Which of the following statement is wrong?
A. The factor of evaporation for all boilers is always greater than unity
B. The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100°C
C. The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency
D. None of the above
Answer: Option D
Solution (By Examveda Team)
Option A: The factor of evaporation for all boilers is always greater than unityThis statement is correct. The factor of evaporation is a measure of how much water a boiler can evaporate under certain conditions compared to a baseline. It is always greater than unity because it takes into account the sensible heat added to the water before it reaches the boiling point.
Option B: The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100°C
This statement is correct. Equivalent evaporation is a standardized way to compare the performance of boilers, considering the evaporation of water at 100°C under standard atmospheric pressure.
Option C: The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency
This statement is correct. Boiler efficiency is a measure of how effectively the heat produced in the furnace is transferred into the water to generate steam.
Option D: None of the above
This is the correct answer because none of the statements A, B, or C are wrong.
This Question Belongs to Mechanical Engineering >> Steam Boilers, Engines, Nozzles And Turbines
B is the correct answer because the amount of water evaporated in kg per kg of fuel burnt is called evaporative capacity of boiler wheras the amount of water evaporated from and at 100°C into dry and saturated steam is called equivalent evaloration