Section 13

1. The automatic pressure regulator is a mechanism of the braking system which:

Produces the required compressed air.
Distributes the air to more than one circuit.
Regulates automatically the pressure in the brake cylinders according to vehicle’s loading.

2. The centrifugal water pump of engine’s cooling system:

Sucks the cooling fluid from the radiator’s upper water space and sends it with natural flow to engine’s cylinder casings.
With the help of the thermostat it sucks the cooling fluid and sends it to cylinder casings.
Sucks the cooling fluid from the radiator’s lower water space and sends it with pressure to engine’s cylinder casings.

3. What is the aim of the exhaust brake?

4. In a bus fitted with a braking system with compressed air (air brakes), where should the driver direct their attention mainly?

5. Which of the following components are driven by the camshaft:

6. Which is the normal water circulation in the cooling system?

7. At least how many are the internal lighting circuits of a bus?

8. What does the oil manometer on dashboard of a bus show?

9. At least how many exterior rear-view mirrors should a bus have?

10. Which is the basic function of the differential?

To change driving direction by 40 degrees.
To differentiate the revolutions of one driving wheel from the other.
To increase the number of revolutions of the driving wheels in relation to those of the central driving shaft.

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