1
GATE ME 2014 Set 4
MCQ (Single Correct Answer)
+2
-0.6
Two infinite parallel plates are placed at a certain distance apart. An infinite radiation shield is inserted between the plates without touching any of them to reduce heat exchange between the plates. Assume that the emissivities of plates and radiation shield are equal. The ratio of the net heat exchange between the plates with and without the shield is
A
$$1/2$$
B
$$1/3$$
C
$$1/4$$
D
$$1/8$$
2
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 ____
3
GATE ME 2014 Set 3
MCQ (Single Correct Answer)
+2
-0.6
A solid sphere of radius$${r_1} = 20\,\,mm$$ is placed concentrically inside a hollow sphere of radius $${r_2} = 30\,\,mm$$ as shown in the figure. GATE ME 2014 Set 3 Heat Transfer - Radiation Question 15 English

The view factor $${F_{21}}$$ for radiation heat transfer is

A
$$2/3$$
B
$$4/9$$
C
$$8/27$$
D
$$9/4$$
4
GATE ME 2013
MCQ (Single Correct Answer)
+2
-0.6
Two large diffuse gray parallel plates, separated by a small distance, have surface temperatures of $$400$$ $$K$$ and $$300$$ $$K.$$ If the emissivities of the surfaces are $$0.8$$ and the Stefan-Boltzmann constant is $$5.67 \times {10^{ - 8}}$$ $$W/{m^2}{K^4},$$ the net radiation heat exchange rate in $$kW/{m^2}$$ between the two plates is
A
$$0.66$$
B
$$0.79$$
C
$$0.99$$
D
$$3.96$$
GATE ME Subjects
Turbo Machinery
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12