A . In process heat exchangers, saturated steam is preferred over the superheated steam
B . The maximum is the emissive power of a surface at a temperature `T_1` occurs at a wavelength of `lambda_1`1. If the surface temperature is halved, the maximum in the emissive power would occur at a wavelength of 0.5 `lambda_1`
C . When a vertical plate is heated in infinite air environmental under natural convection conditions, the velocity profile in air, normal to the plate, exhibits a maximum.
D . A body at 925 K emits an energy of 1.42 x` 10^11``alpha`W/`m^2` (`alpha` is the Stefan-Boltzman constant) in the wavelength band between 3`mu`m to 4` mu`m. The fraction of this energy in the total energy emitted over the entire wavelength range is equal
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