General Knowledge · Practice test 6

Question 1Not answered

What is the purpose of checking the exhaust system during a pre-trip inspection?

1. A leaking exhaust can let dangerous fumes enter the cab or sleeper
2. Exhaust components never need inspection between scheduled services
3. It is checked only to confirm emissions sticker compliance
4. Exhaust leaks only affect the vehicle's noise level, nothing else

Question 2Not answered

In a front-wheel skid, what typically happens to the truck's steering response?

1. The steering becomes unusually sensitive and oversteers
2. The truck automatically corrects itself with no input needed from the driver
3. Front-wheel skids do not affect steering at all
4. The truck continues to go straight ahead no matter how you turn the wheel

Question 3Not answered

What is the required 30-minute break rule generally aimed at preventing?

1. Drivers exceeding the posted speed limit
2. Overloading of cargo during long hauls
3. Drivers taking on too many consecutive delivery stops without any pause at all
4. Driving for long stretches without any rest, which increases fatigue-related risk

Question 4Not answered

If your accelerator pedal sticks and the engine keeps accelerating unexpectedly, what should you do?

1. Turn off the engine immediately while still at highway speed
2. Continue driving normally and simply tap the pedal a few times to loosen it, a shortcut that doesn't actually apply to unexpectedly
3. Pump the accelerator rapidly to try to free it
4. Shift to neutral or press the clutch, and brake to slow the vehicle while steering to a safe stop

Question 5Not answered

Why are your headlights less effective at revealing hazards at night than daylight vision is during the day?

1. Headlights only illuminate a limited distance ahead, shorter than your daytime seeing distance
2. Modern headlights eliminate the need for reduced night speeds
3. Nighttime driving hazards are identical to daytime hazards in every way, which isn't obvious without real day experience
4. Headlights only lose effectiveness in the rain, not on a clear night

Question 6Not answered

How does the actual safe speed for a curve sometimes differ from the posted speed limit?

1. Safe speed is always higher than the posted limit for commercial vehicles
2. The posted speed limit is always the exact safe speed regardless of conditions
3. There is no difference, since curve signs are recalculated for every vehicle type separately, which isn't obvious without real limit experience
4. The posted limit may still be too fast for current conditions like rain, cargo load, or reduced visibility

Question 7Not answered

What does 'targeting' mean in the context of visual search while driving?

1. A term used only for backing maneuvers
2. Picking a point on the road ahead to steer toward, rather than staring right in front of the vehicle
3. Aiming your headlights at oncoming traffic
4. Focusing on the exact spot where the vehicle will be a few seconds from now, not on the road surface itself

Question 8Not answered

What does total stopping distance include, beyond just the distance the brakes take to stop the vehicle?

1. The distance covered before you saw the hazard is not part of stopping distance
2. Only the time it takes the ABS system to activate
3. Perception distance and reaction distance, in addition to braking distance
4. Only the distance covered while the brake pedal is pressed

Question 9Not answered

Why do anti-lock braking systems (ABS) help reduce skid risk without eliminating the need for careful driving?

1. ABS only functions above 55 mph
2. ABS mainly shortens stopping distance, it does not prevent a skid from starting, an idea that doesn't match how driving works
3. ABS helps prevent wheel lockup but cannot overcome poor speed choices for the conditions
4. ABS makes it impossible to skid under any circumstances

Question 10Not answered

Why should you avoid resting your foot on the clutch pedal while driving, even lightly?

1. It mainly wears out the floor mat faster, not anything inside the clutch itself, something few drivers think about with lightly
2. Constant light pressure can cause premature wear on the clutch, and it isn't needed once you're in gear
3. It is required in order to keep the transmission cool
4. It has no effect on the clutch at all

Question 11Not answered

As a general-knowledge driver without a hazmat endorsement, what should you recognize about a diamond-shaped placard on another vehicle?

1. It means the vehicle is exempt from all traffic laws
2. It indicates the vehicle recently passed a state safety inspection and nothing more, a common blind spot when it comes to vehicle
3. It signals that vehicle is carrying a hazardous material and may need extra following distance or caution around it
4. It is purely decorative and carries no safety meaning

Question 12Not answered

What should you check about your planned route regarding fuel and rest stops before a long haul?

1. Only the total distance of the trip, not stop availability
2. Rest stops matter only on trips longer than 1,000 miles
3. Whether truck-accessible fuel and parking are available along the way, given hours-of-service limits
4. Fuel stops only need planning in very remote areas, not along major interstates, though it only feels that way with haul

Question 13Not answered

Why is it important to distribute weight evenly between the tractor's steering axle and drive axles, and the trailer axles?

1. Axle weight distribution only matters for passing a scale, not for how it drives, a point that's simple to get backwards with axles
2. Uneven distribution can overload some axles while leaving others with too little weight for good traction or steering
3. It only matters for vehicles crossing state lines
4. Total gross weight is all that matters, regardless of distribution

Question 14Not answered

What should you avoid doing with the steering wheel once you feel a rear-wheel skid beginning?

1. Making any steering adjustment at all
2. Taking your hands off the wheel briefly until the vehicle straightens itself out
3. Overcorrecting by turning the wheel too far in the opposite direction
4. Easing off the accelerator

Question 15Not answered

Why is it important to check that both the tractor and trailer air systems build and hold pressure separately during the pre-trip check?

1. Only the tractor's air system matters for safety
2. It is checked only for fuel economy purposes
3. A leak isolated to just one part of the system might otherwise go unnoticed
4. Tractor and trailer air systems are always identical and never checked separately

Question 16Not answered

Why is it useful for any driver to recognize the general shape of a cargo tank truck that may be hauling flammable liquids?

