1
GATE ME 2016 Set 3
MCQ (Single Correct Answer)
+1
-0.3
For a heat exchanger, $$\Delta {T_{\max }}$$ is the maximum temperature difference and $$\Delta {T_{\min }}$$ is the minimum temperature difference between the two fluids. $$LMTD$$ is the log mean temperature difference. $${C_{\min }}$$ and $${C_{\max }}$$ are the minimum and the maximum heat capacity rates. The maximum possible heat transfer $$\left( {{Q_{\max }}} \right)$$ between the two fluids is
A
$${C_{\min }}LMTD$$
B
$${C_{\min }}\Delta {T_{\max }}$$
C
$${C_{\max }}\Delta {T_{\max }}$$
D
$${C_{\max }}\Delta {T_{\min }}$$
2
GATE ME 2015 Set 3
MCQ (Single Correct Answer)
+1
-0.3
Saturated vapor is condensed to saturated liquid in a condenser. The heat capacity ratio is $${c_r} = {{{c_{\min }}} \over {{c_{\max }}}}.$$ The effectiveness $$(s)$$ of the condenser is.
A
$${{1 - \exp \left[ { - NTU\left( {1 + {C_r}} \right)} \right]} \over {1 + {C_r}}}$$
B
$${{1 - \exp \left[ { - NTU\left( {1 - {C_r}} \right)} \right]} \over {1 - {C_r}\,\exp \left[ { - NTU\left( {1 - {C_r}} \right)} \right]}}$$
C
$${{NTU} \over {1 + NTU}}$$
D
$$1 - \exp \left( { - NTU} \right)$$
3
GATE ME 2014 Set 2
MCQ (Single Correct Answer)
+1
-0.3
In a heat exchanger, it is observed that $$\Delta {T_1} = \Delta {T_2},$$ where $$\Delta {T_1}$$ is the temperature difference between the two single phase fluid streams at one end and $$\Delta {T_2}$$ is the temperature difference at the other end. This heat exchanger is
A
a condenser
B
an evaporator
C
a counter flow heat exchanger
D
a parallel flow heat exchanger
4
GATE ME 2011
MCQ (Single Correct Answer)
+1
-0.3
In a condenser of a power plant, the steam condenses at a temperature of $${60^ \circ }C.$$ The cooling water enters at $${30^ \circ }C$$ and leaves at $${45^ \circ }C.$$ The logarithmic mean temperature difference $$(LMTD)$$ of the condenser is
A
$${16.2^ \circ }C$$
B
$${21.6^ \circ }C$$
C
$${30^ \circ }C$$
D
$${37.5^ \circ }C$$
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