1
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
$$0.125$$
2
GATE ME 2006
MCQ (Single Correct Answer)
+2
-0.6
With an increase in the thickness of insulation around a circular pipe, heat loss to surroundings due to
A
Convection increases, while that due to conduction decreases
B
Convection decreases, while that due to conduction increases
C
Convection and conduction decreases
D
Convection and conduction increases
3
GATE ME 2006
MCQ (Single Correct Answer)
+2
-0.6
A $$100$$ $$W$$ electric bulb was switched on in a $$2.5 \times 3 \times 3m$$ size thermally insulated room having temperature of $${20^0}C.$$ Room temp at the end of $$24$$ hours will be
A
$${321^ \circ }C$$
B
$${341^ \circ }C$$
C
$${450^ \circ }C$$
D
$${470^ \circ }C$$
4
GATE ME 2005
MCQ (Single Correct Answer)
+2
-0.6
Heat flows through a composite slab, as shown below. The depth of the slab is $$1$$ $$m.$$ the $$k$$ values are in $$W/m. K.$$ The overall thermal resistance in $$K/W$$ is GATE ME 2005 Heat Transfer - Conduction Question 19 English
A
$$17.2$$
B
$$21.9$$
C
$$28.6$$
D
$$39.2$$
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Turbo Machinery
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