WorksheetsFuel Types, Reaction Time, and Stopping Distance Worksheet
Total questions: 100
Worksheet time: 50mins
Which of the following is considered an alternative gaseous fuel?
Biodiesel.
Biomass.
Hydrogen.
Which of the following fuels is fossil?
Bioethanol.
Vegetable oil.
Gas oil.
Which of the following fuel has the highest knock resistance (octane number) of the following?
For gas oil.
Biodiesel.
Natural gas.
Which of the following fuels has the lowest environmental pollution?
Biodiesel.
Hydrogen.
Diesel oil.
Determine the distance travelled by a car at 80 km/h in 1 second using the formula you have learned to approximate the distance travelled in the reaction time!
Approximately 16 meters.
Approximately 24 meters.
Approximately 29 meters.
Determine the distance travelled in 1 second by a lorry travelling at 70 km/h using the formula for approximating the distance travelled in reaction time!
49 meters.
38 meters.
21 meters.
The average driver's reaction time is ...
1.1 to 1.3 seconds.
0.1 to 0.2 seconds.
0.5 to 0.7 seconds.
What is the driver's reaction time when braking?
The time from the detection of the obstacle to the application of the brake pedal.
The time from when the brake pedal is depressed until the vehicle stops.
The time from when the obstacle is detected until the vehicle stops.
Which of the following is the correct relationship between distance travelled during the reaction time, braking distance and stopping distance?
The distance traveled during the reaction time (thinking distance) is the difference between the stopping distance and the braking distance.
The stopping distance is the product of the stopping distance and the distance traveled during the reaction time.
The stopping distance is the quotient of the stopping distance and the distance traveled during the reaction time.
What is the vehicle's braking distance when braking?
Distance traveled between obstacle detection and brake pedal contact.
Distance traveled from brake pedal pressure until the vehicle stops.
Distance travelled from the moment the obstacle is detected until the vehicle stops.
How does the engine apply the braking effect when the engine is braking?
By the internal resistance of the engine.
By the increased engine suction.
By closing the intake manifold and switching off the ignition.
The exhaust brake increases braking efficiency during engine braking by...
The exhaust valves are not opened by the camshaft.
The exhaust pipe is closed by a throttle valve.
The exhaust pipe is opened by a throttle valve.
If the driver applies the exhaust brake while driving, the fuel in the engine...
does not enter.
only in the amount corresponding to the engine speed.
only in the amount corresponding to the idling speed.
What are the directional forces between the wheel and the ground when braking a vehicle in a straight line?
Both directional and lateral forces.
Forward-moving forces.
Lateral forces.
Which of the following factors affects the magnitude of climb resistance?
The mass of the vehicle.
Tyre pressure.
The speed of the vehicle.
Can the value of the climb resistance be affected by modifying the tyre pressure?
No.
Yes.
When the brake pedal is depressed quickly and fully once the pressure drop in the service air reservoir of a normal high-pressure air brake is not more than...
0.7 bar.
0.2 bar.
0.4 bar.
The air brake system shall be properly sealed if after filling the air reservoir and stopping the engine, the air pressure drop is not more than...
0.5 bar for 10 minutes.
0.1 bar for 10 minutes.
0.3 bar for 10 minutes.
The empty air reservoirs of the lorry are pressurized to 5 bar (at medium engine speed)...
in about 6 minutes.
in about 1 minute.
in about 3 minutes.
Which of the following factors affects the amount of the acceleration on a lorry?
Truck speed before acceleration.
The weight of the lorry.
The speed to which you want to accelerate the truck.
Which of the following influences the magnitude of the acceleration resistance?
The speed at which we wish to accelerate the vehicle.
Vehicle speed before acceleration.
Rate of acceleration.
During a long journey the air pressure in the heated tyres rise. Do you need to reset the tire pressure to the factory recommended value?
No.
Yes.
Only when traveling at high speed.
Does the technical condition of the lorry influence the fuel consumption of the engine?
No only the driving safety.
Yes to a large extent.
Only theoretically because the magnitude of the change in consumption cannot be detected during operation.
Which is the most economical way of operation a diesel engine today?
When the accelerator pedal is not pressed hard and the engine speed is approx. one third (approx. 800 / min).
