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Section 17

1. In a suspension system with air, what is the use of the high pressure circuit:
  • It supplies additional air to, and increases the pressure in the air springs, when the car is being loaded, so as to maintain it steady.
  • It maintains a steady pressure in the air springs.
  • It supplies air to the servo-mechanisms of the vehicle.
2. What is the aim of the central driving shaft, if the engine is at the front part and the driving wheels are at the rear part?
  • To transfer the motion to the front wheels.
  • To transfer the motion from the differential to the gear-box.
  • To transfer the torque from the gear-box to the driving wheels.
3. The braking system with compressed air (air brakes) is used in lorries, because:
  • Driving the vehicle becomes more comfortable.
  • The hydraulic braking system does not suffice for slowing down the vehicle.
  • The external wear of the piping system and of the other mechanisms of the air brakes is rare.
4. The hydraulic steering system is used in lorries so as to:
  • Reduce the effect of driver’s muscular effort at turning.
  • Increase the effect of driver’s muscular effort at turning.
  • Increase the tyre grip on the road.
5. If the braking effect is not the same on all wheels, there is a risk for the vehicle when moving on the road:
  • Only when the road has curves.
  • Always, because during braking the vehicle may swerve from the road.
  • Only when the road is slippery.
6. The air compressor:
  • Sucks air, compresses and introduces it into the air containers.
  • Sucks air and sends it to the cooling system.
  • Sucks air and sends it to the suspension system.
7. The centrifugal water pump of engine cooling system:
  • With the help of the thermostat it sucks the cooling fluid and sends it to the cylinder casings.
  • Sucks the cooling fluid from the upper water space of the radiator and sends it with natural flow to the cylinder casings of the engine.
  • Sucks the cooling fluid from the lower water space of the radiator and sends it with pressure to the cylinder casings of the engine.
8. The automatic pressure regulator is a mechanism of the braking system which:
  • Distributes the air to more than one circuit.
  • Produces the required compressed air.
  • Regulates automatically the pressure in the brake cylinders according to the loading of the vehicle.
9. The aim of the crankshaft is:
  • To convert with the help of the cranks the reciprocating motion of the piston into rotary motion.
  • To drive the piston.
  • To transfer the kinetic energy of the piston to the transmission system.
10. The servo-brake with compressed air applies to:
  • A hydro-pneumatic braking system.
  • An electrical braking system.
  • A mechanical braking system.
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