Title: Unit 8 Quiz
Course: ENGY 111 Introduction to Biofuels > Section: ENGY 111 Introduction to Biofuels

Q: Gas engines can run on 100% ethanol.
- True
- False
A: True

Q: In terms of high octane and cetane numbers only, ethanol, methanol, and biodiesel are the best choices for transportation fuels.
- True
- False
A: True

Q: Methanol is less toxic than ethanol.
- True
- False
A: False

Q: Fuel cells directly convert chemical energy into work.
- True
- False
A: True

Q: The thermodynamic efficiency of fuel cells make them attractive for biomass power where fuel costs are relatively expensive compared to fossil fuels.
- True
- False
A: True

Q: A firetube boiler contains water to be converted to steam. The firetube passes through the center of the vessel and flue gas exits through smaller tubes.
- True
- False
A: True

Q: Which of the following are transportation fuels? (Check all correct responses)
- Gas
- Jet
- Diesel
- Water
A: Gas; Jet; Diesel

Q: Stirling cycle power systems are external combustion engines with modest efficiencies.
- True
- False
A: True

Q: Indirect-fired furnaces do not allow the products of combustion to come in direct contact with process streams.
- True
- False
A: True

Q: Jet fuel is used in gas turbines via Brayton cycle engines.
- True
- False
A: True

Q: Which boilers are better suited for direct combustion of biomass fuels?
- Fire-tube boilers
- Water-tube boilers
A: Water-tube boilers

Q: Otto and Diesel Cycles are internal combustion engines that are efficient on small scales.
- True
- False
A: True

Q: Direct-fired furnaces either burn fuel directly in the process stream, or the flue gas from combustion, is brought into contact with the process stream.
- True
- False
A: True

Q: All organic compounds of the modern world can be synthesized from the seven basic building blocks of the petrochemical industry. They are: syngas from methane, ethylene, propylene, butanes, butylene, butadiene, and BTX.
- True
- False
A: True

Q: Watertube boilers have a firebox that are surrounded by or penetrated by smaller tubes containing water. Fuel is burned in the firebox and heat is transmitted to the steam tubes.
- True
- False
A: True

Q: By combining power system cycles, an overall efficiency of 60% can be achieved.
- True
- False
A: True

Q: The Brayton Cycle power systems are the foundation of power generation.
- True
- False
A: False

Q: Vegetable oils are not potentially good fuels for diesel engines.
- True
- False
A: False

Q: In principle, all organic compounds can be synthesized from biorenewable resources.
- True
- False
A: True

Q: The Rankine Power cycle is able to directly burn coal and converts as much as 45% of its chemical energy to electricity.
- True
- False
A: True

Q: Gas is used for spark ignition of an Otto cycle engine.
- True
- False
A: True

Q: The Brayton Cycle power system expands gas through a turbine to create electricity.
- True
- False
A: True

Q: Transportation fuels are chemicals with sufficient energy densities and combustion characteristics to make them suitable for transportation vehicles.
- True
- False
A: True

Q: Ethanol burns cooler in the engine than gas and can produce higher power output and improved engine efficiency compared to gas.
- True
- False
A: True