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ISRO Mechanical Exam: Heat Transfer Quiz
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Question 1
A bar of Cu of length 75 cm and a steel bar of 125 cm length are joined together end to end. Both the bars are having same diameter of 2 cm. The free ends of the Cu and the steel bars are maintained at 100 °C and 0 °C respectively. The curved surfaces of the bars are thermally insulated, what is the approximate temperature at Cu- steel junction? (consider conductivity k of Cu = 400 
and k for steel 50 
)
and k for steel 50 ) Question 2
A hot liquid is kept in a big room, its temperature
is plotted as a function of time (t), which of the following curve may represent the plot?
is plotted as a function of time (t), which of the following curve may represent the plot? Question 3
In a heat exchanger, the hot liquid enters with a temperature of 180 °C and leaves at 160°C. The cooling fluid enters at 30 °C and leaves at 110 °C. The capacity ratio of the heat exchanger is
Question 4
Nu = CRemPrn represents heat transfer under
Question 5
The radiative heat transfer rate per unit area (W/m2) between two plane parallel grey surfaces (emissivity 0.9) maintained at 400 K and 300 K is (Stefan Boltzman constant σ= 5.67× 10–8 W/m2K4) _________.
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