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Section 12

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