Principles of 4-Stroke and 2-Stroke Engines

What is the main function of an engine?

• To convert energy in fuel into heat

• To convert heat into mechanical energy

• To provide power for agricultural implements

• All of the above

What is the sequence of operations for a 4 stroke cycle petrol engine?

• Intake, Compression, Power, Exhaust

• Compression, Power, Exhaust, Intake

• Power, Exhaust, Intake, Compression

• Exhaust, Intake, Compression, Power

How many strokes does a 2-stroke engine complete in one revolution of the crankshaft?

• One

• Two

• Three

• Four

What is a key difference between 4-stroke and 2-stroke engines regarding power strokes?

• 4-stroke has one power stroke for every 2 revolutions

• 2-stroke has one power stroke for every 2 revolutions

• 4-stroke has one power stroke for every revolution

• 2-stroke has two power strokes for every revolution

What is the lubrication method used in a 2-stroke engine?

• Independent lubricating oil circuit

• Using fuel mixed with lubricating oil

What is the typical noise level of a 4-stroke engine during suction and exhaust?

• Noiseless

• Noisy

• Moderate

• Silent

Fill in the blank: A 2-stroke engine is usually more (a)   than a 4-stroke of equivalent size.