When the accelerator is depressed between 80% and 90% during acceleration and the engine speed is rated speed approx. 50-60% (about 1000-1100 / min).
When operating the engine at low throttle at rated speed (approx. 2300 rpm).
Generally where is the engine power higher of the following?
Near the lowest engine speed.
At the lower end of the medium speed range.
At the upper end of the medium speed range.
At what engine speed is the specific fuel consumption of the engine most favourable?
At which speed the engine can deliver the maximum power.
Always at higher engine speeds than the speed at which the engine has the highest output.
Always at a lower engine speed than at which the engine is at its maximum power output.
In general where is the specific fuel consumption of the engine the most favourable?
At the lowest possible engine speed (where the engine is still not jerking).
Near half the maximum permissible engine speed.
Near the maximum permissible speed.
Which of the following statements about the engine's economical speed range is true?
It is always advisable to run the engine at its maximum power because the specific fuel consumption of the engine and the average fuel consumption will be as good as possible.
It is advisable to use maximum power where the time factor is more important than the best fuel consumption (overtaking, continuous traffic on the motorway etc.).
The engine's economical rev range should never be exceeded.
Is there a connection between car maintenance and economical operation?
No. Consumption can only be influenced by the driver's driving style and the vehicle maintenance is only relevant to the market image of the company.
Yes, there is. Economical operation of a vehicle cannot be achieved without regular maintenance.
Yes, there is. Economical operation of a vehicle cannot be achieved without regular maintenance.
Which of the following statements is correct?
The most favourable specific fuel consumption is always the lower engine speed at which the engine power is the highest.
The specific fuel consumption is best at the engine speed at which the engine is running at its maximum power.
Tractive force is inversely proportional to engine power.
The engine of a car with catalytic converter...
Provides much higher performance than an engine without a catalytic converter.
It pollutes the environment less than an engine without a catalytic converter.
Has a much longer life than without catalytic converter.
What is the unit of average fuel consumption in Hungary?
100 km / liter.
Liters / 100 km.
Liters / km.
Which of the following is the abbreviation of the security device ASR?
Electronic Stability Program.
Anti-lock braking system.
Traction control equipment.
Which of the following is the ESP safety device?
Prevents the driven wheels from spinning or rotating at different speeds without a mechanical differential lock. If the engine torque is too high, it reduces to achieve optimum traction.
With the help of an electronic stabilisation program it recognises critical situations when cornering and prevents the vehicle from overturning.
When cornering to reduce and prevent any outward drift it may detect it controls the engine speed and operates the different wheel brakes differently as necessary.
Which security equipment is abbreviated as ESP?
Electronic Stability Program.
Anti-Block device.
Traction control equipment.
Which of the following is the ROP safety device?
Prevents the driven wheels from spinning. If the engine torque is too high it reduces it to achieve optimum traction.
In a curve it calculates the safe lateral acceleration value based on the speed, steering characteristics and mass of the vehicle and reduces the speed by intervention of the engine and braking system as necessary.
Detects critical situations, prevents derailment and vehicle breakout in a curve, by means of an electronic stabilization programme.
What should I do if the wheels slip and the lorry starts to swerve when braking?
The braking force shall be increased and the steering wheel position should be maintained to prevent the for the steering wheel termination.
The braking force shall be increased and counter-steering shall be used to stop swerving.
The braking force shall be reduced and counter-steering shall be used to eliminate swerving / fishtailing.
Which of the following could be the cause of the truck overturning?
Intensive braking on the highway.
Strong high acceleration while driving on an incline.
A sudden steering movement at high speed.
Which way is the centrifugal force pushing the vehicle on a curve?
Towards the inside edge of the curve.
Always towards the halfway line of the carriageway.
Towards the outer edge of the curve.
What are the directions of the forces acting on a lorry travelling in the curve of a bend?
Only forces acting in the direction of travel (called orbital forces).
Lateral forces only.
Both forces acting in the direction of travel (momentary) and lateral forces.
Which of the following is a modern safety device that counteracts oversteering by applying braking force to the front wheel on the outside curve of the bend?
The ASR.
The ESP.
The BAS.
In general, what should a driver be aware of when cornering on the highway if the vehicle is nose heavy?
Due to the slight creep of the front wheels the car steers towards the inside of the bend. (track 2).
The greater creep of the front wheels causes the car to steer towards the outside of the bend. (track 1).
