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Section 17

1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. The servo-brake with compressed air applies to:
  • A hydro-pneumatic braking system.
  • An electrical braking system.
  • A mechanical braking system.
10. 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.
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