MDE 5 Q3

Answer: A) Increased fuel consumption and reduced power output
Explanation: Low compression pressure in a four-stroke engine can lead to increased fuel consumption and reduced power output. This occurs because insufficient compression pressure results in incomplete combustion of the fuel-air mixture, leading to less efficient engine performance and higher fuel usage.

Answer: B) Improved power output and reduced exhaust emissions
Explanation: Advanced fuel injection, where the fuel is injected earlier in the engine cycle, can lead to improved power output and reduced exhaust emissions. This is because it allows for better mixing of fuel and air, leading to more complete combustion and enhanced engine efficiency.

Answer: A) Increased engine knocking and reduced power output
Explanation: Retarded fuel injection, where the fuel is injected later in the engine cycle, can lead to increased engine knocking and reduced power output. This is because the combustion process starts later, potentially causing incomplete combustion and higher pressure in the cylinder, which can result in knocking and decreased performance.