Section 12
1. Piston’s compression springs are designed:
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Not to allow the lubrication oil to reach the combustion chamber.
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Not to allow combustion gases to escape to the crankcase.
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To lubricate the piston-cylinder surfaces.
2. The braking system with compressed air (air brakes) is used in buses, because:
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The external wear of the piping and the other mechanisms of the air brakes is rare.
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The hydraulic braking system does not suffice for slowing down the vehicle.
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Vehicle driving is more comfortable.
3. In a four-stroke diesel-engine, when the crankshaft completes two revolutions, how many revolutions does the camshaft perform:
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Four revolutions.
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Two revolutions.
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One revolution.
4. The centrifugal pump of the water of the cooling system is driven by:
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The camshaft through a belt.
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The crankshaft through a belt.
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The camshaft with special gears.
5. The lubrication of engine bearing surfaces of modern cars is performed:
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By compulsory oil circulation.
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By a mixed system.
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By oil injection.
6. The hydraulic steering system is used in buses so as to:
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Reduce the effect of driver’s muscular effort at turning.
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Increase the effect of driver’s muscular effort at turning.
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Increase tyre grip on the road.
7. The air compressor:
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Sucks the air, compresses and introduces it into the air containers.
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Sucks the air and sends it to the suspension system.
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Sucks the air and sends it to the cooling system.
8. The servo-brake with compressed air applies to:
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A hydro-pneumatic braking system.
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An electrical braking system.
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A mechanical braking system.
9. The oil springs are designed:
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To lubricate the distributor.
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Not to allow the lubrication oil to reach the combustion chamber.
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Not to allow the combustion gases to escape to the crankcase.
10. The shock absorbers (amortisseur) are mechanisms which:
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Connect car frame with the tyres.
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Make car’s driving stable.
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Control and absorb fast the springs’ oscillations when the wheels meet a roughness on the road.
RESULT
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