Discussion
In dryers, the ratio of latent heat of evaporation, to the total heat energy of the fuel charged is known as-
Answer: D
The ratio is the Thermal efficiency of the dryer.
Thermal efficiency compares the heat actually used to evaporate the moisture (the latent heat of evaporation of the water removed) with the total heat energy of the fuel charged. It shows how much of the fuel's energy goes into useful drying.
The heat utilization factor is the ratio of the temperature drop of the air in the dryer to the temperature rise from heating, a measure of how well the hot air is used. Coefficient of performance belongs to refrigerators and heat pumps, and 'effective heat utilization energy' is not a standard term.
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