Vehicle Equipment & Safe Operation — Mississippi
Mississippi CDL practice test: 463 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: 216 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 | Mississippi CDL permit (CLP) knowledge tests |
| Topic questions | 216 (47% of 463 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 (216)
1. Pressing and releasing the brake pedal unnecessarily can:
- Release air faster than it can be replaced. ✓
- Add more air to a brake system.
- Make the brake pedal harder to depress.
- Create a loud noise.
Answer: A. Release air faster than it can be replaced.
Pressing and releasing the brake pedal unnecessarily can release air faster than it can be replaced. In an air brake system, letting up on the pedal reduces air pressure and releases the brakes, and some compressed air leaves the system. The tank pressure then has to be restored by the compressor. The handbook warns that pumping the pedal without need can let air out faster than the compressor can put it back. That matters because if tank pressure falls too low, the brakes will not work.
2. What tells you how much pressure is in your vehicle's air tanks?
- The supply pressure gauge ✓
- The ABS malfunction lamp
- The tractor protection valve
Answer: A. The supply pressure gauge
The supply pressure gauge tells you how much pressure is in your air tanks. The handbook says every vehicle with air brakes has a pressure gauge hooked to the air tank, and on a dual air brake system you get a gauge for each half of the system (or one gauge with two needles). It states plainly that these gauges show the pressure inside the air tanks. So when you want to know how much air you have in reserve, the supply pressure gauge is what you read.
3. If the low air pressure warning signal comes on in a vehicle with air brakes, the driver should:
- Test the brakes while driving, but continue driving if nothing seems wrong.
- Immediately stop driving. ✓
- Drive with the hazard lights activated.
Answer: B. Immediately stop driving.
The driver should immediately stop driving and park safely. The handbook says to watch the low air pressure warning light and buzzer. If the warning comes on while you are driving, stop as soon as you can and park safely. With low air pressure, one of the air systems may be too low, so either the front or rear brakes will not work fully, and stopping will take longer. The handbook also says to bring the vehicle to a safe stop and have the air brake system fixed.
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 driving a vehicle equipped with an Anti-Lock Braking System (ABS), you should:
- Stop harder than you would in a vehicle not equipped with ABS.
- Use extra braking force to ensure the ABS kicks in.
- Brake as you would in a vehicle not equipped with ABS. ✓
- Brake with less force than you would in a vehicle not equipped with ABS.
Answer: C. Brake as you would in a vehicle not equipped with ABS.
You should brake as you would in a vehicle not equipped with ABS. The handbook says ABS is an add-on to your normal brakes. It does not increase or decrease your normal braking power, and it does not change the way you normally brake. Under normal brake conditions, the vehicle stops as it always stopped. ABS only comes into play when a wheel would otherwise lock up because of overbraking. It may help you keep control during hard braking, but it does not necessarily shorten stopping distance. So the correct habit is to use your normal braking method.
6. When checking the air and electrical lines during a vehicle inspection, all of the following should be true, except:
- The air hoses are making a hissing noise. ✓
- The air hoses and electrical lines are not cut.
- The air lines are not pinched.
- The air lines are not dragging against tractor parts.
Answer: A. The air hoses are making a hissing noise.
The exception is the air hoses making a hissing noise; a hissing sound points to an air leak, not a good inspection result. The handbook says to check that the air and electrical connectors are seated and sealed, and that the hoses and lines are not cut, cracked, chafed, spliced, taped, or worn. It also says the lines should not be tangled, crimped, pinched, or dragging against vehicle parts or the ground. Inspectors are told to listen for air leaks. A hissing noise is a sign of escaping air, so it is not something that should be true during a good inspection.
7. The ____ tells a driver how much pressure is in the air tanks.
- Application pressure gauge
- Air compressor governor
- Supply pressure gauge ✓
- Drum brake
Answer: C. Supply pressure gauge
The supply pressure gauge tells the driver how much pressure is in the air tanks. The handbook says vehicles with air brakes have a pressure gauge connected to the air tank. That gauge shows the pressure stored in the tank. On a dual air brake system, there is a gauge for each half, or one gauge with two needles. This description matches the question exactly: the supply pressure gauge reports air-tank pressure, not brake application pressure or some other brake part.
8. When braking with ABS, you should:
- Push the brake pedal harder than usual.
- Push the brake pedal as you normally would. ✓
- Push the brake pedal more lightly than usual.
Answer: B. Push the brake pedal as you normally would.
9. Truck tractors with air brakes that were built on or after March 1, 1997 are equipped with:
- An extra set of brakes.
- Voice-activated brakes.
- Cruise control.
- Anti-Lock Braking Systems (ABS). ✓
Answer: D. Anti-Lock Braking Systems (ABS).
Truck tractors with air brakes built on or after March 1, 1997 are equipped with Anti-Lock Braking Systems (ABS). The handbook says the Department of Transportation requires ABS on truck tractors with air brakes built on or after March 1, 1997. It describes ABS as a computerized system that keeps wheels from locking up during hard brake applications. That direct requirement makes ABS the equipment named for these tractors. The handbook also notes that ABS works with the normal brakes and helps the driver keep control during hard braking, rather than replacing the regular brake system.
10. A low air pressure warning signal:
- Is not recommended on vehicles with air brakes.
- Is required on vehicles with air brakes. ✓
- Is optional on vehicles with air brakes.
Answer: B. Is required on vehicles with air brakes.
A low air pressure warning signal is required on vehicles with air brakes. The handbook states directly that an air-brake vehicle must have a low-pressure warning signal. It also describes the warning as something visible that comes on before tank pressure drops below 55 psi, with a buzzer possibly sounding too. A test-your-knowledge item repeats the same rule as a true statement. That makes the warning a required safety feature on air-brake vehicles, not an optional add-on or something to avoid.
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Last checked: 2026-10-17 · Not yet verified
Updated: · Based on the official driver handbook