Vehicles Maintenance Exam 1 اِگزیم

Yes, because accelerating causes an unnecessary use of fuel: Correct
Modern vehicles are designed to start without the need to press the accelerator. Pressing the accelerator while starting the engine wastes fuel and can place unnecessary strain on the engine. It is recommended to simply turn the key or press the start button to allow the engine to start efficiently.
No, unless the engine is diesel: Diesel engines, like petrol engines, do not require the accelerator to be pressed during startup in modern vehicles. Older diesel engines might have required priming or manual adjustments, but this is no longer the case with modern technology.
No, because the ignition circuit may malfunction: Starting the engine without accelerating does not cause the ignition circuit to malfunction. This statement is incorrect and misleading. Ignition systems are designed to work without any input from the accelerator.

The liquid that a battery contains is a mixture of distilled water and sulfuric acid. To replenish this liquid, we will only add distilled water because the sulfuric acid does not evaporate.

Yes, its adjustment, operation, and condition: Correct
The lighting system of a vehicle must be checked regularly to ensure that it is functioning correctly. This includes checking the adjustment (so that the lights are aimed properly), operation (ensuring all lights are working), and condition (checking for any damage or wear). Regular maintenance ensures the safety of the driver and others on the road, as proper lighting is crucial for visibility and signaling.
No: This is incorrect because regular checks of the lighting system are necessary for safety and compliance with traffic laws.
Yes, all wires and connections: While checking the wiring and connections is important, it is not the full extent of what needs to be checked for the lighting system. It is more important to also verify the adjustment, operation, and condition of the lights themselves.

To keep the braking system in optimum condition, we must check the level of the brake fluid periodically and check the state of the brake circuit, the tension of the step brake or the wear of the shoes or pads it contains.

Whenever you want to check the level of oil in the engine of a vehicle, it should always be done with the vehicle in a horizontal position and with the engine turned off and cold, because if you check while the engine is hot it can cause an error in your measurement, giving you an incorrect level.

Preventive maintenance consists of carrying out small care and maintenance tasks on our vehicle on a regular basis without having to wait for it to break down before going to the garage.

This preventive maintenance of the car is performed to ensure both the proper functioning of the car and to prevent traffic accidents caused by mechanical failures.

Most traffic accidents can be avoided if we consider all the risk factors: vehicle condition, physical condition of the driver or weather conditions for example. When an accident is caused by a mechanical failure, it’s in many cases avoidable if we keep a regular servicing and maintenance of the vehicle.

Cool the engine of the vehicle: Correct
The main function of coolant is to regulate the engine temperature. Coolant absorbs heat from the engine to prevent it from overheating and ensures it operates within a safe temperature range. Without sufficient cooling, the engine can become too hot, leading to potential damage or failure.
So that the vehicle has heating: This is incorrect. While coolant plays a role in the heating system, its primary function is to cool the engine. It is also used in the vehicle’s heater to provide warm air, but this is a secondary function.
So that the vehicle has air conditioning: This is incorrect. Coolant is not involved in the air conditioning system of the vehicle. The air conditioning system uses refrigerants, not coolant, to cool the air inside the cabin.

In the case of the vehicle’s risk factor, we can reduce it through periodic inspections and maintenance work on the vehicle, thus avoiding possible technical failures or breakdowns.

To clean the air that mixes with fuel: Correct
The air filter in a vehicle’s engine is responsible for cleaning the air that enters the engine. This air is essential for the combustion process, where it mixes with fuel to create energy. The filter removes dust, debris, and other contaminants from the air before it enters the engine, ensuring that the engine runs efficiently and preventing damage to the internal components.
To clean air in the heater: This is incorrect because the air filter is not specifically designed to clean the air in the heater; it focuses on the air that enters the engine for combustion.
To clean air cooling the engine: While the air filter plays a role in the overall engine performance, its primary function is not to clean air for cooling. The engine cooling system typically involves coolant fluids, not just air.

If you intend to take a drive where it is expected to rain, you should do some preventive maintenance of the vehicle, in particular, checking the condition of the tires and the windshield wipers. These should be monitored because they are responsible for removing rain from the windshield to improve the visibility of the road. You should also check the pressure and tread depth of your tires to ensure they are sufficient to maintain traction with the wet asphalt.

Checking the correct operation of our vehicle’s lights, headlights and signal lights at regular intervals is essential for safe driving. Never check each light separately but at regular intervals in pairs.

The periodic and frequent maintenance of the correct functioning of the different systems of a vehicle, such as the lighting system, steering or suspension, will be absolutely necessary as part of the preventive maintenance that we must do in our vehicle and in addition to the revisions established by the manufacturer.

Can reduce the probability of accident: Correct
Proper vehicle maintenance significantly reduces the likelihood of accidents by ensuring that critical systems like brakes, tires, steering, and lights are functioning correctly. Routine inspections and timely repairs help identify and address potential issues before they lead to failures. While maintenance cannot eliminate all risks (as external factors like road conditions and driver behavior also play a role), it greatly minimizes the chances of accidents caused by mechanical problems.
Eliminates the probability of accident: This is incorrect because no amount of maintenance can completely eliminate the possibility of an accident, as other factors (e.g., driver error, road conditions, weather) can still contribute.
Never reduces the probability of accident: This is incorrect because proper maintenance directly addresses potential vehicle-related failures, thereby reducing the risk of accidents caused by mechanical issues.

