Understanding Petrol and Diesel Engines

What is the primary function of a spark plug in a petrol engine?

• To compress the air-fuel mixture

• To filter the engine oil

• To initiate the combustion process

• To cool down the engine

How does a diesel engine initiate combustion?

• Using a carburetor

• By electric heating elements

• Through high air compression

• Using a spark plug

Why do diesel engines typically have lower RPM limits compared to petrol engines?

• Lower air intake

• Higher combustion pressures

• Simpler engine design

• Lighter engine components

What role does the compression ratio play in engine efficiency?

• Higher ratios decrease efficiency

• No impact on efficiency

• Higher ratios increase efficiency

• Only affects petrol engines

What is the primary method by which diesel engines modulate power?

• Using different fuel types

• Controlling air intake with a throttle body

• Adjusting the fuel injection timing

• Varying the spark timing

What is a major reason for the higher initial cost of diesel vehicles?

• Lower demand for diesel

• Cheaper fuel costs

• Simpler engine technology

• Higher manufacturing complexity

How do modern diesel engines manage to reduce emissions effectively?

• Decreasing the compression ratio

• Through advanced emission control technologies

• Using simpler fuel

• By running at higher RPMs

Why might diesel engines be considered less fun to drive compared to petrol engines?

• They are less noisy

• They have a higher RPM range

• They offer a narrower power band

• They are lighter and faster