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Section 19

1. Engine air filter must be cleaned:
  • For the reduction of oil consumption.
  • For the better cleaning of the air.
  • For facilitating the suction of the normal air quantity without any obstacles.
2. When the diesel-engine emits excessive soot (smoke), what should you do?
  • Check and regulate the pump and fuel injectors and clean the air filter.
  • Change the lubrication oil.
  • Immediately repair the engine.
3. When the disengagement is difficult, what is the possible cause?
  • The disc is fixed on the flywheel.
  • The friction materials may have been overheated.
  • Oil or grease may exist in the friction materials.
4. What causes overheating of the engine?
  • Excessive fuel consumption.
  • Increase of the external temperature.
  • Malfunction of the thermostat.
5. You notice that the diesel engine of your lorry, while started, stops after a few revolutions. What may be the cause of this?
  • Obstruction of the feeding system.
  • Low compression of the cylinders.
  • Improper internal timing of the injection pump.
6. If your tyres of your car have a pressure higher than the normal, where will they present an increased wear?
  • On the middle (centre) of the tread.
  • Only on the internal side of the tread.
  • On the sides of the tread.
7. In a lorry that has a braking system with compressed air (air brakes), where should the driver direct his attention mainly?
  • To the indications of the manometers on the dashboard.
  • The way the footbrake pedal goes down, when pressed.
  • To the way the brakes act.
8. You notice that one air container of the braking system with compressed air (air brake) has holed. What should you do:
  • Ensure its immediate replacement.
  • Isolate it from the rest of the circuit.
  • Ensure its repair through welding.
9. You notice that in the exhaust gases of a diesel engine there is a white fume. What is the possible cause of this?
  • Great oil consumption.
  • The diesel engine has been overheated.
  • Water has entered the cylinders.
10. What does it mean when the oil warning light on the dashboard is on during the movement of the car?
  • That lubrication is normal.
  • That the generator (dynamo) does not charge the battery.
  • That oil pressure is insufficient.
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