Aerodynamics and fuel consumption: Correct
The fairing of a motorcycle plays a significant role in its aerodynamics. It is designed to reduce air resistance, improve stability at high speeds, and optimize fuel efficiency. Changing the fairing, especially with one not designed for the specific motorcycle model, can disrupt these factors, leading to increased air drag and reduced fuel economy. It may also affect the handling of the motorcycle by altering its weight distribution and airflow dynamics.
Cosmetic only: This is incorrect because while fairing changes can alter the motorcycle’s appearance, they also have functional implications, particularly on aerodynamics and fuel consumption.
The visibility of the vehicle: This is incorrect because the fairing does not significantly affect how visible the motorcycle is to other road users. Visibility is more influenced by factors like lighting, reflective materials, and the rider’s behavior.

The braking distance is the distance covered by the vehicle from the time the driver starts to engage the brake pedal to the time the vehicle comes to a complete stop. This distance is affected by the mass of the vehicle, the load it is carrying and its placement, as well as the condition of the brakes, tires and shock absorbers. Therefore, we can say that the good or poor condition of the vehicle directly influences braking distance.

Driving with shock absorbers that are defective or in poor condition will increase the risk of having an accident for the driver and passengers of the vehicle. Also, it will increase the braking distance because there is no certainty that the wheels will be in constant contact with the roadway, you will experience instability when braking and uneven wear on the tires.

When we measure the oil level of our engine it is optimal that the car is cold and with the engine off. If it has been used before, it is advisable to wait at least five minutes with the engine off before taking the measurement. Burned oil can expand, which would give us an incorrect measurement of the actual condition of the engine.

Preventive maintenance consists of carrying out minor care and maintenance work on our vehicle on a regular basis without having to wait for it to break down before going to the repair shop. This preventive maintenance of the car is carried out to guarantee both the correct functioning of the car and to prevent traffic accidents caused by mechanical failures.

Yes: Correct
On a cross-town road with insufficient lighting, it is necessary to keep the low-beam headlights on. Low-beam headlights are designed to provide adequate illumination without blinding other drivers, making them suitable for roads with limited lighting. Using low-beam headlights helps ensure that you can see the road ahead while not creating a hazard for other road users, especially in dark or poorly lit areas.
No, low-beam headlights should only be used on well-lit cross-town roads: This is incorrect because low-beam headlights are specifically meant for low visibility situations, such as roads with insufficient lighting. They are not limited to well-lit roads.
No, you should use high-beam lights: This is incorrect because high-beam headlights are too bright for poorly lit or populated areas and can blind oncoming drivers or other road users.

When experiencing a lighting fault that necessitates the use of dipped lights, a driver must reduce their speed to ensure they can stop safely in a well-lit area. This precaution allows the driver to maintain visibility and control, preventing accidents and ensuring safety in low-visibility conditions.

All motor vehicles and mopeds driving between sunset and sunrise on poorly lit urban roads and cross-town roads are required to use their dipped or low-beam headlights.

The periodic review of the correct operation, adjustment and condition of the lighting system of a vehicle will be absolutely necessary as part of the preventive maintenance that we must do in our vehicle, and we will always check if the headlights illuminate in the right direction and with the correct intensity.

Vehicle lighting, as part of its active safety system, allows you to see where you are driving under poor lighting conditions on the road and allows you to discern potential hazards or obstacles with enough time to react and not collide with them. Also, lighting allows other drivers and road users to see you and determine your position on the road.

If, due to a malfunction of the appropriate lights while driving, you are forced to drive with lower intensity lighting, you are permitted to drive at night in these conditions provided to adjust your speed so that you can stop the vehicle within the illuminated distance.

Video Explanation

When a sensor detects a decrease in visibility: Correct
An automatic lighting system uses sensors to detect ambient light levels. When visibility decreases—such as in tunnels, at dusk, or during adverse weather—it automatically activates the headlights, ensuring adequate lighting without manual adjustment.
Starting at a certain time: It is incorrect. The system activates based on real-time visibility conditions, not a specific time of day like sunset.
When a sensor detects that the driver is fatigued: It is incorrect. Automatic lighting systems do not monitor driver fatigue. Fatigue detection systems are separate and focus on driver behavior, not lighting adjustments.

Dipped headlights (low beam lights) provide adequate visibility without causing glare for other drivers. If lighting conditions are uncertain—such as during dusk, dawn, fog, or heavy rain—turning on dipped headlights helps improve safety by making your vehicle visible to others.

The oil pressure warning light turns off when the engine is properly lubricated. When the oil is hot and circulating at the correct pressure, the system maintains proper lubrication, causing the warning light to remain off. If the warning light stays on, it indicates a problem with oil pressure, such as low oil levels or pump failure.

All citizens, directly or indirectly, Public Administrations and Insurance Companies, will assume the cost and expenses caused by traffic accidents, either in the form of fees, fines, taxes, toll charges, etc…