1. Gas turbine engine fuel systems are very susceptible to the formation of ice in the fuel filters.

2. A fuel heater operates as a heat exchanger to warm the fuel.

Regarding the above statements,

Question

1. Gas turbine engine fuel systems are very susceptible to the formation of ice in the fuel filters.

2. A fuel heater operates as a heat exchanger to warm the fuel.

Regarding the above statements,

BlackTom AI · Accepted Answer

Fuel in gas-turbine systems often contains dissolved or free water that can precipitate and freeze, so statement 1 is correct.

1. Relevant knowledge points and concepts
- Jet fuel can hold dissolved water; under cooling or pressure/temperature changes, water separates as free droplets.
- Free water will freeze at 0°C and can form ice crystals or slush that collect on filter elements.
- Filters and low-flow, low-temperature regions (pressure drop across filter, fuel pump outlet, or high-altitude cold conditions) are prime locations for ice blockage.
- A fuel heater is a device that transfers heat into the fuel (i.e., a heat exchanger), commonly using engine bleed air, engine oil, or a fuel-to-fuel heat exchanger to raise fuel temperature and prevent ice formation.

2. Step-by-step reasoning
Step 1: Recognize that water in fuel can become free water when temperature/pressure change. Step 2: Free water will freeze at 0°C and form ice particles. Step 3: These ice particles tend to be trapped by fuel filters, causing restriction. Therefore the fuel system is susceptible to ice formation in the filters (supports statement 1). Step 4: Identify the function of a fuel heater — it warms the fuel by heat exchange with a hotter fluid (bleed air, oil, etc.). Step 5: By warming the fuel, the heater prevents water freezing and reduces viscosity problems (supports statement 2).

3. Intermediate steps (logical)
- Fuel contains water → temperature/pressure change → free water forms → temperature <= 0°C → ice forms → ice collects on filters → filter blockage.
- Heater couples fuel flow with a heat source → fuel temperature increases → prevents ice formation.

4. Why the correct answer is correct
Both statements describe established phenomena and equipment functions: fuel filters are indeed susceptible to ice blocking, and fuel heaters are implemented specifically as heat exchangers to warm fuel and mitigate that risk.

5. Why the other options are incorrect
- “Only No. 2 is true.” Incorrect because statement 1 is also true—the susceptibility of filters to ice is a real operational hazard.
- “Only No. 1 is true.” Incorrect because statement 2 is also true—the fuel heater does act as a heat exchanger to warm the fuel.

6. Conclusion
Both No. 1 and No. 2 are true, confirming the provided answer: both No. 1 and No. 2 are true.

1. Gas turbine engine fuel systems are very susceptible to the formation of ice in the fuel filters. 2. A fuel heater operates as a heat exchanger to warm the fuel. Regarding the above statements,单项选择题

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