Final answer:
The strong liquor in the absorber will decrease with a decrease in evaporator load because this results in less refrigerant vapor being absorbed. Increased evaporator load would result in a stronger liquor because more vapor is absorbed, making option B the correct answer.
Step-by-step explanation:
When discussing the operation of an absorber in refrigeration or similar systems, various factors can affect the concentration, or 'strength,' of the absorbent, often referred to as the 'strong liquor'. The term 'strong liquor' refers to the concentrated solution coming out of the absorber, where it has absorbed the refrigerant vapor.
An expansion valve that is open too much, option A, would typically result in a lower refrigerant pressure and temperature in the evaporator and potentially a weaker solution in the absorber. Option B, a decrease in evaporator load, implies that less refrigerant is evaporated, and therefore, less vapor is available to be absorbed, also leading to a weaker liquor.
Conversely, Option C, an increase in evaporator load, means more refrigerant vapor is available to be absorbed by the solution in the absorber, thus making the liquor stronger. Finally, option D, having too much steam in the generator, would increase the temperature and pressure in the generator, driving the refrigerant from the strong solution and generating more vapor, potentially overpowering the absorbing capacity of the solution and making it weaker.
Based on these considerations, answer B is correct; the strong liquor in the absorber will decrease with a decrease in evaporator load, as it results in less refrigerant vapor being absorbed by the absorbent in the absorber. This process directly affects the solution's concentration by reducing the volume of refrigerant gas absorbed, thus diluting the liquor.