MDE 11 Q2

Correct Answer: C) By using a series of filter media that cause small water droplets to merge into larger droplets, which are then easily separated.

Explanation:
Coalescer filters use specialized filter media designed to coalesce, or combine, small water droplets in the fuel into larger droplets. Once the water droplets are large enough, they can be separated from the fuel more easily, typically settling out and being removed via a water separator.

Correct Answer: B) They are collected in a water separator and drained off.

Explanation:
After the water droplets coalesce into larger droplets, they are separated from the fuel. These larger water droplets are typically collected in a water separator, where they can be drained off to prevent them from entering the engine fuel system, which could cause damage or operational issues.

Correct Answer: B) To separate water from fuel by causing small water droplets to combine into larger droplets.

Explanation:
The primary function of a coalescer type filter is to separate water from fuel. It works by causing small water droplets dispersed in the fuel to coalesce (combine) into larger droplets, which can then be easily separated from the fuel. This is essential in preventing water contamination in the fuel, which can cause corrosion and other operational issues in a diesel engine.

Correct Answer: B) It is capable of removing both solid and water contaminants simultaneously.

Explanation:
A coalescer filter is designed to remove water from fuel, but many coalescer systems are also equipped with pre-filters that can remove solid contaminants as well. This dual-functionality makes them particularly useful in ensuring the cleanliness and quality of the fuel before it is used in the engine.