1
GATE ME 2008
MCQ (Single Correct Answer)
+2
-0.6
The $$LMTD$$ of a counter flow heat exchanger is $${20^ \circ }C$$. The cold fluid enters at $${20^ \circ }C$$ and the hot fluid enters at $${100^ \circ }C$$. Mass flow rate of the cold fluid is twice that of the hot fluid. specific heat at constant pressure of the fluid is twice that of the cold fluid. The exit temperature of the cold fluid is
A
$${40^ \circ }C$$
B
$${60^ \circ }C$$
C
$${80^ \circ }C$$
D
can not be determined
2
GATE ME 2007
MCQ (Single Correct Answer)
+2
-0.6
In a counter flow heat exchanger, hot fluid enters at $${65^ \circ }C$$ and cold fluid leaves at $${30^ \circ }C.$$ mass flow rate of the hot fluid is $$1$$ $$Kg/s$$ and that of cold fluid is $$2$$ $$kg/s$$. Specific heat of the hot fluid is $$10$$ $$kgK$$ and that of cold fluid is $$5$$ $$kj/kgK.$$ The $$LMTD$$ for the heat ecchanger is
A
$$15$$
B
$$30$$
C
$$35$$
D
$$45$$
3
GATE ME 2005
MCQ (Single Correct Answer)
+2
-0.6
Hot oil is cooled from $${80^ \circ }C$$ to $${50^ \circ }C$$ in an oil cooler which uses air as the coolant. The air temperature rises from $${30^ \circ }C$$ to $${40^ \circ }C$$. the designer uses a $$LMTD$$ value of $${26^ \circ }C$$. the type of heat exchanger is
A
parallel flow
B
double pipe
C
counter flow
D
cross flow
4
GATE ME 2004
MCQ (Single Correct Answer)
+2
-0.6
In a condenser, water enters at $${30^ \circ }C$$ and flows at the rate $$1500$$ $$Kg/hr.$$ The condensing steam is at a temperature of $${120^ \circ }C$$ and cooling water leaves the condenser at $${80^ \circ }C$$. Specific heat of water is $$4.187 kJ/kg$$ $$K.$$ If the overall heat transfer coefficient is $$2000$$ $$W/{m^2}K,$$ the heat transfer area is
A
$$0.707{m^2}$$
B
$$7.07{m^2}$$
C
$$70.7{m^2}$$
D
$$141.4{m^2}$$
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Turbo Machinery
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