Principles of 4-Stroke and 2-Stroke Engines

What is the main function of an engine?

• To convert energy in fuel into mechanical energy

• To create heat from fuel

• To control the speed of a tractor

• To compress air

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

• Both have the same power stroke frequency

• 4-stroke engines are more powerful

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

• Using fuel mixed with lubricating oil

• Independent lubricating oil circuit

• No lubrication needed

• Oil is not used

What is the construction complexity of a 4-stroke engine compared to a 2-stroke engine?

• Complicated and expensive

• Simple and cheap

• Equally complicated

• More efficient

What is the air tightness requirement of a crankcase in a 2-stroke engine?

• Must be sealed

• Unnecessary

• Can be partially sealed

• Depends on the model