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Find the heat gain per hour by a 2 m long copper tube...

Q.  
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


Answer & Explanation

Answer :   Option: A


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More Questions Heat and Mass Transfer:

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

Q.  
The ratio of the total emissive power of the surface to the total emissive power of the black surface at the same temperature is

A. Emissive power

B. Emissivity

C. Absorptivity

D. None of these


Answer & Explanation

Q.  
A surface having the same value of the monochromatic hemispherical emissivity at all wavelength is a

A. Black body

B. Gray body

C. White Body

D. None of these


Answer & Explanation
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