1. Tank truck shape reveals nothing about what might be inside
2. Only drivers following directly behind a tank truck need to recognize its shape, a habit that's hard to unlearn around liquids
3. All tank trucks carry the same type of cargo
4. It helps a driver decide to keep extra distance and avoid actions like open flame near the vehicle

Question 17Not answered

Why should you increase your following distance at night compared to driving the same road in daylight?

1. Vehicles brake the same at night, so following distance never needs to change after dark
2. There is no real need to change following distance at night
3. Reduced visibility at night gives you less time to notice and react to a hazard ahead
4. Following distance rules do not apply after sunset

Question 18Not answered

When should you choose a starting gear other than the lowest one available?

1. When the vehicle is lightly loaded and the lowest gear would cause the engine to over-rev before you shift
2. Never, since starting in a higher gear always stalls a loaded commercial vehicle, which sounds right but isn't, at least for available
3. Only when driving downhill from a stop
4. Only after the engine has completely warmed up

Question 19Not answered

Why do federal rules require specific routes for some placarded hazardous materials shipments?

1. To make hazardous materials shipments avoid tolls, regardless of population along the way, which only seems true until you deal with shipments
2. To reduce risk by avoiding densely populated areas or sensitive locations like tunnels where possible
3. It is done purely to track fuel tax across state lines
4. Route restrictions apply equally to every type of cargo, not just hazardous materials

Question 20Not answered

Why does even a non-hazmat driver need basic awareness of hazardous materials shipping papers?

1. Knowing where they are kept in the cab can help emergency responders act faster after a crash
2. Shipping papers are only relevant once a hazmat endorsement has been earned, though the reality of papers says otherwise
3. They are only useful for calculating fuel taxes
4. Non-hazmat drivers never encounter hazardous materials shipping papers

Question 21Not answered

What role does the Drug and Alcohol Clearinghouse play for commercial drivers?

1. It is a program that helps drivers purchase medication legally
2. It is a database employers must check for driver drug and alcohol violations before hiring
3. It only tracks violations reported by the driver's own employer, no one else, something few drivers think about with drivers
4. It replaces the need for any drug or alcohol testing

Question 22Not answered

Why should a driver periodically re-check cargo securement during a long trip, not just before departure?

1. It is only necessary if the driver hears an unusual noise
2. Re-checking is only required for hazardous materials shipments
3. Tie-downs only need checking again if the truck hits a significant pothole, which some drivers pick up wrong about departure
4. Vibration and shifting during the trip can loosen tie-downs that were secure at the start

Question 23Not answered

While stopped behind another vehicle at a signal on a hill, how much space should you leave in front of you?

1. Enough space to see the other vehicle's rear tires touch the road, in case it rolls back or you need to move around it
2. None, since staying close prevents other vehicles from cutting in
3. Enough room to see the rear tires of the vehicle ahead touch the pavement, though that's not how front actually works
4. Space in front only matters when the vehicle ahead is a motorcycle

Question 24Not answered

Why is backing toward your blind side, the side you cannot see well from the driver's seat, considered especially risky?

1. It is actually no different from backing toward the driver's side in terms of visibility
2. You have to rely entirely on mirrors and a helper instead of a direct view out the side window
3. Blind-side backing is illegal in every state, so the question does not apply to real driving
4. It only matters for very long trailers, not standard combination vehicles

Question 25Not answered

Why is backing on the blind side of the vehicle considered more dangerous than backing toward the driver's side?

1. The blind side is only a concern for very long trailers, not shorter ones, a detail that's easy to miss with side
2. Blind-side backing is actually safer because it forces slower speeds
3. It has no real difference from backing toward the driver's side
4. The driver has to rely entirely on mirrors, with no direct view of that side of the vehicle

Question 26Not answered

You are not endorsed to haul hazardous materials but are asked to move a placarded load a short distance. What should you do?

1. Decline, since operating a placarded load requires the hazmat endorsement regardless of distance
2. Move it if you cover the placards first
3. Move it only a short distance within the yard, since public roads are the only place the endorsement matters
4. Move it since it is only a short distance

Question 27Not answered

Why should you avoid 'overdriving your headlights' at night?

1. It means driving faster than the distance your headlights let you see and react in time to stop
2. It only applies to vehicles with dim or aging headlights
3. It refers to using high beams for too long in a row
4. It describes forgetting to turn your headlights on until another driver flashes you, which only seems true until you deal with night

Question 28Not answered

As part of the whole vehicle air brake check on a combination vehicle, what confirms the trailer's brakes are working through the tractor protection system?

1. Listening for the horn while the trailer is disconnected
2. Using the trailer air supply control to apply and release the trailer's emergency brakes and observing that they respond correctly
3. Checking that the trailer's marker lights come on when the headlights are switched on, which surprises a lot of drivers new to system
4. Confirming the trailer's cargo doors close properly

Question 29Not answered

How should you adjust your driving at night compared to during the day, given reduced visibility?

1. Drive at the same speed since speed limits do not change after dark, a shortcut that doesn't actually apply to visibility
2. Reduce speed so you can stop within the distance your headlights actually illuminate
3. Increase speed slightly since traffic is usually lighter at night
4. Rely on your high beams at all times once the sun goes down

Question 30Not answered

What should you check regarding the brake pedal's feel (a 'fade test') during the air brake pre-trip inspection?

1. That the pedal feels the same at the top of the stroke as at the bottom, which some drivers pick up wrong about inspection
2. That the pedal makes an audible click when pressed
3. That firm, steady pressure on the pedal does not cause the pedal to slowly sink further
4. That the pedal feels identical to a hydraulic brake pedal in a car