The greater creep of the rear wheels causes the car to steer towards the inside of the bend. (track 2).
In general what should a driver expect on the highway when cornering if the car is rear heavy?
Due to the increased slip of the rear wheels the car steers towards the outside of the bend (track 1).
Due to a higher degree of rear wheel slip the car steers towards the inside of the bend (track 2).
The greater front wheel creep causes the vehicle to steer towards the inside of the bend (track 2).
What is the average fuel consumption of an engine?
Cost of operating the car per hour.
Amount of fuel consumed by the vehicle during a daily driving period.
The proportion of fuel used per 100 km of driving.
Does the fuel consumption of the engine depend on the speed of the truck?
Yes.
No.
Only when traveling at speeds above 100 km/h.
How is the average consumption of an engine calculated?
Determine the fuel consumption of the vehicle in liters for a certain distance (preferably several hundred of kilometers) and divide this value by the number of kilometers travelled.
Calculate the arithmetic average of the average fuel consumption under different conditions (empty/loaded vehicle, flat terrain/uphill).
Calculate the fuel consumption of the vehicle in liters for a certain distance (preferably several hundred of kilometers) and divide this value by the number of kilometers driven per 100 kilometers.
How is the specific fuel consumption of a car engine determined?
The engine shall be operated at maximum speed for one hour.
Based on average consumption measured in road traffic.
By engine diagnostic measurements.
From the figure determine the lowest specific fuel consumption at engine speed.
1000 rpm.
1800 rpm.
1500 rpm.
In general where is the engine power higher of the following?
Near the lowest engine speed.
The power of the engine is independent of its speed, it depends only on the amount of pressure on the accelerator pedal.
At the upper end of the medium rev range.
Where to use the lorry's maximum engine power?
Where the time factor plays a more important role than the most favorable consumption (overtaking, accelerator, joining a highway, etc.).
When driving on the highway to keep up with the fast pace dictated by cars and motorcycles.
On a lightly trafficked road sections in good road and visibility conditions to reduce the specific fuel consumption and average fuel consumption.
Choose the correct one from the statements concerning engine performance.
Engine power first decreases and then increases as the engine speed increases.
The engine power increases for a while as the engine speed increases then at a certain speed decreases.
The engine power increases gradually as the engine speed increases.
What color plaque is placed on the license plate of a modern environmentally friendly car at the environmental test?
Under the current regulations, such a plaque is no longer placed on the number plate.
Black.
Red.
Why should the service braking system of a lorry not be operated for a prolonged period of time when driving down a long slope?
Because of the increased stress on the air brake system means that the compressor must be charged much more frequently and this can lead to premature wear and tear.
Because the increased stress will cause the brake pads and brake shoes to wear out quickly.
Because the wheel brake assemblies heat up too much and the braking effect is greatly reduced.
When braking what is the braking delay time of the braking system?
The time elapsed between the detection of an obstacle and the application of the brake pedal.
Time elapsed from the moment the brake pedal is depressed until the braking effect is produced.
Time elapsed from the time the obstacle is detected until the braking effect is applied.
Which of the following is an advanced safety device that counteracts oversteer by applying braking force to the front wheel on the outside curve of the bend?
ASR.
ABAS.
ESP.
What is the role of the EGR valve?
It controls the amount of exhaust gas recirculated to the engine.
It prevents overpressure in the air brake system.
It prevents overcharging the alternator.
Which of the following statements is true for a hybrid drive?
Hybrid drive is the conventional propulsion of so-called amphibious vehicles that can travel on both water and land.
The hybrid drive has at least two different drive modes, e.g. internal combustion engine and electric motor.
Hybrid drive with two types of gas e.g. means a combination of biogas and hydrogen propulsion.
How does the speed of the vehicle affect the stress on the shock absorbers (dampers)?
The speed of the vehicle does not affect the use of the shock absorbers.
On potholed roads the stress on the dampers is reduced at lower speeds.
The demand on the shock absorbers decreases at higher speeds on potholed roads.
What does the length of the braking distance depend on?
The braking distance depend on the speed, the weight of the vehicle, the traction coefficient and the angle of the slope. (Do not depend on the reactions-time!!)
The braking distance depend only on the speed, the weight of the vehicle and the angle of the gradient.
