Biogas equipment includes, CHP Biogas burner/ boiler Battery pack All of the above Only a and b

To answer the question regarding biogas equipment, let's analyze the options presented:

1. CHP: Combined Heat and Power (CHP) systems are indeed part of biogas equipment since they generate electricity and useful heat from biogas.

2. Biogas burner/boiler: These are also essential components, as they utilize biogas for heating and energy production.

3. Battery pack: While battery packs can store energy, they are not specifically classified as biogas equipment in the traditional sense. They may be used in conjunction with biogas systems but are not a direct component of biogas production or utilization.

Given this analysis:

• "All of the above" suggests that every listed item is a biogas equipment component, which is incorrect because a battery pack is not specifically biogas equipment.

• "Only a and b" correctly identifies that only the CHP and biogas burner/boiler are integral parts of biogas equipment.

Final Answer

Only a and b.