MDE 9 Q7

B) Decreased engine performance due to clogged injectors

Explanation: Solid contaminants can clog fuel injectors, which disrupts the normal fuel spray pattern and delivery. This leads to incomplete combustion, reduced engine performance, and potential operational issues.

B) They cause injector clogging and uneven fuel delivery

Explanation: Solid particles in the fuel can clog injectors, affecting their ability to deliver fuel properly. This results in uneven fuel delivery, which can cause poor engine performance, rough running, and reduced efficiency.

A) Microbial activity produces acids that can corrode metal components

Explanation: Some microbes produce acidic byproducts as they metabolize fuel. These acids can contribute to the corrosion of metal components in the fuel system, including tanks, pumps, and injectors. This corrosion can lead to equipment damage and reduced lifespan of the components.

B) It leads to clogging and reduced effectiveness of the filters

Explanation: Microbial growth produces biomass and sludge, which can clog fuel filters. This clogging reduces the effectiveness of the filters, impeding fuel flow and potentially leading to engine performance issues and filter maintenance problems.

B) Misfiring and rough engine operation due to clogged injectors

Explanation: Microbial contamination can cause sludge and biomass buildup, leading to clogged injectors. Clogged injectors disrupt the proper fuel spray pattern and delivery, causing misfiring and rough engine operation.

B) Misfiring and rough engine operation

Explanation: Water in the fuel can disrupt the combustion process, leading to incomplete burning of the fuel. This can cause misfiring, rough engine operation, and a decrease in overall engine performance.

B) Formation of sludge and growth of microbial biomass

Explanation: Microbial contamination in distillate fuel oil can lead to the formation of sludge and biomass. Microbes, such as bacteria and fungi, can grow in the presence of water and organic material in the fuel, creating a thick sludge that can clog fuel lines, filters, and other components.

B) They cause clogging and reduced efficiency of the filters

Explanation: Solid contaminants can accumulate in fuel filters, leading to clogging. This reduces the efficiency of the filters and impairs their ability to clean the fuel, which can result in decreased fuel flow and potential engine problems.

B) Corrosion and rusting of fuel system components

Explanation: Water in distillate fuel oil can cause corrosion and rusting of metal components in the fuel system, including tanks, pipes, and injectors. Water reacts with the metal parts and forms corrosive acids, which can damage the system over time.

B) It causes clogging and reduced efficiency of the filters

Explanation: Water in the fuel can cause microbial growth, leading to the formation of sludge and particulates. These contaminants can clog fuel filters, reducing their efficiency and potentially leading to fuel flow issues.

B) Corrosion and erosion of fuel system components

Explanation: Solid contaminants, such as dirt, rust, or metal particles, can cause physical damage to fuel system components. They can lead to corrosion and erosion of metal parts, such as fuel pumps, injectors, and lines, due to abrasive action and chemical reactions.

B) It causes injector clogging and uneven fuel delivery

Explanation: Water contamination can lead to the formation of sludge and corrosion products, which can clog injectors. This clogging disrupts the normal flow of fuel, causing uneven fuel delivery and impacting engine performance.