Which of the following statement is wrong?

Question

Options:

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

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