Combustion, volcanic eruptions, the sun, and long term wars

What is the main function of an internal combustion engine?

• To convert electric energy into kinetic energy

• To burn fuel externally to heat water

• To combust fuel inside a chamber to produce mechanical work

• To cool down air before it enters the combustion chamber

The Otto engine is best known for:

• Its continuous combustion process

• Its use in jet propulsion

• Being the basis for most gasoline-powered car engines

• Using hydrogen as its primary fuel

What distinguishes a Wankel rotary engine from a reciprocating piston engine?

• It uses pistons in a straight-line motion

• It has a higher fuel efficiency in all conditions

• It rotates a triangular rotor inside a chamber instead of using pistons

• It is only used in motorcycles

Which engine type operates on the principle of continuous combustion?

• Otto engine

• Diesel engine

• Gas turbine engine

• Reciprocating piston engine

A reciprocating piston engine generates power by:

• Allowing fuel to combust outside the engine body

• Using rotors instead of pistons

• Moving pistons back and forth inside cylinders

• Compressing air through turbines

What are hydrocarbons primarily made of?

• Carbon and hydrogen

• Hydrogen and sulfur

• Nitrogen and oxygen

• Methane and propane

Which of the following is a renewable fuel derived from plant or animal fats?

• Diesel

• Bioethanol

• Hydrogen

• Biodiesel

Which fuel is produced from fermented sugars and starches?

• Diesel

• Bioethanol

• Hydrogen

• ETBE

What is ETBE typically blended with to improve fuel performance?

• Hydrogen

• Diesel

• Gasoline

• Biodiesel

Which of the following fuels produces only water as a byproduct when combusted?

• Diesel

• Biodiesel

• Hydrogen

• Bioethanol