To answer this question, you need to understand the concept of steam generating capacity of a boiler.
The steam generating capacity of a boiler refers to the amount of steam that the boiler can produce in a given time period. It is typically expressed in terms of "equivalent evaporation."
Option A) kg/hr - This option is incorrect because it refers to the rate at which steam is produced, not the overall capacity of the boiler.
Option B) equivalent evaporation - This option is correct. "Equivalent evaporation" is a measure of the steam generating capacity of a boiler. It represents the amount of water that would be evaporated from and at 100°C into dry saturated steam under atmospheric pressure in a given time period. This measure allows for a standardized comparison of boiler capacities.
Option C) steam pressure - This option is incorrect because steam pressure is not a direct measure of the boiler's capacity. The capacity of a boiler is determined by factors such as the size and design of the boiler, not just the steam pressure it can produce.
Option D) equivalent steam rate - This option is incorrect because it does not accurately describe the capacity of a boiler. The term "equivalent steam rate" is not commonly used to express the steam generating capacity of a boiler.
The correct answer is B) equivalent evaporation. This option is correct because it accurately represents the measure of the boiler's steam generating capacity.