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Operating Truck, Semi-Trailer
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1.What should you check before coupling a trailer to a semi-truck?
A clean, greased fifth wheel ensures smooth coupling and prevents wear. Always inspect for damage and ensure the lock jaws will secure the trailer kingpin.
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Operating Truck, Semi-Trailer
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2.What is the function of the trailer air supply valve?
The trailer air supply valve controls the trailer’s air brakes. When pushed in, it supplies air to release the brakes. When pulled out, it applies the spring brakes.
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Operating Truck, Semi-Trailer
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3.What is the correct way to test trailer service brakes?
Apply the foot brake while driving slowly forward. This ensures only the service brakes are tested, not the spring brakes or parking brakes.
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Operating Truck, Semi-Trailer
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4.When backing a semi-trailer, how should you steer?
Steering a semi-trailer is counterintuitiveu2014turning right makes the trailer go left. Practice in a safe area helps develop proper coordination during reverse maneuvers.
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Operating Truck, Semi-Trailer
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5.What should you do before descending a long steep hill in a truck?
Always shift into a lower gear before descending to use engine braking. This reduces the load on your service brakes and prevents overheating.
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Operating Truck, Semi-Trailer
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6.What is a common cause of jackknifing with semi-trailers?
When a trailer is lightly loaded or empty, sudden braking can cause the trailer to swing around the cab. Smooth, controlled braking prevents jackknifing.
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Operating Truck, Semi-Trailer
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7.How can you ensure trailer alignment when coupling?
Aligning the fifth wheel directly under the trailer kingpin ensures a secure coupling. Misalignment can damage the locking jaws or lead to unsafe connections.
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Operating Truck, Semi-Trailer
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8.What must you do after coupling the trailer to the tractor?
A tug test ensures the trailer is securely connected. Also visually inspect that the locking jaws are around the kingpin and the landing gear is up.
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Operating Truck, Semi-Trailer
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9.What is the risk of overloading a semi-truck?
Overloading affects handling, increases braking distance, and may cause tire failure or mechanical breakdowns. Always stay within legal axle weight limits.
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Operating Truck, Semi-Trailer
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10.When should you use your engine brakes in a truck?
Engine brakes help reduce speed without overusing the service brakes. Use them before or during long descents to control speed and avoid brake overheating.
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Operating Truck, Semi-Trailer
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11.What should you check in a walk-around inspection before driving?
The walk-around inspection ensures the truck and trailer are roadworthy. It includes checking brakes, tires, lights, leaks, coupling, and documentation.
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Operating Truck, Semi-Trailer
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12.What is the maximum legal height for commercial trucks in Kuwait?
The legal maximum height for commercial vehicles is generally around 4.1 meters in Kuwait. Exceeding this may result in fines or risk of hitting overpasses.
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Operating Truck, Semi-Trailer
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13.What must you do before backing a semi-trailer into a loading dock?
Always check the area before backing up a semi-trailer. Get out and look for obstacles, blind spots, or people. This reduces collision risk.
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Operating Truck, Semi-Trailer
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14.What is the primary danger of a semi-trailer jackknife?
Jackknifing occurs when the trailer swings out of alignment, leading to dangerous loss of control. It’s often caused by sudden braking or slippery roads.
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Operating Truck, Semi-Trailer
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15.How can you prevent a load from shifting in a semi-trailer?
Properly securing cargo with tie-downs, straps, and load bars prevents shifting, which can destabilize the trailer and lead to rollovers or accidents.
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Operating Truck, Semi-Trailer
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16.When should you use your engine brake (retarder)?
Engine brakes help slow the vehicle on long declines without overheating the service brakes. Avoid using them on slippery surfaces.
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Operating Truck, Semi-Trailer
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17.What is a “no-zone” in truck driving?
“No-zones” are blind spots where cars disappear from the truck driver’s view, especially along sides, rear, and front. Drivers must check carefully before changing lanes.
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Operating Truck, Semi-Trailer
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18.Why is it dangerous to coast downhill in neutral?
Coasting in neutral removes engine braking and reduces vehicle control. Use a low gear to maintain safe downhill speed and braking ability.
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Operating Truck, Semi-Trailer
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19.What should be checked before coupling a trailer?
Always inspect the fifth wheel, kingpin, and airlines. Ensure proper alignment, no debris, and that locking jaws close securely around the kingpin.
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Operating Truck, Semi-Trailer
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20.What is the purpose of sliding the fifth wheel?
Sliding the fifth wheel helps redistribute the trailer’s weight over the axles to comply with legal limits and improve handling or traction.
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Operating Truck, Semi-Trailer
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21.What is trailer “sway” and how can it be avoided?
