Chapter 7 of 9

Maintenance and repair

20 questions from the official bank with the right answer, in the order of the manual.

A test on this chapter Cards of this chapter

No. 1
A low temperature of the engine is noted. What may the possible cause be?
1. ADamage of the thermostat.
2. BPower-cut of the fan.
3. CSmall capacity of the radiator.
Right answer: A. An official question of the Ministry, in its official translation.
No. 4
In order to ensure traffic safety and prevent accidents, you should, among others:
1. AReplace the light bulb with others of better performance so as to secure their longest life.
2. BClean often the illuminating surfaces of the lights.
3. CCheck periodically the efficiency and functionality of the reserve lamps.
Right answer: B. An official question of the Ministry, in its official translation.
No. 8
In order to have a safe driving and prevent accidents, you should, among others:
1. AReplace the bulbs with others of higher wattage so as to improve lamps’ efficiency.
2. BLeave the lamp glass dusty so as to prevent their fading.
3. CCheck periodically the indicators’ function.
Right answer: C. An official question of the Ministry, in its official translation.
No. 12
The minimum tyre grooving at the guiding axels of the coaches is:
1. A1,6 mm.
2. B1,5 mm.
3. C2 mm.
Right answer: A. An official question of the Ministry, in its official translation.
No. 13
What does it mean when the oil warning light on the dashboard is on during the movement of the car?
1. AThat the generator (dynamo) does not charge the battery.
2. BThat lubrication is normal.
3. CThat oil pressure is insufficient.
Right answer: C. An official question of the Ministry, in its official translation.
No. 14
What should you periodically check so as to restrict fuel consumption?
1. AThe level of engine cooling fluid.
2. BTyre tread depth.
3. CTyre pressure.
Right answer: C. An official question of the Ministry, in its official translation.
No. 17
What causes the overheating of the wheel drums?
1. AMalfunction of the differential.
2. BIrregular tyre pressure.
3. CMalfunction of the shoe return springs.
Right answer: C. An official question of the Ministry, in its official translation.
No. 19
How often should the driver check the engine oil quantity?
1. ABefore setting out on a long journey.
2. BDaily.
3. CWhen the lamp of oil pressure is on.
Right answer: B. An official question of the Ministry, in its official translation.
No. 20
When the starter motor (ignition) does not switch on, which is the possible cause of that?
1. AThe belt is broken.
2. BThere is a power cut between battery and starter motor.
3. CThe multiplier does not work properly.
Right answer: B. An official question of the Ministry, in its official translation.
No. 23
When the diesel-engine emits soot (smoke), what should you do?
1. AChange the lubrication oil.
2. BImmediately repair the engine.
3. CCheck and regulate the pump and fuel injectors and clean the air filter.
Right answer: C. An official question of the Ministry, in its official translation.
No. 26
You notice that the diesel engine of your bus, while started, stops after a few revolutions. What may the cause of this be?
1. ALow compression of the cylinders.
2. BObstruction of the feeding system.
3. CImproper internal timing of the injection pump.
Right answer: B. An official question of the Ministry, in its official translation.
No. 28
When the feeding system is well adjusted, what is the cause of the blue fume from a diesel engine?
1. AThe driver drives at a high speed.
2. BThe engine does not have a normal ignition advance.
3. CThe engine consumes a lot of oil.
Right answer: C. An official question of the Ministry, in its official translation.
No. 32
If your car’s tyres have a pressure higher than the normal, where will they show an increased wear?
1. AOn the sides of the tread.
2. BOn the middle (centre) of the tread.
3. COnly on the internal side of the tread.
Right answer: B. An official question of the Ministry, in its official translation.
No. 35
You notice that the air container of the braking system with compressed air (air brake) has holed. What should you do:
1. AEnsure its repair through welding.
2. BIsolate it from the rest of the circuit.
3. CEnsure its immediate replacement.
Right answer: C. An official question of the Ministry, in its official translation.
No. 37
You ascertain that in the exhaust gases of a diesel engine there is a white fume. What is the possible cause of this?
1. AWater has entered the cylinders.
2. BThe diesel engine has been overheated.
3. CGreat oil consumption.
Right answer: A. An official question of the Ministry, in its official translation.
No. 38
The malfunctioning shock absorbers cause:
1. ASmaller lateral tilt of the vehicle on bends.
2. BAbnormal behaviour of the vehicle, especially on bends.
3. CIrregular function of the engine.
Right answer: B. An official question of the Ministry, in its official translation.
No. 39
The aim of the anti-freeze fluid pump in a braking system with compressed air is to:
1. AMaintain system’s pressure steady.
2. BFeed the system with compressed air, so that rates of higher and lower function pressure are maintained steady in the air containers.
3. CInject the compressed air with anti-freeze fluid, so that the various components do not freeze at very low temperatures
Right answer: C. An official question of the Ministry, in its official translation.
No. 40
For traffic safety it is useful to?
1. APump up the tyres at a pressure lower than that recommended by the manufacturer.
2. BCheck tyre pressure before the journey.
3. CDrive using the dipped headlights.
Right answer: B. An official question of the Ministry, in its official translation.
No. 42
Tyres’ grip on the road is affected by:
1. AThe increased number of engine revolutions.
2. BExternal temperature.
3. CTyre quality and pressure.
Right answer: C. An official question of the Ministry, in its official translation.
No. 43
What will happen, if the kingpin inclination is not regular?
1. AThe return of the steering-wheel will not be regular and the steering will not be stable.
2. BThere will be an early wear of the steering system.
3. CYou will not be able to turn the vehicle easily.
Right answer: A. An official question of the Ministry, in its official translation.

A low temperature of the engine is noted. What may the possible cause be?

In order to ensure traffic safety and prevent accidents, you should, among others:

In order to have a safe driving and prevent accidents, you should, among others:

The minimum tyre grooving at the guiding axels of the coaches is:

What does it mean when the oil warning light on the dashboard is on during the movement of the car?

What should you periodically check so as to restrict fuel consumption?

What causes the overheating of the wheel drums?

How often should the driver check the engine oil quantity?

When the starter motor (ignition) does not switch on, which is the possible cause of that?

When the diesel-engine emits soot (smoke), what should you do?

You notice that the diesel engine of your bus, while started, stops after a few revolutions. What may the cause of this be?

When the feeding system is well adjusted, what is the cause of the blue fume from a diesel engine?

If your car’s tyres have a pressure higher than the normal, where will they show an increased wear?

You notice that the air container of the braking system with compressed air (air brake) has holed. What should you do:

You ascertain that in the exhaust gases of a diesel engine there is a white fume. What is the possible cause of this?

The malfunctioning shock absorbers cause:

The aim of the anti-freeze fluid pump in a braking system with compressed air is to:

For traffic safety it is useful to?

Tyres’ grip on the road is affected by:

What will happen, if the kingpin inclination is not regular?