Understanding Gasoline and Diesel Engines

The video tutorial explains the operational cycles of gasoline and diesel engines, highlighting the differences in their admission, compression, combustion, and exhaust processes. It covers the role of valves, pistons, and the crankshaft in both engine types, and compares their compression ratios and temperatures. The tutorial also discusses the differences in force and expansion during combustion, as well as the control mechanisms for engine rotation and fuel injection.

What happens during the intake phase of a gasoline engine?

• The piston moves down, filling the chamber with an air-fuel mixture.

• The piston moves down, filling the chamber with air.

• The piston moves up, compressing the air-fuel mixture.

• The piston moves up, expelling exhaust gases.

In a diesel engine, what is the chamber filled with during the intake phase?

• Exhaust gases

• Air-fuel mixture

• Only air

• Only fuel

How is the intake process controlled in most gasoline engines?

• By a throttle valve connected to the accelerator pedal

• By a fuel injector

• By a turbocharger

• By a pressure sensor

What is the typical compression ratio range for a gasoline engine?

• Between 10 and 15 to 1

• Between 8 and 11 to 1

• Between 16 and 24 to 1

• Between 5 and 7 to 1

At what temperature can the compressed air in a diesel engine reach?

• 450º C

• 600º C

• 800º C

• 1000º C

What initiates the combustion in a gasoline engine?

• Heat from compressed air

• High pressure

• A spark from the spark plug

• Direct fuel injection

In a diesel engine, when is the fuel injected?

• During the intake phase

• During the compression phase

• During the exhaust phase

• During the explosion phase

How does the force of combustion differ between gasoline and diesel engines?

• Diesel engines have a weaker force.

• Gasoline engines have a longer-lasting force.

• Diesel engines have a more intense but shorter force.

• Gasoline engines have a more intense but shorter force.

What is the effect of the combustion force on the pistons in gasoline engines?

• It causes a longer piston stroke.

• It causes a shorter piston stroke.

• It has no effect on the piston stroke.

• It causes the piston to move sideways.

What controls the engine speed in a diesel engine?

• Turbocharger

• Fuel injector pump

• Exhaust valve

• Throttle valve