They seal the piston rings to the cylinder liner

They control intake of air and exhaust of combustion gases

They lubricate the connecting rod and crankshaft

What role do valves play in the operation of a four-stroke diesel engine?

This test assesses knowledge of the main parts and terminology related to four-stroke and two-stroke internal combustion engines.

The lowest point the piston reaches in the cylinder

The highest point the piston reaches in the cylinder

The position of the crankshaft when at rest

What is the term 'top dead center' (TDC) referring to in an engine?

By dividing the clearance volume by the cylinder bore

By dividing the total cylinder volume by the clearance volume

By multiplying the stroke length by the piston speed

By subtracting the clearance volume from the swept volume

How is the compression ratio of an engine calculated?

Because diesel fuel is ignited by a spark plug

Because higher compression helps ignite the diesel fuel through compression ignition

Because diesel engines operate at lower temperatures

Because gasoline engines require higher compression for efficiency

Why do diesel engines generally have higher compression ratios compared to gasoline engines?

The total volume of the combustion chamber

The internal diameter of the cylinder where the piston moves

What does the term 'cylinder bore' refer to in an engine?

To transfer rotary motion to linear motion

To seal the space between the piston and cylinder liner and prevent gas leakage

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

To create a thin lubricating layer that prevents metal-to-metal contact and wear

To increase friction between piston rings and cylinder liner

What is the purpose of lubrication oil between the piston rings and the cylinder liner?

The wrist pin (gudgeon pin) and connecting rod (conrod)

What component connects the piston to the crankshaft?

To increase the engine's weight for stability

To convert the piston's linear motion into rotary motion

Why does the crankshaft have a 'weird' or 'squiggly' shape in an internal combustion engine?

The camshaft rotates at the same speed as the crankshaft

The camshaft rotates twice as fast as the crankshaft

The camshaft rotates at half the speed of the crankshaft

What is the difference in rotation speeds between the camshaft and the crankshaft in a four-stroke engine?

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