1
MCQ (Single Correct Answer)

GATE ME 2006

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
$${470^ \circ }C$$
2
MCQ (Single Correct Answer)

GATE ME 2006

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
MCQ (Single Correct Answer)

GATE ME 2005

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
A
$$17.2$$
B
$$21.9$$
C
$$28.6$$
D
$$39.2$$
4
MCQ (Single Correct Answer)

GATE ME 2003

Heat is being transferred by convection from water at $${48^ \circ }C$$ to a glass plate whose surface that is exposed to the water is at $${40^0}C.$$ The thermal conductivity of water is $$0.6$$ $$W/mK$$ and the thermal conductivity of glass is $$1.2$$ $$W/mK.$$ The spatial gradient of temp in the water at the water glass interface is
$$dT/dy = 1 \times {10^4}\,\,K/m...$$

The value of the temperature gradient in the glass at the water-glass interface in $$K/m$$ is

A
$$ - 2 \times {10^4}$$
B
$$0.00$$
C
$$0.5 \times {10^4}$$
D
$$2 \times {10^4}$$

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