Vehicle Equipment & Safe Operation — Nevada
Nevada CDL practice test: 457 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: 190 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 | Nevada CDL permit (CLP) knowledge tests |
| Topic questions | 190 (42% of 457 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
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Questions (190)
1. Which of the following is not a type of retarder?
- Exhaust
- Engine
- Air ✓
Answer: C. Air
Air is not a type of retarder. The handbook passage on retarders lists four basic types: exhaust, engine, hydraulic, and electric. It says retarders help slow a vehicle and reduce the need to use the brakes. Because air is not among the four types named in that list, it is the choice that does not belong. The other two choices are named directly as retarder types in the same passage.
2. During a pre-trip inspection, belts should be:
- Left alone and not inspected.
- Checked for tightness. ✓
- Inspected, but only about once a month.
Answer: B. Checked for tightness.
Belts should be checked for tightness during a pre-trip inspection. The handbook tells you to learn how to check v-belt tightness by pressing on the belts. It explains that loose belts will not turn the water pump and/or fan properly, which leads to overheating. It also says to look at the belts for cracking or other signs of wear. That is why checking tightness belongs in the inspection, and why leaving belts unchecked or inspecting them only now and then does not match the handbook's guidance.
3. If the emergency air line loses pressure:
- The Anti-Lock Braking System will activate.
- The service air line will activate.
- The emergency brakes will activate. ✓
Answer: C. The emergency brakes will activate.
If the emergency air line loses pressure, the emergency brakes will activate. The emergency line does two jobs: it supplies air to the trailer tanks and it controls the trailer emergency brakes. When pressure in that line drops, the trailer emergency brakes come on. The handbook also notes that a major leak in the emergency line can close the tractor protection valve and apply the trailer emergency brakes. The Anti-Lock Braking System and the service line are not described as activating because the emergency line lost pressure.
4. What color light indicates a vehicle's ABS is not working?
- Green
- Blue
- Yellow ✓
Answer: C. Yellow
The light that indicates a vehicle's ABS is not working is yellow. The handbook says ABS-equipped vehicles use yellow malfunction lamps. On a bus, the yellow ABS lamp is on the instrument panel and comes on briefly at start-up for a bulb check, then should go out. If it stays on after that check, or comes on once you are driving, it can mean ABS control has been lost at one or more wheels. That makes yellow the warning color for an ABS problem, not green or blue.
5. When coupling a trailer:
- Make sure to couple matching glad hands. ✓
- Any glad hand can be connected to any other glad hand.
- It is best to leave one glad hand unattached.
- Only one set of glad hands should be connected.
Answer: A. Make sure to couple matching glad hands.
When coupling a trailer, make sure the proper glad hands are paired together. The handbook describes glad hands as the couplers that join the service and emergency air lines. It says to clean the seals first, then make sure the correct couplers go together. It also notes color coding and tags as aids, with red for emergency and blue for service. The coupling procedure separately says to connect the tractor emergency line to the trailer emergency glad hand and the service line to the trailer service glad hand. Matching the right lines is what this answer is asking for.
6. Placarded vehicles must carry fire extinguishers with a minimum rating of:
- 10 B:C. ✓
- 20 C.
- 10 A:B.
- 5 B:C.
Answer: A. 10 B:C.
Placarded vehicles must carry a fire extinguisher rated at least 10 B:C. The handbook says the power unit of a placarded vehicle must have a fire extinguisher with a UL rating of 10 B:C or more. That makes 10 B:C the minimum rating, not just one possible choice. The driving-safely section also describes B:C extinguishers as made for electrical fires and burning liquids, which fits the kind of hazard the rule addresses. So the correct choice is the one giving 10 B:C.
7. Overloading a vehicle with cargo:
- Usually has no effect on the vehicle.
- Can impact the vehicle's steering and brake control. ✓
- Can impact the vehicle's electrical system.
Answer: B. Can impact the vehicle's steering and brake control.
Overloading a vehicle can impact the vehicle's steering and brake control. The handbook says plainly that overloading can have bad effects on steering, braking, and speed control. It also notes that steering can be affected by how a vehicle is loaded, making it harder to control. Stopping distance grows, and brakes can fail when they are forced to work too hard. So the safe answer ties overloading to steering and brake control, not to anything electrical.
8. If the air pressure warning light comes on, you should:
- Continue to drive normally.
- Drive with one foot on the accelerator and one foot on the brake pedal.
- Call the local law enforcement agency.
- Safely exit the roadway and stop. ✓
Answer: D. Safely exit the roadway and stop.
Safely exit the roadway and stop. The handbook says the low air pressure warning light and buzzer should come on before pressure drops below 55 psi in either system. If that happens while you are driving, you should stop right away and safely park the vehicle. It also warns that when one air system is very low, either the front or rear brakes will not work fully, so stopping takes longer. Bring the vehicle to a safe stop and have the air brake system fixed.
9. When operating a vehicle with a dual brake system, a driver should:
- Let the vehicle warm up before driving to ensure that fuel reaches the engine.
- Wait to begin driving until the air compressor builds up a minimum pressure of 100 psi in both the primary and secondary systems. ✓
- Begin driving just after the vehicle starts.
- Pump the pedal about 20 times to build pressure, then begin driving.
Answer: B. Wait to begin driving until the air compressor builds up a minimum pressure of 100 psi in both the primary and secondary systems.
You should wait to begin driving until the air compressor builds a minimum pressure of 100 psi in both the primary and secondary systems. The handbook says that before driving a vehicle with a dual air system, give the air compressor time to build at least 100 psi in both the primary and secondary systems. It also says to watch both pressure gauges and the low air pressure warning. That check confirms both halves of the brake system have enough air before you move. The passages do not connect this step to warming up the engine or pumping the pedal.
10. When lightly loaded, combination vehicles:
- Should not be driven.
- Have reduced braking capabilities. ✓
- Will not rollover.
- Should be loaded with most of the weight in the rear of the trailer.
Answer: B. Have reduced braking capabilities.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook