1
GATE ME 1993
+2
-0.6
The radiative heat transfer rate per unit area $$\left( {W/{m^2}} \right)$$ between two plane parallel gray surfaces (emissivity $$=0.9$$) maintained at $$400K$$ and $$300K$$ is ($${{\sigma _b} = }$$ Stephen Boltzmann constant $$5.67 \times {10^{ - 8}}\,\,W/{m^2}{K^4}$$)
A
$$992$$
B
$$812$$
C
$$464$$
D
$$567$$
2
GATE ME 1993
Subjective
+5
-0
For a small project with five jobs, the following data is given (i) Draw the project network in activity on arc mode
(ii) Under $$PERT$$ assumptions, determine the distribution of project duration.
3
GATE ME 1993
+1
-0.3
The outside diameter of a hollow shaft is twice its inside diameter. The ratio of its torque carrying capacity to that of a solid shaft of the same material and the same outside diameter is
A
$$15/16$$
B
$$3/4$$
C
$$1/2$$
D
$$1/16$$
4
GATE ME 1993
+1
-0.3
The yield strength of a steel shaft is twice its endurance limit. Which of the following torque fluctuations represent the most critical situation according to Soderberg criterion?
A
$$-T$$ to $$+T$$
B
$$-T/2$$ to $$+T$$
C
$$0$$ to $$+T$$
D
$$+T/2$$ to $$+T$$
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