1
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
For the three dimensional object shown in the fig below. Five faces are insulated. The sixth face $$(PQRS),$$ which is not insulted, interacts thermally with the ambient , with a convective heat transfer coefficient of $$10W/{m^2}K.$$ The ambient temperature is $${30^ \circ }C$$. Heat is uniformly generated inside the object at the rate of $$100W/{m^3}.$$ Assuming the face $$PQRS$$ to be at uniform temperature, its steady state temp is GATE ME 2008 Heat Transfer - Conduction Question 19 English
A
$$10C$$
B
$$20C$$
C
$$30C$$
D
$$40C$$
2
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
Consider steady one-dimensional heat flow in a plate of $$20mm$$ thickness with a uniform heat generation of $$80MW/{m^3}.$$ The left and right faces are kept at constant temperatures of $${160^0}C$$ and $${120^0}C$$ respectively. The plate has a constant thermal conductivity of $$200W/mK.$$

The location of maximum temp within the plate from left face is

A
$$15mm$$
B
$$10mm$$
C
$$5mm$$
D
$$0mm$$
3
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
Consider steady one-dimensional heat flow in a plate of $$20mm$$ thickness with a uniform heat generation of $$80MW/{m^3}.$$ The left and right faces are kept at constant temperatures of $${160^0}C$$ and $${120^0}C$$ respectively. The plate has a constant thermal conductivity of $$200W/mK.$$

The minimum temp within the plate in degree $$C$$ is

A
$$160$$
B
$$165$$
C
$$175$$
D
$$250$$
4
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
Building has to be maintained at $${21^ \circ }C$$ (dry bulb) and $${14.5^ \circ }C$$ (wet bulb). The dew point temp under these conditions is $${10.17^0}C$$. The outside temp is $$ - {23^0}C$$ (dry bulb) and internal and external surface heat transfer coefficients are $$8\,\,W/{m^2}K$$ and $$23$$ $$W/{m^2}K$$ respectively. If the building wall has a thermal conductivity of $$1.2$$ $$W/mK,$$ the minimum thickness (m) of wall required to prevent condensation is
A
$$0.471$$
B
$$0.407$$
C
$$0.321$$
D
$$0.125$$
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