Combination Vehicles · Practice test 2

Question 1Not answered

You are turning a long combination vehicle at an intersection. Why should you avoid turning too early?

1. It only matters for vehicles pulling more than one trailer at once, never a single trailer combination like this one
2. It has no effect on the trailer's path
3. The trailer's wheels will cut the corner sharply due to off-tracking and could hit a curb or another vehicle
4. Turning early saves fuel

Question 2Not answered

Why should you visually confirm the fifth wheel's locking mechanism has fully engaged, rather than assuming it locked from sound alone?

1. Visual confirmation is unnecessary once a click is heard
2. A visual check confirms the jaws are actually closed around the kingpin, since sound alone can be misleading
3. The locking mechanism cannot be seen from outside the vehicle
4. Sound is always a completely reliable way to confirm the coupling is fully locked around the kingpin

Question 3Not answered

When the ignition is turned on, the ABS warning lamp briefly lights up and then goes off while driving begins. What does this indicate?

1. The vehicle is not safe to drive until the lamp is inspected by a mechanic
2. The ABS has already failed and needs immediate repair
3. The brakes are not connected properly
4. This is a normal self-check, confirming the ABS system is working correctly

Question 4Not answered

Why is practicing turns with a specific combination in an empty lot useful for a new driver?

1. It mainly helps with fuel efficiency, not turning technique
2. It lets the driver learn exactly how much that particular combination off-tracks before doing it in traffic
3. It is required before every single trip regardless of experience
4. Every combination off-tracks by the exact same fixed amount, so practicing the turn beforehand has no real benefit

Question 5Not answered

Why should you pull forward gently to test the coupling after backing under a trailer, before fully trusting it is locked?

1. It is done only to check tire pressure indirectly
2. Pulling forward has no diagnostic value for coupling security, only the sound does
3. It should be done at full speed to fully test the connection
4. A gentle pull confirms the fifth wheel actually caught and locked around the kingpin

Question 6Not answered

Why is off-tracking a particular concern when making a right turn at a narrow intersection?

1. Off-tracking has no relevance to right turns, only left turns
2. The trailer's wheels can cut the corner and go up onto a curb or into another lane if not accounted for
3. Trailers always avoid curbs automatically no matter how the driver positions the tractor for the turn
4. It only matters for turns onto a highway on-ramp

Question 7Not answered

What should a driver do during the pre-trip inspection to confirm the tractor's ABS warning lamp is functioning?

1. Turn on the ignition and confirm the ABS lamp illuminates briefly, then goes out if there is no fault
2. There is no way to check the ABS lamp before driving
3. Confirm the lamp stays on continuously during normal operation
4. Check only the trailer's lamp during the pre-trip, since the tractor has no separate ABS indicator of its own

Question 8Not answered

You are pulling into a narrow driveway with a combination vehicle. Why should off-tracking affect how wide you swing before turning in?

1. You should swing wide only to protect the tractor, not the trailer
2. Off-tracking only matters on public highways, not driveways
3. Narrow driveways eliminate off-tracking entirely because the tighter turning angle cancels out the effect completely
4. The trailer's wheels will cut inside your turn, so you need extra clearance to avoid hitting the driveway's edge

Question 9Not answered

Why is off-tracking a particular hazard to pedestrians and cyclists waiting at a corner?

1. Pedestrians and cyclists are legally required to stand outside the off-tracking zone at every marked corner
2. Off-tracking only affects vehicles, never people or bicycles
3. They may be standing in the space the tractor already cleared, not realizing the trailer's wheels will still cut through it
4. Off-tracking makes the trailer's path more visible to people waiting nearby

Question 10Not answered

During a pre-trip inspection, why should you check the tandem axle slider's locking pins on the trailer?

