Steam Boilers and Engines MCQs

Which of the following statement is wrong ?

by
The factor of evaporation for all boilers is always greater than unity.
The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100° C.
The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency.
none of the above
✅ The correct answer is option D.

The power of a boiler may be defined as

by
the ratio of heat actually used in producing the steam to the heat liberated in the furnace
the amount of water evaporated or steam produced in kg per kg of fuel burnt
the amount of water evaporated from and at 100° C into dry and saturated steam
the evaporation of 15.653 kg of water per hour from and at 100° C
✅ The correct answer is option B.