Question 12Gas Turbine - 1st Asst/Chief

70% to pass

For the same amount of available power, how does a low speed two-stroke diesel engine compare to a recuperated gas turbine configuration?

AThe two-stroke diesel engine would burn more fuel and the particulate and nitrogen oxide (NOx) levels in the exhaust would be higher than that of a recuperated gas turbine configuration

BThe two-stroke diesel engine would burn less fuel and the nitrogen oxide (NOx) levels in the exhaust would be much lower than that of a recuperated gas turbine configuration.

CThe two-stroke diesel engine would burn more fuel than a recuperated gas turbine; however, the particulate and nitrogen oxide (NOx) levels in the exhaust would be lower.

DThe two-stroke diesel engine would burn less fuel than a recuperated gas turbine, however, the levels of particulate and nitrogen oxide (NOx) levels in the exhaust would be higher.

AI Explanation

The correct answer is D. The two-stroke diesel engine would burn less fuel than a recuperated gas turbine, however, the levels of particulate and nitrogen oxide (NOx) levels in the exhaust would be higher. This is because two-stroke diesel engines are generally more efficient in converting fuel to power compared to recuperated gas turbines. However, the combustion process in a two-stroke diesel engine produces higher levels of particulate matter and nitrogen oxides (NOx) emissions due to the high-pressure, high-temperature conditions in the engine cylinder. The other options are incorrect because A) is the opposite of the correct answer, B) suggests the two-stroke diesel would have lower NOx emissions which is not the case, and C) correctly identifies the fuel efficiency but incorrectly states the particulate and NOx levels would be lower.