The stopping distance depends on the speed, the vehicle mass, the grip coefficient, the possible slope angle and the driver's reaction time.
What does the length of the braking distance NOT depend on?
The grip factor.
The speed of the vehicle.
The reaction time of the driver.
Which of the following values does NOT change when driving at different speeds?
The reaction time of the driver.
The distance traveled during the reaction time.
The right following distance.
What affect the nodding movement or lateral tilt of the vehicle?
The height of the center of gravity.
The width of the weight line.
The torque of the engine.
When cornering, which way can an unsecured load move?
Towards the center of the turning radius.
It can move towards the outer curve of the bend.
It can move towards the inner curve of the bend.
What should you do if you notice that the vehicle is understeering?
Reduce the speed of the vehicle by throttle release, braking if necessary.
Reduce the vehicle's speed by braking suddenly and then accelerate to straighten the vehicle.
Increase the speed of the vehicle by sudden release of the accelerator.
Finish the sentence: If the load on one of the axles of the lorry significantly increases (eg. when driving down a slope) the load on the wheels on that axle...
is reduced.
does not change.
also increases.
If the load is not properly secured in which direction does it tend to move when decelerating?
It will not move.
In the same direction as the direction of travel, forward.
In the opposite direction to the direction of travel.
Which statement is true?
When cornering the unsecured load may move towards the outside curve of the bend.
When cornering the unsecured load may move towards the center of the bend.
When cornering the unsecured load may move towards the inner curve of the bend.
If the car is rearheavy then...
may become oversteered.
may become upsteered.
may become understeered.
If the car is noseheavy it...
may become oversteered.
may become upsteered.
may become understeered.
Which of the following is the correct definition of acceleration?
The change in velocity over a unit time.
The change in position during a unit time.
The time required for a unit change in velocity.
How does the centrifugal force change on a bus during cornering?
The centrifugal force varies in direct proportion to the square of the velocity and in inverse proportion to the turning radius.
The centrifugal force varies in direct proportion to speed and turning radius.
The centrifugal force varies in inverse proportion to the velocity and the turning radius.
Is there a connection between the rolling resistance of the wheels and the profile of the tires?
Only when the daily average temperature is above 7 degrees Celsius.
Yes
Only for winter tires
What is the role of the dynamic brake force regulator?
It adjusts the braking force according to the axle load.
It adjusts the braking force according to the road surface conditions (dry, wet, snowy).
Prevent the driven wheels from spinning.
Is it recommended to drive permanently in the lower half of the engine speed range?
No, because it overloads the engine.
Yes, because it saves fuel.
No, because it only increases travel time.
Which of the following is a function of the elements of the transmission system?
It increases the torque provided by the internal combustion engine to overcome the running resistances that occurs.
Provide adequate traction between the wheel and the solid surface.
It absorbs energy from vibrations caused by unnecessary road irregularities and makes the ride more comfortable.
Which of the following is NOT a function of the transmission system elements?
Matches the narrow operating speed range of the internal combustion engine to the wide speed range of the vehicle.
Provide adequate traction between the wheel and the solid surface.
Allows the driven wheels to change direction of rotation.
Which of the following is a function of the components of the transmission system?
Match the narrow operating speed range of the internal combustion engine to the wide speed range of the vehicle.
It provides the proper deceleration and stopping of the vehicle.
It absorbs energy from vibrations caused by unnecessary road unevenness and makes traveling more comfortable.
Which is NOT one of the tasks of the transmission system elements?
Ensures proper deceleration and stopping of the vehicle.
Increases the torque provided by the internal combustion engine to overcome the rolling resistances that occur.
To provide a releasable connection between the engine and the driven wheels.
Which of the following is a component of the transmission system?
The shock absorber.
The service air brake.
The gearbox.
Which of the following is a part of the transmission system?
The differential.
The shock absorber.
The service air brake.
Which of the following is NOT the function of the safety valve in the air brake system?
Separation of air circuits with different functions and their associated reservoirs.
Provide the correct filling sequence.
To maintain the system pressure between two well-defined values.
When traveling downhill what equipment can be used to brake large vehicles for longer periods?
The parking brake device.
The service brake device.
The endurance brake device.
With the air reservoirs filled, what is the maximum air pressure drop allowed within 10 minutes after engine stop to qualify the air brake system as properly sealed?
