Introduction to Aircraft Fuels

What is the basic equation for combustion?

• A) Fuel + Oxygen → Carbon Dioxide + Water + Energy

• B) Fuel + Water → Carbon Dioxide + Oxygen + Energy

• C) Fuel + Carbon Dioxide → Oxygen + Water + Energy

• D) Fuel + Energy → Carbon Dioxide + Water + Oxygen

Complete the following sentence: Combustion is a rapid chemical reaction between fuel and ____.

• Water

• Oxygen

• Carbon Dioxide

• Nitrogen

What is the ideal air-fuel ratio for stoichiometric combustion?

• 12.5:1

• 14.7:1

• 16.0:1

• 18.0:1

Fill in the blank: A too rich (excess fuel) or too lean (insufficient fuel) mixture can ______ efficiency.

• Increase

• Reduce

• Have no effect

What does a high Exhaust Gas Temperature (EGT) indicate?

• Proper fuel mixture

• Engine efficiency

• Improper fuel mixture or engine damage

• Low engine performance

Exhaust Gas Temperature (EGT) is a measure of the temperature of ________.

• engine oil

• engine exhaust gases

• engine coolant

• engine fuel

What does thermal efficiency measure?

• The speed of an engine

• How effectively an engine converts fuel energy into mechanical power

• The size of an engine

• The color of an engine

Higher thermal efficiency means better ______.

• fuel utilization

• engine size

• color of the engine

• engine noise

What is specific fuel consumption?

• Fuel consumed per unit of power output over time

• Power output per unit of fuel consumed

• Total fuel consumed during a flight

• Average speed of an aircraft.

Specific fuel consumption is important for determining ______.

• A) aircraft speed

• B) aircraft range and operating costs

• C) fuel type

• D) engine temperature