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Operating Truck, Semi-Trailer
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1.When coupling a semi-trailer to a tractor, the fifth wheel must be:
The fifth wheel should be clean, lubricated, and the locking jaws must fully close around the kingpin to ensure a safe and secure connection.
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Operating Truck, Semi-Trailer
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2.When backing a semi-trailer, it is best to:
Use both side mirrors and reverse slowly and smoothly while watching the trailer movement. Backing should always be done with caution.
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Operating Truck, Semi-Trailer
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3.A jackknife occurs when:
A jackknife happens when the trailer swings out of line, often caused by sudden braking, slippery roads, or improper speedu2014especially during sharp turns.
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Operating Truck, Semi-Trailer
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4.Before descending a long downgrade with a loaded semi-trailer, you should:
Always shift to a lower gear before descending to use engine braking. Relying only on brakes can cause overheating and reduce stopping ability.
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Operating Truck, Semi-Trailer
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5.When driving a loaded semi-trailer, the stopping distance is:
A fully loaded semi-trailer requires significantly longer stopping distance than smaller vehicles, especially at highway speeds or downhill slopes.
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Operating Truck, Semi-Trailer
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6.If the trailer’s air supply is not connected properly, it may:
Improper air connection can result in loss of braking ability in the trailer, which is extremely dangerous and can lead to accidents.
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Operating Truck, Semi-Trailer
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7.To prevent trailer swing or drift during a turn:
Reduce speed before entering the turn, and avoid sudden movements. This helps the trailer track properly behind the tractor.
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Operating Truck, Semi-Trailer
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8.A tug test is used to:
A tug test ensures the fifth wheel is properly engaged with the trailer’s kingpin by gently pulling forward in low gear to check connection.
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Operating Truck, Semi-Trailer
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9.If a trailer begins to skid, the first action should be to:
Releasing the brakes can help the wheels regain traction. Do not overcorrect with the steering. Regain control before braking again.
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Operating Truck, Semi-Trailer
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10.Before turning right in a truck with a long trailer, you should:
Proper right turns require pulling slightly forward or to the right, then making a wide turn to prevent trailer from hitting curbs or objects.
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Operating Truck, Semi-Trailer
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11.If your trailer brakes lock up on a slippery surface, it may cause:
Locked trailer wheels on slippery roads can cause skidding or jackknifing, where the trailer moves independently of the tractor.
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Operating Truck, Semi-Trailer
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12.When should the trailer hand valve be used during normal driving?
The trailer hand valve is for testing trailer brakes, not for regular braking while driving. Using it can cause skidding or instability.
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Operating Truck, Semi-Trailer
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13.Why is it important to check the glad hands during coupling?
Glad hands connect air lines between the truck and trailer. Check for tight, undamaged connections to ensure safe brake operation.
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Operating Truck, Semi-Trailer
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14.When approaching a railroad crossing in a truck with a trailer:
Always ensure the entire truck and trailer can clear the tracks before crossing to avoid getting stuck on or blocking the tracks.
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Operating Truck, Semi-Trailer
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15.The longer the combination vehicle, the more you need to:
Longer vehicles require greater stopping distance and wider turning radius, especially at intersections or tight curves.
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Operating Truck, Semi-Trailer
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16.What should you do before descending a long downgrade with a heavy semi-trailer?
Shifting into a lower gear before descending helps control speed using engine braking, reducing brake wear and preventing overheating.
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Operating Truck, Semi-Trailer
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17.When coupling a trailer, which action ensures the fifth wheel is properly locked?
A tug test ensures the fifth wheel jaws have locked around the kingpin by gently pulling forward with trailer brakes applied.
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Operating Truck, Semi-Trailer
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18.What can happen if you drive a semi-trailer with a misaligned trailer connection?
Misalignment leads to increased tire wear, swaying, and loss of control. Always ensure the trailer is aligned straight with the tractor unit.
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Operating Truck, Semi-Trailer
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19.When parking a truck and semi-trailer on a hill, what should you do first?
On a slope, wheel chocks help prevent movement even if air pressure drops or parking brakes fail. It’s a key safety measure.
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Operating Truck, Semi-Trailer
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20.During a left turn, how do you avoid trailer off-tracking?
Starting wide helps keep the trailer wheels from cutting the corner, reducing the risk of striking curbs or obstacles.
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Operating Truck, Semi-Trailer
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21.Which gear should be used when starting a fully loaded semi-trailer on an incline?
Low gear provides maximum torque for starting heavy loads on inclines, preventing rolling back or stalling.
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Operating Truck, Semi-Trailer
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22.When should you check that air pressure has built up to the proper level before driving?
Air pressure must reach safe levels before brake systems operate properly. Releasing brakes early can cause roll-away or brake failure.
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Operating Truck, Semi-Trailer
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23.If your trailer starts to jackknife, what is the best first response?
Jackknifing occurs when the trailer swings uncontrollably. Applying trailer brakes may help straighten the trailer before it worsens.
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Operating Truck, Semi-Trailer
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24.When driving an articulated truck through strong crosswinds, what should you watch for?
High-sided trailers are vulnerable to crosswinds, which can cause swaying or even tipping if not controlled.
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Operating Truck, Semi-Trailer
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25.Why is it important to check gladhand seals during inspection?
Gladhands connect air lines between tractor and trailer. Damaged seals cause air leaks, reducing brake efficiency.
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Operating Truck, Semi-Trailer
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26.How do you reduce brake fade on long descents?
Engine braking combined with a lower gear allows controlled descent without overusing service brakes, preventing fade.
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Operating Truck, Semi-Trailer
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27.When uncoupling a trailer, what is the final step?
The last step is to gently pull the tractor forward and confirm the trailer is stable with landing gear fully deployed.
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Operating Truck, Semi-Trailer
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28.What causes trailer swing or fishtailing at high speeds?
Fishtailing is caused by sudden movements, high speed, or unbalanced loads. It’s dangerous and can lead to a crash.
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Operating Truck, Semi-Trailer
029/30
29.What is the best action if you hear loud air leakage while parked?
Any significant air leak from air brake components should be reported and repaired immediately before operating the vehicle.
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