53.
The interchange factor for radiation heat transfer from surface 'x' to surface 'y' in case of an infinite parallel planes with emis-sivities $${\varepsilon _{\text{x}}}$$ & $${\varepsilon _{\text{y}}}$$ is given by

58.
Solid angle subtended by the finite surface at the radiating element is

59.
Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called

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