Agricultural/Bioengineering Renewable Energy 2

Question 1

Which anaerobic digestion product can be used directly as a vehicle fuel after upgrading to remove CO2?

Accepted Answer

Biogas (biomethane)

Answer

Biogas upgraded to remove CO2 and H2S becomes biomethane, which meets natural gas vehicle fuel standards.

Question 2

In a wind energy system for an agricultural operation, what is the purpose of a charge controller?

Accepted Answer

Prevents battery overcharging by regulating current flow

Answer

A charge controller regulates the voltage and current from the wind turbine to prevent battery damage from overcharging.

Question 3

A farm uses a micro-hydropower turbine. If flow rate doubles but head remains constant, how does power output change?

Accepted Answer

Power doubles

Answer

Hydropower is P = ρgQH, so doubling flow rate Q directly doubles power when head H is constant.

Question 4

Which feedstock produces the highest methane yield per unit of volatile solids in anaerobic digestion?

Accepted Answer

Fats and oils

Answer

Fats and oils yield approximately 1,000 L CH4/kg VS, the highest among common organic substrates.

Question 5

What does the term 'net metering' allow agricultural solar installations to do?

Accepted Answer

Sell excess electricity back to the grid and receive credit on utility bills

Answer

Net metering allows farms to export surplus solar generation to the grid and offset future electricity costs.

Agricultural/Bioengineering Practice Test