1
GATE ME 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
A cylindrical uranium fuel rod of radius 5 mm in a nuclear reactor is generating heat at the rate of $$4 \times {10^7}\,\,W/{m^3}.$$ The rod is cooled by a liquid (convective heat transfer coefficient $$1000W/{m^2}$$-$$K$$) at $${25^ \circ }C$$. At steady state, the surface temperature (in $$K$$) of the rod is
A
$$308$$
B
$$398$$
C
$$418$$
D
$$448$$
2
GATE ME 2015 Set 2
MCQ (Single Correct Answer)
+1
-0.3
In the laminar flow of air $$(Pr=0.7)$$ over a heated plate, if $$\delta $$ and $${\delta _T}$$ denote, respectively the hydrodynamic and thermal boundary layer thickness, then
A
$$\delta = {\delta _t}$$
B
$$\delta > {\delta _t}$$
C
$$\delta < {\delta _t}$$
D
$$\delta = 0$$ but $${\delta _t} \ne 0$$
3
GATE ME 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
The total emissive power of a surface is $$500$$ $$W/{m^2}$$ at a temperature $${T_1}$$ and $$1200$$ $$W/{m^2}$$ at a temperature $${T_2}$$, where the temperatures are in Kelvin. Assuming the emissivity of the surface to be constant, the ratio of the temperatures $${{{T_1}} \over {{T_2}}}$$ is
A
$$0.308$$
B
$$0.416$$
C
$$0.803$$
D
$$0.874$$
4
GATE ME 2015 Set 2
MCQ (Single Correct Answer)
+2
-0.6
A balanced counter-flow heat exchanger has a surface area of $$20\,\,{m^2}$$ and overall heat transfer coefficient of $$20$$ $$W/{m^2}$$-$$K$$. Air $$\left( {{C_p} = 1000J/kg - K} \right)$$ entering at $$0.4$$ $$kg/s$$ and $$280$$ $$K$$ is to preheated by the air leaving the system at $$0.4$$ $$kg/s$$ and $$300$$ $$K.$$ The outlet temperature (in $$K$$) of the preheated air is
A
$$290$$
B
$$300$$
C
$$320$$
D
$$350$$
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12