Quiz on Petrol vs Diesel Engines

What is the first step in the four-stroke cycle of petrol and diesel engines?

• Compression stroke

• Intake stroke

• Power stroke

• Exhaust stroke

Which stroke in the four-stroke cycle involves compressing the air and fuel mixture?

• Exhaust stroke

• Power stroke

• Intake stroke

• Compression stroke

What is the purpose of the compression stroke in the four-stroke cycle?

• Intake air into the cylinder

• Push out exhaust gases

• Compress the air and fuel mixture

• Ignite the mixture

What is the self-ignition temperature related to in diesel engines?

• Compression

• Spark plug

• Fuel injection

• Exhaust valves

Why do diesel engines have higher compression ratios compared to petrol engines?

• To decrease fuel efficiency

• To limit thermal efficiency gains

• To reduce torque production

• To ensure ignition through compression

Why do diesel engines ignite the air and fuel mixture through compression?

• Higher self-ignition temperature

• Lower compression ratio

• Spark plug ignition

• Exhaust valve operation

How do petrol engines achieve engine braking?

• Throttle body closes

• Exhaust valve opens

• Fuel injectors increase supply

• Compression stroke occurs

What is the main difference in throttle body usage between diesel and petrol engines?

• Diesel engines lack a throttle body

• Petrol engines lack a throttle body

• Both engines use throttle bodies

• Throttle body size is different

How does engine braking occur in a diesel engine?

• By closing the throttle body

• By opening the exhaust valve

• During the compression stroke

• Through increased fuel supply

What differentiates engine braking in petrol and diesel vehicles?

• Fuel injector supply

• Throttle body operation

• Exhaust valve mechanism

• Compression stroke function