MEV351 Chapter 1

What are the two main types of internal combustion engines?

• Spark-ignition (petrol) engines and Compression-ignition (diesel) engines

• Electric engines and Hybrid engines

• Gasoline engines and Jet engines

• Steam engines and Wind engines

Explain the difference between 4 stroke and 2 stroke engines.

• 4 stroke engines require four strokes to complete the engine cycle, while 2 stroke engines only need two strokes.

• 4 stroke engines operate in reverse compared to 2 stroke engines.

• 2 stroke engines require two strokes to complete the engine cycle, while 4 stroke engines need three strokes.

• 4 stroke engines require four strokes to complete the engine cycle, while 3 stroke engines only need three strokes.

What are some characteristics of petrol engines?

• Higher power output, slower acceleration, higher torque compared to diesel engines, require glow plugs for ignition

• Lower power output, faster acceleration, lower torque compared to diesel engines, do not require spark plugs for ignition

• Lower power output, slower acceleration, higher torque compared to diesel engines, require spark plugs for ignition

• Higher power output, faster acceleration, lower torque compared to diesel engines, require spark plugs for ignition

What are some characteristics of diesel engines?

• Short lifespan, low fuel economy, unreliable

• High efficiency, durability, high torque, compression ignition

• Low efficiency, low torque, spark ignition

• Fragile, low compression, low power output

Explain the concept of cylinder bore in an engine.

• The cylinder bore is the diameter of the cylinder where the piston moves up and down.

• The cylinder bore is the length of the cylinder where the piston moves side to side.

• The cylinder bore is the volume of the cylinder where the air-fuel mixture is compressed.

• The cylinder bore is the temperature of the cylinder where combustion occurs.

Describe the working principle of 4 stroke engines.

• A 4-stroke engine operates on the principle of three distinct processes: intake, compression, and power.

• A 4-stroke engine operates on the principle of five distinct processes: intake, compression, power, exhaust, and ignition.

• A 4-stroke engine operates on the principle of four distinct processes: intake, compression, power, and exhaust.

• A 4-stroke engine operates on the principle of two distinct processes: intake and exhaust.

Describe the working principle of 2 stroke engines.

• 2-stroke engines complete the combustion cycle in three piston strokes: intake/compression, power/exhaust, and exhaust/intake.

• 2-stroke engines complete the combustion cycle in one piston stroke: intake/compression.

• 2-stroke engines complete the combustion cycle in four piston strokes: intake/compression, power/exhaust, exhaust/intake, and compression/power.

• 2-stroke engines complete the combustion cycle in two piston strokes: intake/compression and power/exhaust.

How many strokes are there in a 4 stroke engine?

• 2

• 4

• 8

• 6

Which type of engine is more fuel-efficient, petrol, or diesel?

• Diesel

• Hybrid

• Gasoline

• Electric

What is the purpose of the spark plug in a petrol engine?

• To reduce engine noise

• To cool down the engine

• To ignite the air-fuel mixture in the combustion chamber

• To increase fuel efficiency