Trailer sway refers to side-to-side motion, often caused by wind or poor loading. It can be reduced by proper weight distribution and avoiding sudden steering.
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Operating Truck, Semi-Trailer
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22.When descending a steep hill in a truck, what should you do?
Always shift to a lower gear before descending and apply engine brakes. This preserves service brakes and improves control on long or steep grades.
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Operating Truck, Semi-Trailer
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23.How often should you check mirrors while driving a semi-truck?
Frequent mirror checks allow you to stay aware of vehicles in blind spots and traffic changes, improving your ability to react safely to hazards.
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Operating Truck, Semi-Trailer
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24.Why should you avoid sudden lane changes in a large truck?
Large vehicles have wide blind spots and high centers of gravity. Sudden lane changes risk collisions or rollovers. Always signal and check all mirrors.
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Operating Truck, Semi-Trailer
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25.What is “off-tracking” in truck turns?
In turns, the rear wheels of a truck-trailer follow a shorter path than the front, called off-tracking. Drivers must swing wide enough to avoid curbs or obstacles.
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Operating Truck, Semi-Trailer
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26.What is the correct way to handle a tire blowout on a truck?
In case of a tire blowout, grip the wheel firmly, stay in your lane, and reduce speed gradually. Avoid hard braking to maintain control.
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Operating Truck, Semi-Trailer
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27.When coupling a semi-trailer, what should you check after connecting the airlines?
After connecting air lines, listen for leaks. Leaks may reduce braking power or cause total brake failure in air-brake systems.
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Operating Truck, Semi-Trailer
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28.How can you ensure safe cornering with a truck and trailer?
Slow down before turns and make wide turns to accommodate the trailer. This prevents hitting curbs or off-tracking into other lanes.
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Operating Truck, Semi-Trailer
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29.What must be done if your truck’s load is over legal weight limits?
Overweight trucks are illegal and unsafe. Either reduce the load or obtain an overweight permit approved by authorities.
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Operating Truck, Semi-Trailer
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30.How do you test trailer brakes after coupling?
Use the trailer hand valve to apply the brakes independently. Ensure they apply properly before driving. This prevents runaways.
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Operating Truck, Semi-Trailer
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31.What is the danger of driving a truck with worn-out tires?
Worn tires increase the risk of hydroplaning, loss of traction, and blowouts, especially under heavy loads. Regular tire checks are crucial.
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Operating Truck, Semi-Trailer
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32.Why should trucks avoid sudden downshifting on wet roads?
Abrupt downshifting on slippery roads can lock drive wheels, causing a skid. Shift smoothly and gradually to maintain control.
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Operating Truck, Semi-Trailer
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33.What is the best method to avoid fatigue on long hauls?
Fatigue impairs reaction time and judgment. Schedule rest breaks every few hours, and avoid driving for more than 11 hours in a day.
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Operating Truck, Semi-Trailer
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34.Why should you use your hazard lights on a slow-moving truck?
Hazard lights are used when traveling significantly slower than traffic, especially on hills, to alert drivers behind and avoid collisions.
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Operating Truck, Semi-Trailer
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35.What is the purpose of a “pre-trip inspection”?
A pre-trip inspection checks brakes, tires, lights, steering, and fluids. It prevents breakdowns and is required by law in commercial driving.
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Operating Truck, Semi-Trailer
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36.What should you do if a trailer starts to skid while braking?
If trailer wheels lock and skid, release the brakes to allow traction to return. Reapply gently to regain control.
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Operating Truck, Semi-Trailer
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37.Why is it important to monitor your air pressure gauges in a truck?
Air brakes rely on adequate pressure. A drop in pressure can result in reduced braking or full brake lock-up. Always monitor your gauges.
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Operating Truck, Semi-Trailer
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38.What happens if the air pressure in a truck drops too low?
Commercial vehicles with air brakes are designed to engage the spring (emergency) brakes if air pressure falls below safe levels.
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Operating Truck, Semi-Trailer
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39.Why should a truck driver avoid over-revving the engine?
Over-revving causes wear, overheating, and poor fuel economy. Shift at recommended RPMs to keep the engine healthy and efficient.
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Operating Truck, Semi-Trailer
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40.How does road camber affect truck handling?
Cambered roads slope outward to drain water, but they can cause the truck to drift sideways. Extra steering effort may be needed.
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Operating Truck, Semi-Trailer
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41.How often should a driver check the load during a trip?
Load checks must be done at the start, within the first 80 km, and then every 3 hours or 240 km to prevent cargo shift or loss.
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0 Correct
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- Passing Score 80%