1. A low temperature of the engine is noted. What may be the possible cause?
Small capacity of the radiator.
A power-cut of the fan.
A failure of the thermostat.
2. When the exhaust gases of the diesel engine are very dark, what is the possible cause?
Low temperature of the engine.
Low pressure of the cylinder.
Defective supply of the injection pump.
3. You ascertain that the diesel engine of your car presents interruptions. Which may be the possible cause of this?
Malfunction of the fuel injector.
Low temperature of the engine.
High temperature of the engine.
4. Why should you often check the normal pressure of the tyres of a lorry?
So as to prevent the wear of the car in general.
So as to prevent a premature wear of the tyres.
So as to have a comfortable driving.
5. When the starter motor (ignition) does not switch on, which is the possible cause of that?
The multiplier does not work properly.
The clearance of the electrical distributor contacts has not been adjusted properly.
The battery does not have the required voltage.
6. What is the aim of the exhaust brake?
Thrift in fuel consumption.
Reduction of the use of footbrake during movement of the vehicle on a downhill.
Relief of the engine.
7. Which is the normal water circulation in the cooling system?
Radiator - water jackets - water pump - thermostat -radiator.
Radiator - thermostat - water jackets - water pump -radiator.
Radiator - water pump - water jackets - thermostat -radiator.
8. What is the function of the gear-box in the transmission system?
Allows the progressive engagement with, and disengagement of the engine from the other parts of the system.
Alters the ratio between engine revolutions and driving shaft revolutions and consequently of the wheels.
It transfers the power of the pair mitre-wheel-crown wheel to the wheels allowing them to have different rotanion speeds.
9. What is the function of the primary shaft in the gear-box?
Through the central shaft and the joints, it drives the driving wheels.
Through the clutch it is driven by the engine.
It is driven by the central shaft and drives the secondary shaft.
10. The rev-counter of lorries has yellow, green and red scales (areas of revolution indications). Where should the pointer be when the performance of the engine is good and the fuel consumption is limited?
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