Understanding Level 2 Engine Mechanics

Which component in a four-stroke petrol engine is responsible for opening and closing the engine’s valves at the correct time?

• Crankshaft

• Camshaft

• Flywheel

• Sump

What is the main function of the piston rings in an internal combustion engine?

• To transfer heat from the piston to the cylinder wall

• To seal the combustion chamber and control oil consumption

• To connect the piston to the crankshaft

• To regulate fuel flow

Which of the following is NOT a type of fuel commonly used in motor vehicle engines in Great Britain?

• Petrol

• Diesel

• Kerosene

• LPG

During which stroke of a four-stroke engine does the air-fuel mixture get compressed?

• Induction stroke

• Compression stroke

• Power stroke

• Exhaust stroke

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

• To inject fuel into the cylinder

• To ignite the air-fuel mixture

• To cool the combustion chamber

• To open the exhaust valve

Which engine component converts the up-and-down motion of the pistons into rotary motion?

• Camshaft

• Crankshaft

• Timing belt

• Rocker arm

A diesel engine differs from a petrol engine mainly because it:

• Uses spark plugs for ignition

• Compresses air only, then injects fuel

• Uses a carburettor to mix fuel and air

• Runs at a lower compression ratio

Which of the following is a likely cause of blue smoke coming from the exhaust of a petrol engine?

• Excess fuel in the mixture

• Burning engine oil

• Overheating coolant

• Faulty spark plug

What is the correct firing order for a typical four-cylinder in-line engine?

• 1-2-3-4

• 1-3-4-2

• 1-4-3-2

• 1-2-4-3

Which of the following best describes the function of the oil pump in an engine?

• To cool the engine

• To circulate oil to lubricate moving parts

• To filter the oil

• To increase engine power