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ISRO ME 2019: Heat Transfer Booster Quiz 2
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Question 1
A wooden slab having thickness 5cm has its inner and outer surface temperatures at 40 
and 20 
respectively. The heat flux from the slab is 40 W/
. The thermal conductivity of wood is :
and 20 respectively. The heat flux from the slab is 40 W/. The thermal conductivity of wood is :
Question 2
Lumped system analysis of transient heat conduction situations is valid when the Biot number is
Question 3
A cylindrical uranium fuel rod of radius 5 mm in a nuclear reactor is generating heat at the rate of 4 × 107 W/m3 the rod is cooled by a liquid (convective heat transfer coefficient 1000 W/m2-K) at 25 °C. At steady state, the surface temperature (in K) of the rod is
Question 4
Which of the following is a wrong statement?
Question 5
For a transient heat conduction,
(1) In lumped body internal conductive resistance is infinity.
(2) Very high response from body for
.
(3) For good thermal response body should be large in size as possible.
(4) if conductive and convective resistance have equal significance, lumped heat capacity method fails .
Which of the statements are correct
(1) In lumped body internal conductive resistance is infinity.
(2) Very high response from body for
. (3) For good thermal response body should be large in size as possible.
(4) if conductive and convective resistance have equal significance, lumped heat capacity method fails .
Which of the statements are correct
Question 6
Air enters a counter-flow heat exchanger at 70 °C and leaves at 40 °C. Water enters at 30 °C and eaves at 50 °C. The LMTD in deg. C is
Question 7
A heat exchanger is used to cool down hot water for a process plant. The hot water of mass flow rate 0.035 kg/s enters at 370 ℃ and leaves at 300 ℃ while the cooling water of mass flowrate 0.027 kg/s enters at 270 ℃and 218 ℃. Take specific heat of both the fluids as 4087 J/kg℃.The fraction of heat loss through Heat exchanger is
Question 8
A solid sphere 1 of radius ‘r’ is placed inside a hollow, closed hemispherical surface 2 of radius ‘4r’. The shape factor F2-1 is
Question 9
Match Group A with Group B:
Question 10
The kinematic viscosity of a fluid flowing past a flat plate is 10-3m2/s. If the Prandtl number is 0.71, then the value of the thermal conductivity of the fluid.The fluid properties at 25°C is Cp= 1.2 kJ/kgK, ρ= 1.25kg/m3
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Oct 23ESE & GATE ME
