Vehicle Equipment & Safe Operation — Delaware
Delaware CDL practice test: 443 free practice questions (Based on the official driver handbook). The official format is not yet verified; check the official site before your test. Vehicle Equipment & Safe Operation: 185 questions.
Brakes, tires, lights, mirrors, seat belts, child seats and basic vehicle control.
This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines.
| Topic / Metric | Value |
|---|---|
| Topic | Vehicle Equipment & Safe Operation |
| License test | Delaware CDL permit (CLP) knowledge tests |
| Topic questions | 185 (42% of 443 total) |
| Review status | This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines. |
Official handbook
Not yet verified
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Questions (185)
1. Friction in an S-cam brake is caused when the brake shoes and linings:
- Press against the outside of the brake drum.
- Press against the inside of the brake drum. ✓
- Push against each other.
Answer: B. Press against the inside of the brake drum.
Friction is caused when the brake shoes and linings press against the inside of the brake drum. The handbook describes the foundation brake as having its braking mechanism inside the drum. It says that to stop, the brake shoes and linings are pushed against the inside of the drum, and this causes friction that slows the vehicle and creates heat. The S-cam description agrees: the cam forces the shoes apart and presses them against the inside of the drum. So the contact that produces friction is between the shoes/linings and the inner drum surface.
2. Most heavy trucks with manual transmissions require ____ to change gears.
- Single clutching
- Double clutching ✓
- Triple clutching
Answer: B. Double clutching
Most heavy trucks with manual transmissions require double clutching to change gears. The handbook says that in most big vehicles whose manual transmissions are not synchronized, changing gears calls for double clutching. It also notes that a synchronized manual transmission does not need double clutching. Since the question asks about most heavy trucks with manual transmissions, the supported choice is double clutching. Double clutching means you use the clutch and pass through neutral so engine and gear speeds can match before the next gear. The handbook adds that staying too long in neutral can make the next shift harder, so the method takes practice.
3. During a basic vehicle control skills test, what is considered an encroachment?
- A driver placing the vehicle in neutral and applying the parking brake.
- The vehicle touching an exercise boundary line. ✓
- A driver properly completing an exercise in the skills test.
- An applicant trying to bribe the examiner.
Answer: B. The vehicle touching an exercise boundary line.
An encroachment is when the vehicle touches an exercise boundary line, so the correct choice is the one about touching an exercise boundary line. The handbook says an encroachment happens when any part of your vehicle makes contact with or goes past a boundary line or cone, except for mirrors or certain high-mounted unique parts. The answer describes the vehicle touching an exercise boundary line, which fits that definition. The examiner counts each touch or crossing as an error and stops you so you can return the vehicle within the exercise boundaries.
4. During a vehicle inspection, ensure that lug nuts are all of the following, except:
- Free of cracks.
- Free of distortions.
- Loose. ✓
- Free of rust.
Answer: C. Loose.
The exception is loose: during inspection, lug nuts must not be loose. The handbook says to check that all lug nuts are present and that they are not loose. It also says to look for rust trails or shiny threads, which can be signs of looseness. A loose lug nut is a defect, not a condition you want to ensure. The handbook warns that loose or missing nuts can let a wheel come off and cause a crash, so the inspection is meant to catch looseness, not confirm it.
5. When only the tractor is equipped with an Anti-Lock Braking System (ABS):
- There is a decreased risk of jackknifing. ✓
- There is an increased risk of jackknifing.
- The brakes will not work as effectively as they would without ABS.
- The brakes will become more sensitive.
Answer: A. There is a decreased risk of jackknifing.
6. If the spring brakes are activated, you should never:
- Push down the brake pedal. ✓
- Open the hood.
- Release air from the air storage tanks.
- Open the door to the cab.
Answer: A. Push down the brake pedal.
If the spring brakes are activated, you should never push down the brake pedal. The handbook says spring brakes are held back by air pressure and come on when that pressure is removed. In its caution about parking brake controls, it says never push the brake pedal down while the spring brakes are on. Doing so can damage the brakes because the force from the springs and the air pressure combine. The handbook notes that many systems are built to prevent this, but not all are, so the safe habit is to keep your foot off the brake pedal when the spring brakes are applied.
7. There are blind spots ____ left and right side flat mirrors.
- Immediately below ✓
- In the middle of
- Above
- To the left of
Answer: A. Immediately below
There are blind spots immediately below the left and right side flat mirrors, and also in front of each of them. The handbook describes the outside left and right flat mirrors as mounted at the front corners of the bus, used to watch traffic, check clearances, and keep an eye on students along the sides and toward the rear. In the same description it states that a blind spot sits right below and in front of each of these mirrors, with another one directly behind the rear bumper. So the area tucked under the mirror is the one you cannot count on the mirror to show you.
8. To prevent your vehicle from rolling backward when beginning to move, you can:
- Partly engage the clutch before taking your foot off the brake pedal. ✓
- Place the vehicle in second gear.
- Use the parking brake when stopping.
Answer: A. Partly engage the clutch before taking your foot off the brake pedal.
To prevent rolling backward when beginning to move, partly engage the clutch before taking your foot off the brake pedal. The handbook says not to roll back when you start because you may hit someone behind you. For a manual transmission vehicle, it tells you to partly engage the clutch before you take your right foot off the brake. That gives you a way to hold the vehicle as you move from brake to engine power. The same passage also mentions using the parking brake when needed, but the specific manual-transmission step for beginning to move is the partial clutch engagement before releasing the brake.
9. When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.
- The Anti-Lock Braking System
- The emergency braking system
- The trailer service brakes ✓
Answer: C. The trailer service brakes
You use the hand control while moving slowly forward when testing the trailer service brakes. The handbook describes the trailer service brake test this way: make sure air pressure is normal, release the parking brakes, roll forward slowly, and apply the trailer brakes with the hand control if the vehicle has one. Feeling the brakes come on shows the trailer brakes are connected and working. The same passage notes that in normal driving the foot pedal controls the service brakes, but the hand valve is used for this test.
10. When performing a pre-trip inspection and looking into the fifth wheel gap, you should:
- Make sure the locking jaws are open.
- Make sure the locking jaws are fully closed around the kingpin. ✓
- Make sure the locking jaws are loose.
Answer: B. Make sure the locking jaws are fully closed around the kingpin.
You should make sure the locking jaws are fully closed around the kingpin. The handbook says that when you look into the fifth wheel gap, the locking jaws or lever must be fully secured around the kingpin, and you should check for play between the kingpin and the jaws or lever. It also describes checking that the fifth wheel jaws have closed around the shank of the kingpin and that the locking lever is in the lock position. This confirms the trailer is actually locked to the tractor, not just resting on the fifth wheel. If there is space or the jaws are not closed, something is wrong.
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Last checked: 2026-10-17 · Not yet verified
Updated: · Based on the official driver handbook