1
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
$$3.96$$
2
GATE ME 2013
MCQ (Single Correct Answer)
+2
-0.6
Water (specific heat, $${c_p} = 4.18\,\,kJ/kgK$$ ) enters a pipe at a rate of $$0.01$$ $$kg/s$$ and temperature of $${20^ \circ }C.$$ The pipe, of diameter $$50$$ $$mm$$ and length $$3$$ $$m,$$ is subjected to a wall heat flux $${q_w}$$ in $$W/{m^2}:$$

If $${q_w}$$ $$=5000$$ and the convection heat transfer coefficient at the pipe outlet is $$1000$$ $$W/{m^2}K,$$ the temperature in $$^ \circ C$$ at the inner surface of the pipe at the outlet is

A
$$71$$
B
$$76$$
C
$$79$$
D
$$81$$
3
GATE ME 2013
MCQ (Single Correct Answer)
+2
-0.6
Water (specific heat, $${c_p} = 4.18\,\,kJ/kgK$$ ) enters a pipe at a rate of $$0.01$$ $$kg/s$$ and temperature of $${20^ \circ }C.$$ The pipe, of diameter $$50$$ $$mm$$ and length $$3$$ $$m,$$ is subjected to a wall heat flux $${q_w}$$ in $$W/{m^2}:$$

If $${q_w}$$ $$=2500x,$$ where $$x$$ is $$m$$ and in the direction of flow ($$x=0$$ at the inlet), the bulk mean temperature of the water leaving the pipe in $$^ \circ C$$ is

A
$$42$$
B
$$62$$
C
$$74$$
D
$$104$$
4
GATE ME 2013
MCQ (Single Correct Answer)
+1
-0.3
In simple exponential smoothing forecasting, to give higher weightage to recent demand information, the smoothing constant must be close to
A
$$-1$$
B
zero
C
$$0.5$$
D
$$1.0$$
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