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Gas Turbine Engines Chapter 25: Fuels - Ideal Requirements

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Gas Turbine Engines Chapter 25: Fuels - Ideal Requirements

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Questions and Answers

What is the primary cause of waxing in jet fuel?

Disruption of the fuel control unit

Increased vapor formation at high altitudes

Decreased fuel density due to temperature changes

Solidification of heavy hydrocarbons at low temperatures (correct)

Which of the following is the most effective way to minimize the effects of waxing in jet fuel?

Using a fuel heater in the engine's fuel system (correct)

Increasing the specific gravity of the fuel

Reducing the pressure on the fuel's surface during ascent

Installing fuel booster pumps inside the fuel tanks

What is the primary cause of fuel boiling in jet aircraft?

Solidification of heavy hydrocarbons at low temperatures

Disruption of the fuel control unit due to waxing

Increased vapor formation due to decreased pressure at high altitudes (correct)

Changes in the specific gravity of the fuel due to temperature variations

How do modern aircraft typically address the issue of fuel boiling?

By installing fuel booster pumps inside the fuel tanks Signup and view all the answers

How does the specific gravity (or density) of jet fuel affect engine performance?

Changes in fuel density directly impact the heat release from the fuel, affecting engine power output Signup and view all the answers

What is the primary purpose of adding fuel additives to jet fuel?

To prevent waxing and fuel boiling Signup and view all the answers

What is the primary difference between Jet A-1 and Jet B fuels?

Jet B is a wide-cut fuel, while Jet A-1 is a kerosene-based fuel Signup and view all the answers

How do changes in the specific gravity of jet fuel affect the overall weight of the aircraft?

Changes in fuel density can affect the overall weight of the aircraft, as the fuel is a significant component of the total weight Signup and view all the answers

What is the primary purpose of the fuel control unit in modern jet aircraft?

To automatically adjust for changes in fuel density, minimizing their impact on engine performance Signup and view all the answers

Which of the following is the most significant risk associated with the use of Jet B fuel in aircraft?

Decreased energy density resulting in reduced range and endurance Signup and view all the answers