 Heat Transfer - Convection Question 30 English

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
GATE ME 2014 Set 2
MCQ (Single Correct Answer)
+1
-0.3
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
GATE ME 2014 Set 2
Numerical
+2
-0
A hemispherical furnace of $$1$$ $$m$$ radius has the inner surface (emissivity, $$\varepsilon = 1$$) of its roof maintained at $$800K,$$ while its floor $$\left( {\varepsilon = 0.5} \right)$$ is kept at $$600K$$. Stefan-Boltzmannn constant is $$\,5.668 \times {10^{ - 8}}$$ $$W/{m^2}.{K^4}.$$ The net radiative heat transfer (in $$kW$$) from the roof to the floor is __________.
Your input ____
4
GATE ME 2014 Set 2
Numerical
+2
-0
Water flows through a tube of diameter $$25mm$$ at an average velocity of $$1.0m/s.$$ The properties of water are $$\rho = 1000\,\,kg/{m^3},$$ $$\mu = 7.25 \times {10^{ - 4}}\,\,N.s/{m^2},$$ $$\,K = 0.625W/m.K,$$ $$Pr=4.85.$$ Using $$Nu=0.023$$ $$R{e^{0.8}}\,\,{\Pr ^{0.4}},$$ the convective heat transfer coefficient (in $$W/{m^2}.K$$) is ______________.
Your input ____
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