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GATE 2021: Heat-Transfer Rapid Quiz-1
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Question 1
The value of Biot number is very small (<0.01) when __________.
Question 2
The emissive power of a blackbody is P. If its absolute temperature is doubled, the emissive power becomes.
Question 3
A 50 cm diameter pipeline carries hot oil at 30oC and is exposed to a surrounding temperature of -20oC . A special 5cm thick power insulation surrounds the pipe and has a thermal conductivity of 7 × 10-3 W/m-oC, what will be the energy loss from the pipe per meter of length if the pipe is urrounded by a fluid having heat transfer coefficient h = 9 W/m2oC)
Question 4
A spherical shaped orange (k= 0.8W/m ºC) 50mm in diameter undergoes riping process and generates 6000W/ of energy. If external temperature of orange is 20 ºC, determine the maximum temperature ( ºC ) at the centre of orange.
Question 5
A rectangular very long fin 20 × 5 × 2 cm3 is attached to the body of an automobile engine of 320° C temperature & surrounding temperature 30° C. If the convective heat transfer coefficient of surrounding air to conductivity of material of fin is Then the temperature gradient at the base of fin in (k/cm).
Question 6
For the parallel flow heat exchange the effectiveness is 0.4 and capacity ratio is unity, then NTU is___.
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