Heat Transfer - Study Mode
[#466] In forced circulation, the heating element is injected
Correct Answer
(A) Internally
[#467] In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid
Correct Answer
(A) Varies directly as the area and the LMTD
[#468] The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16 m is 10 W/m 2 . The temperature of the inside wall is -5°C. The outside wall temperature is
Correct Answer
(C) 35°C
[#469] The rate of heat transfer from a vertical plate by natural convection depends upon the temperature differences (ΔT) between wall and outside bulk. The proportionality is given as
Correct Answer
(D) $${left( {Delta { ext{T}}}
ight)^{frac{3}{4}}}$$
[#470] The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m 2 . The flux, when the element temperature is increased to 1000°C for the same furnace temperature is
Correct Answer
(D) 16.5 kW/m 2