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What will be the heat flux across a flat board of thickness 40...

Q.  
What will be the heat flux across a flat board of thickness 40 mm and area 2 m2 if the temperature difference across its surfaces is 30°C. Assume that the thermal conductivity of the material is 0.095 W/mK.


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Answer :   Option: B


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Q.  
A mild steel ball of diameter 1.2 cm is initially at a temperature of 873 K and is exposed to air at 300 K. Find the time needed to cool the steel ball to 368 K. Assume that the convection heat transfer coefficient is 0.114 kW/m2 K. Also find the heat transfer rate after 120s.

A. 2.1 min, 3.9 W

B. 2.1 min, 8.9 W

C. 2.1 min, 4.9 W

D. 2.1 min, 5.9 W


Answer & Explanation

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Find the heat gain per hour by a 2 m long copper tube that is 1 cm in diameter carrying F12 at −30°C when exposed to still air at 40°C

A. 53 W

B. 54W

C. 58 W

D. 59 W


Answer & Explanation

Q.  
What should be the temperature difference across a slab of thickness 1 m, having a thermal conductivity 0.1 W/m K, in order to obtain a heat flux of 3 W/m2 ?

A. 0.38°C

B. 308°C

C. 380°C

D. 0.038°C


Answer & Explanation

Q.  
Steam at 373K is condensed over a cylindrical surface of diameter 25 mm maintained at 357 K, heat transfer coefficient is 10864 W/m2K, the rate of heat transfer per unit length of cylinder is

A. 16.35kW/m

B. 13.65kW/m

C. 12.56kW/m

D. 15.36kW/m


Answer & Explanation
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