1. Slider pins are checked only during the once-a-year annual inspection, never as part of a routine pre-trip check
2. Slider pins only affect ride comfort, not safety
3. The pins are purely decorative on most modern trailers
4. If the pins aren't fully engaged, the slider can shift while driving and change the trailer's weight distribution and handling

Question 11Not answered

Why does merging onto a highway require more planning in a combination vehicle than in a car?

1. It only matters when merging onto a two-lane road
2. Merging rules are identical for all vehicle types with no extra planning needed at any speed
3. Combination vehicles accelerate faster than passenger cars
4. The combination accelerates more slowly, especially loaded, and needs a larger gap in traffic

Question 12Not answered

Why should you check your mirrors more frequently when driving a combination vehicle compared to a single vehicle?

1. Trailers eliminate the need for mirror checks entirely
2. It helps you monitor the trailer's tracking and confirm it is following in the expected path
3. It is only necessary while backing up, never while driving forward down the open highway
4. Mirror checks are less important with a trailer attached

Question 13Not answered

When should a driver deliberately use a runaway truck ramp?

1. Only when instructed to do so by another driver over the CB radio during a convoy or escorted move
2. Whenever traffic ahead is moving slower than desired
3. When brakes are fading or failing on a downgrade and stopping normally is no longer possible
4. As a shortcut to skip a weigh station

Question 14Not answered

A steer tire blows out while you are pulling a loaded trailer at highway speed. What is the correct response?

1. Grip the wheel firmly, hold your lane, and ease off the accelerator without braking hard
2. Brake hard immediately to stop as fast as possible
3. Accelerate briefly to maintain stability
4. Steer sharply toward the shoulder right away before easing off the accelerator or touching the brake at all

Question 15Not answered

Why is it especially important to avoid hard braking on a curve in a combination vehicle with a full load?

1. A full load reduces the risk of skidding while cornering
2. Braking and cornering forces combine, using up available tire traction faster and increasing skid risk
3. Braking on a curve has no different effect at all than braking on a straight, flat stretch of road
4. It only matters for vehicles without ABS

Question 16Not answered

What does an ABS malfunction indicator light on the trailer usually indicate if it stays on after startup?

1. A problem with the trailer's ABS system, though the regular brakes should still work
2. That the trailer is not properly coupled to the tractor's fifth wheel at all and needs recoupling
3. That the trailer brakes have been completely disabled
4. That the tires are underinflated

Question 17Not answered

What is off-tracking in a combination vehicle?

1. A malfunction in the vehicle's GPS navigation system that affects route guidance, not steering
2. A malfunction in the vehicle's GPS navigation
3. The trailer bouncing on rough roads
4. The way the rear wheels cut inside the arc the front wheels traced while turning

Question 18Not answered

During a long downgrade, you notice a burning smell and the brakes feel less effective than usual. What does this suggest, and what should you do?

1. The brakes may be overheating from overuse, so you should find a safe place to stop and let them cool before continuing
2. You should pour water directly on the hot brakes to cool them down quickly while continuing to drive downhill
3. It is normal on any downgrade and no action is needed
4. You should apply the parking brake fully to take over for the service brakes

Question 19Not answered

Does a lit ABS malfunction lamp on the tractor or trailer mean the vehicle has failed its inspection and cannot be driven?

1. Not by itself, since the regular service brakes still work, but the fault should still be reported and repaired promptly
2. It only matters if the lamp stays lit for more than a week
3. No, an ABS malfunction lamp can always be ignored indefinitely with no real consequence to the driver
4. Yes, any ABS fault makes the vehicle immediately unsafe to move at all

Question 20Not answered

What is the correct order of steps when uncoupling a trailer, regarding the landing gear and fifth wheel release?

1. Landing gear is not needed if the uncoupling is done quickly
2. Lower the landing gear to support the trailer before releasing the fifth wheel locking mechanism
3. Release the fifth wheel locking mechanism first, then lower the landing gear afterward to support the trailer
4. The order does not matter as long as both are eventually done

Question 21Not answered

Why should a driver still practice good speed management and following distance even in a combination vehicle fully equipped with ABS?