0.1 bar
0.5 bar
0.4 bar
Why is the air braking system of a motor vehicle dual-circuit?
Because when one brake circuit fails the other is used to brake the vehicle.
Because one brake circuit is used to brake the front wheels of the vehicle and the other is used to brake the rear wheels.
Because the brake pressure generated in the two brake circuits may differ depending on axle load.
Does the hydraulic or the air brake system has a longer braking delay?
The brake delay time is almost the same in both cases.
The hydraulic brake system has a longer brake delay time.
The air brake system has a longer braking delay time.
How long does it take the compressor of the vehicle combination to fill up the empty air reservoirs?
6 minutes
9 minutes
3 minutes
If the rear wheels of your vehicle slip when braking, what should you do to prevent the vehicle from spinning?
The braking force must be reduced and counter-steering in the direction of the skid.
The braking force must be increased and counter-steering in the direction of the skid.
The braking force must be increased and counter-steering in the opposite direction of the breakout.
What should you do to keep the vehicle without ABS under control if the steered wheels skid (lock) during emergency braking?
The parking brake must be applied.
Must be braked with constant force.
The braking force must be reduced.
The vehicle's braking system is equipped with ABS. How should you brake to achieve full braking power if you are forced to apply emergency braking?
In the case of ABS intervention, the brake pedals must be released up to one-third of the pedal travel.
As soon as the ABS intervenes, the brake pedal must be released suddenly and than fully depressed again as fast as possible.
When the ABS is activated the brake pedal must also be depressed fully.
How does the amount of traction and braking force that can be transmitted to the ground vary between loaded and unloaded lorry?
The same in all cases.
In the case of a loaded vehicle, it is less than for an unloaded vehicle.
In the case of a loaded vehicle, it is bigger than for an unloaded vehicle.
When do the wheels of the vehicle block more easily?
If the air pressure of the vehicle's tires are on the prescribed value.
If the vehicle is running at full load.
If the vehicle is not loaded.
Which statement is true for ESP if the vehicle is understeered?
The ESP system prevents the vehicle from drifting by braking the rear wheel on the outside curve of the bend when the vehicle is understeered.
The ESP system prevents the vehicle from drifting by braking the rear wheel on the inside curve of the bend when the vehicle is understeered.
The ESP system prevents the vehicle from drifting by braking the front wheel on the inside curve of the bend when the vehicle is understeered.
Which statement is true for ESP if the vehicle is oversteered?
The ESP system prevents the vehicle from drifting by braking the front wheel on the inside curve of the bend when the vehicle is oversteering.
The ESP system prevents the vehicle from drifting by braking the rear wheel on the inside curve of the corner when the vehicle is being oversteered.
The ESP system prevents the vehicle from drifting by braking the front wheel on the outside curve of the corner when the vehicle is oversteering.
When is it NOT necessary to replace the seat belt?
If the belt is stretched.
After serious accidents.
After 5 years.
What is true of the dynamic stability control system, also known as the electronic stability program?
It combines the functions of the anti-block braking system and the traction control system.
This is another name of the anti-blocking braking system.
It intervenes into the transvers dynamics of the vehicle for stabilisation purposes.
Which of the following is an active safety device?
Endurance brake limiter.
Rear or side underrun protector.
Seat belt.
Which of the following is an active safety device?
Seat belt.
Brake assistant.
Airbags.
Which of the following is a passive safety device?
Rear or side underrun protector.
Tracking distance controller.
Endurance brake limiter.
Select the answer that describes the function of the ROP device.
Calculates the value of the lateral acceleration in a corner at which the vehicle is not yet overturned and if necessary, reduces the speed by reducing the engine torque and applying the brakes.
Prevents the drive wheels from spinning by restoring optimal traction.
If the system detects that the direction indicated by the driver with the steering wheel and pedals is not correct the ESP intervene and with the use of brakes it steers the vehicle back to the correct direction, thus preventing the vehicle from drifting out.
Which of the following statements is correct?
The flashing of the ABS indicator light when driving means the wheels may block during braking.
The pressure drop in fully filled air brake reservoir when the brake pedal is depressed once and fully must not exceed 0.3 bar.
The multiplication of the orbital and lateral forces gives the maximum force that can be transmitted to the road.
