Engine parts — Engineering, Mashit 30

16 questions on engine parts, from the Engineering exam of Mashit 30. Piston, crankshaft, valves and flywheel. Every question is shown with its correct answer, as in the official question pool.

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Questions on Engine parts

What can happen if the valve (tappet) clearance is too large? Noisy running and a loss of power.
What can too small a valve clearance cause? Burning of the exhaust valve.
What is the main function of the crankshaft counterweights? A centrifugal balancing force.
How does the engine's construction change as the number of cylinders increases? The flywheel becomes smaller in proportion to the number of cylinders.
What are the functions of the piston rings? To seal the gap between the piston and the cylinder.
What is the main function of the flywheel? To store momentum and keep the rpm steady between the strokes of the working cycle.
What are the main functions of the crankshaft? To convert linear motion into rotary motion.
Which mechanism operates (times) the valves? The camshaft.
What are the pistons and connecting rods of the engine connected to? To the crankshaft.
What is the function of the piston? To convert the combustion pressure into linear motion.
What is the function of the connecting rod? To connect the piston to the crankshaft.
What is connected to the two ends of the crankshaft? The gearbox, through the flywheel, at one end, and a belt pulley at the other.
Where is the air filter fitted on a diesel engine? On the inlet manifold.
What is the purpose of the "clearance" between the valves and the rocker arms? To allow for thermal expansion of the valve gear.
Why is the diameter of the piston smaller than the bore of the cylinder? To allow for thermal expansion.
What is the name of the lowest point the piston reaches during operation? Bottom dead centre.

Engine parts — Engineering, Mashit 30

Questions on Engine parts

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