Which is a major advantage of a diesel engine over gaseous engines?

Which is a major advantage of a diesel engine over gaseous engines?

• A. High RPM capability
• B. Low emissions
• C. Increased fuel consumption
• D. Fuel efficiency

Answer: (D)

Fuel efficiency is the main advantage. Diesel engines use compression ignition with much higher compression ratios, which makes more of the fuel’s energy turn into useful work and boosts thermal efficiency. They also avoid throttling losses by letting air intake be near atmospheric pressure and controlling power by the amount of fuel injected, which reduces pumping losses. All of this leads to lower specific fuel consumption compared with engines running on gaseous fuels. High RPM capability is typically better in gasoline or some gaseous engines, and emissions and fuel use are not consistently better for diesel in every scenario, so the clear standout is the greater fuel efficiency.

Fuel efficiency is the main advantage. Diesel engines use compression ignition with much higher compression ratios, which makes more of the fuel’s energy turn into useful work and boosts thermal efficiency. They also avoid throttling losses by letting air intake be near atmospheric pressure and controlling power by the amount of fuel injected, which reduces pumping losses. All of this leads to lower specific fuel consumption compared with engines running on gaseous fuels. High RPM capability is typically better in gasoline or some gaseous engines, and emissions and fuel use are not consistently better for diesel in every scenario, so the clear standout is the greater fuel efficiency.