1. ABS helps prevent wheel lockup but does not shorten the physical distance needed to stop
2. ABS eliminates the need for any following distance
3. ABS makes speed management irrelevant on any road surface
4. ABS allows a vehicle to stop in half the normal distance regardless of speed or load

Question 22Not answered

How does recovering from a front-wheel skid differ from recovering from a drive-wheel or trailer skid?

1. A front-wheel skid is recovered the exact same way as a trailer skid, by steering hard into the direction of the slide and holding it
2. Front-wheel skids cannot be recovered from and always end in a collision
3. A front-wheel skid is recovered mainly by easing off the brake or accelerator and waiting for traction to return, since steering has little effect until then
4. A front-wheel skid should always be met with hard braking to regain grip

Question 23Not answered

After backing the tractor under the trailer and locking the fifth wheel, how do you confirm the coupling is secure?

1. Visually check from a distance only, without physically testing that the coupling holds
2. Check only the air line connections
3. Pull the tractor forward gently against the locked fifth wheel to test that it holds
4. Rely on the sound of the jaws closing

Question 24Not answered

When backing a combination vehicle, how does the trailer's movement relate to off-tracking?

1. Off-tracking does not occur while backing, only while moving forward through a turn
2. The trailer always follows the tractor's exact path in reverse
3. The trailer swings in the opposite direction from the way you turn the steering wheel
4. The trailer moves independently of the steering wheel while backing

Question 25Not answered

Your tractor's ABS is working normally, but the trailer's ABS malfunction lamp is lit. How should this change your driving?

1. Switch to using only the trailer hand valve until the lamp goes out
2. Avoid using the brakes at all until the trailer is repaired
3. Brake a little earlier and more gently than usual, since the trailer's wheels could lock up under hard braking
4. No change is needed, since the tractor's ABS system automatically covers braking for the whole combination

Question 26Not answered

During a combination vehicle inspection, what should you check regarding the kingpin and upper coupler plate?

1. Only that the kingpin is a specific brand
2. That the kingpin is not bent or worn and the upper coupler plate is not cracked
3. That the coupler plate is loosely fitted for easier future uncoupling
4. Nothing specific, since the kingpin and coupler plate are checked only during annual inspections

Question 27Not answered

Besides the coupling itself, what trailer components should you inspect as part of a full combination vehicle pre-trip?

1. Only the trailer's marker lights, since brakes and tires are covered by the annual inspection
2. Nothing beyond the coupling, since the rest of the trailer is the shipper's responsibility
3. Only the cargo securement, not the trailer's own running gear
4. The trailer's tires, wheels, and mud flaps, along with its lights and reflectors

Question 28Not answered

Is a trailer built before ABS was required legally allowed to be retrofitted with an antilock system?

1. Yes, retrofitting is possible and can be a worthwhile safety upgrade even though it isn't required on older trailers
2. No, ABS can only ever be installed at the factory during manufacture and never added afterward by a repair shop
3. No, only tractors can have ABS added after manufacture
4. Retrofitting is illegal under any circumstances

Question 29Not answered

Before backing a tractor under a trailer to couple, why should the trailer's parking brakes be set?

1. It's only needed on a downhill grade, never on flat ground
2. So the trailer cannot roll while the tractor is positioning underneath it
3. It makes the fifth wheel lock automatically once contact is made
4. Setting the brakes has no real purpose before coupling, it's just habit

Question 30Not answered

How does keeping the trailer properly loaded and secured reduce skid risk during a sudden maneuver?

1. A stable, evenly distributed load keeps the vehicle's weight predictable, which supports consistent handling
2. Only unsecured cargo affects fuel economy, not handling
3. Cargo securement has no real relationship to how the vehicle handles a sudden maneuver out on the road
4. Skid risk is entirely determined by tire condition, regardless of load