Vehicle Equipment & Safe Operation — Montana
Montana CDL practice test: 435 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: 181 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 | Montana CDL permit (CLP) knowledge tests |
| Topic questions | 181 (42% of 435 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 (181)
1. The emergency air line:
- Is controlled by the foot brake.
- Is connected to the relay valves.
- Supplies air to the trailer air tanks. ✓
- Prevents skids.
Answer: C. Supplies air to the trailer air tanks.
The emergency air line supplies air to the trailer air tanks. The handbook separates the two air lines by job. The service line, also called the control or signal line, carries air controlled by the foot brake or trailer hand brake, and it connects to relay valves. The emergency line, also called the supply line, does two things: it supplies air to the trailer air tanks and it controls the emergency brakes. Since the question asks what the emergency line does, filling the trailer air tanks is the listed answer.
2. Which of the following is not a reason to cover cargo?
- To protect people from spilled cargo
- To protect the cargo from weather
- To protect the cargo from animals ✓
Answer: C. To protect the cargo from animals
Protecting the cargo from animals is not one of the reasons to cover cargo; the reasons given are to protect people from spilled cargo and to protect the cargo from weather. The handbook lists exactly two basic reasons for covering cargo on an open bed: keeping people safe from spilled cargo, and shielding the cargo from weather. Protecting the cargo from animals never appears on that list. Since the question asks which choice is not a reason, the animal-protection choice is the one that does not fit the handbook's two stated reasons.
3. In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:
- You will be unable to move the vehicle.
- A separate air tank can be used to release the spring brakes for a short period of time. ✓
- You can use the spring brakes to continue driving normally.
- The air tanks will automatically refill to a safe air pressure level.
Answer: B. A separate air tank can be used to release the spring brakes for a short period of time.
A separate air tank can be used to release the spring brakes so you can move the vehicle for a short time. The handbook explains that when main air pressure is lost, the spring brakes come on. On some vehicles, like buses, a separate air tank is plumbed in so you can release those spring brakes and move in an emergency. One valve is spring loaded in the out position: push it in and air from that separate tank frees the brakes, and letting go puts them back on. The handbook warns the separate tank only holds enough air to do this a few times, so plan your move carefully or you may end up stopped somewhere dangerous when that air runs out.
4. When asked about the vehicle's oil during the vehicle inspection test, you must be able to do all of the following, except:
- Indicate where the dipstick is located.
- Show that the oil level is within a safe operating range.
- Show that the oil level is above the refill mark.
- Show that the oil level is below the refill mark. ✓
Answer: D. Show that the oil level is below the refill mark.
You do not have to show that the oil level is below the refill mark — a level that low is a problem, not something to demonstrate. The vehicle inspection asks you to confirm that engine oil and the other fluids are at proper levels so the engine and related systems work correctly. A level in a safe operating range, at or above the refill mark, is what a proper level looks like. Oil sitting below the refill mark means the engine is low, so demonstrating that would show a fault instead of showing the check was done. That is the one item on the list that is not part of the oil check.
5. When starting the vehicle during the pre-trip inspection, the coolant temperature should:
- Decrease.
- Rise slowly. ✓
- Hold steady.
- Jump quickly.
Answer: B. Rise slowly.
When you start the engine during the pre-trip inspection, the coolant temperature should rise slowly toward the normal operating range. The handbook's gauge check says the coolant temperature should begin a gradual rise to normal operating range once the engine is started. A slow climb shows the engine is warming up as it should. That is why you watch for a gradual rise rather than a gauge that does nothing or moves all at once.
6. What is traction?
- Friction between the tires and road ✓
- Tires' rates of rotation
- The length of time needed to activate the brakes
Answer: A. Friction between the tires and road
Traction is the friction between the tires and the road. The handbook states plainly that traction is friction between the tires and the road. It also says you cannot steer or brake unless you have traction, and that slippery surfaces reduce traction and call for lower speeds. That definition points directly to friction as the grip that lets the tires work against the road, so the answer is the friction choice.
7. During a cargo fire, opening the trailer doors may actually cause the fire to expand because doing so:
- Allows oxygen into the trailer. ✓
- Changes the temperature of the trailer.
- Provides more moisture to the trailer.
Answer: A. Allows oxygen into the trailer.
8. During the vehicle inspection test, you will be asked to:
- Change a tire.
- Explain to the examiner what you are inspecting and why. ✓
- Estimate the weight of a load on a trailer.
Answer: B. Explain to the examiner what you are inspecting and why.
During the vehicle inspection test, you must tell the examiner what each item is and why you would check it. The handbook says the vehicle inspection test checks whether you know your vehicle is safe to drive. You must point to or touch each item, name it, and tell the examiner what you would check and why. So the explanation is part of the test itself; it is not a separate task like changing a tire or judging cargo weight. The seven-step method is given as a way to inspect in the same order each time so you are less likely to miss something.
9. When starting an engine, oil pressure should come up to a normal level:
- Within seconds. ✓
- Within five minutes.
- After about three minutes.
Answer: A. Within seconds.
Oil pressure should reach a normal level within seconds after you start the engine. The handbook's vehicle inspection section says to look at the oil pressure gauge after starting the engine and that it should rise to normal within seconds. That wording makes the short time frame the correct one. The same passage gives a three-minute figure for air pressure buildup, not oil pressure, so it does not support treating oil pressure as a slow gauge.
10. When entering a curve, you should:
- Shift into neutral.
- Use the shoulder.
- Downshift. ✓
Answer: C. Downshift.
When entering a curve, you should downshift to the right gear before you enter the curve. The handbook says to slow down to a safe speed and shift to the right gear before entering a curve. Doing this lets you keep some power on through the bend, which helps the vehicle stay more stable while turning. It also puts you in position to speed up once you are out of the curve. That is why the correct choice is to downshift before the curve, not after you are already in it.
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Last checked: 2026-10-17 · Not yet verified
Updated: · Based on the official driver handbook