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What is the correct answer?

4

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