Review Questions - Click On The Picture To Begin...
These Questions Are From The Illinois CDL Manual
- No free play at all
- 1.5 inches of free play
- 1 inch of free play
- 3/4 inch of free play
Quote From Page 116 Of The CDL Manual:
Engine compartment belts: Check the following belts for snugness (up to 3/4-inch play at center of belt), cracks or frays:
- Power steering belt.
- Water pump belt.
- Alternator belt.
- Air compressor belt.
TruckingTruth's Advice:
When checking belts, tell the examiner:
The belt is not cracked, frayed, or broken and free play is between 1/2in and 3/4in."
- Vehicles that have anti-lock brakes have a yellow light near the driver's rear side of the vehicle with the letters ABS stenciled above the light
- If there is a malfunction in the ABS system, a yellow warning lamp will illuminate and stay on
- Once the driver turns on the ignition, a yellow malfunction lamp on the instrument panel will light up, briefly indicating that the vehicle has anti-lock brakes
- All trucks and trailers are required to be equipped with Anti-Lock brake systems
Quote From Page 67 Of The CDL Manual:
Vehicles that have anti-lock brakes have a yellow light near the driver's rear side of the vehicle with the letters ABS stenciled above the light. Once the driver turns on the ignition, a yellow malfunction lamp on the instrument panel will light up, briefly indicating that the vehicle has anti-lock brakes. This lamp will remain constant if there is a malfunction in the anti-lock brake system.
- When the brakes are very hot (i.e. just after coming down a steep grade) wheel chocks should be used instead of the parking brake
- Older vehicles may have a round blue knob for the parking brake in place of the yellow diamond shaped knob currently used in modern equipment
- All of these answers are true
- When there are freezing temperatures and the brakes are very wet, the brake linings may freeze to the brake drums
Quote From Page 68 Of The CDL Manual:
Any time you park, use the parking brakes, except as noted. Pull the parking brake control knob out to apply the parking brakes. Push it in to release them. The control will be a yellow, diamond-shaped knob labeled "parking brakes" on newer vehicles. On older vehicles, it may be a round blue knob or some other shape, including a lever that swings from side to side or up and down.
Do not use the parking brakes if the brakes are very hot (i.e., from just coming down a steep grade), or if the brakes are very wet in freezing temperatures. If the brakes are used when very hot, they can be damaged by the heat. If they are used in freezing temperatures when the brakes are very wet, they can freeze so the vehicle cannot move. Use wheel chocks to hold the vehicle. Let hot brakes cool before using the parking brakes. If the brakes are wet, use the brakes lightly while driving in a low gear to heat and dry them.
If your vehicle does not have automatic air tank drains, drain your air tanks at the end of each working day to remove moisture and oil. Otherwise, the brakes could fail.
Never leave your vehicle unattended without applying the parking brakes or chocking the wheels. Your vehicle might roll away and cause injury and damage
- Emergency shipments of medical drugs or chemicals
- Small-arms ammunition
- All of these can legally be carried on a commercial bus
- Hospital supplies
Quote From Page 56 Of The CDL Manual:
Buses may carry small-arms ammunition, emergency shipments of drugs, chemicals and hospital supplies. You can carry small amounts of some other hazardous materials if the shipper cannot send them any other way.
TruckingTruth's Advice:
Even if you don't plan to obtain a passenger endorsement for your CDL, you will still be required to have a basic understanding of some general rules and regulations for transporting passengers.
- Towards the front of the vehicle.
- Towards the sky.
- It doesn't matter.
- Towards the rear of the vehicle.
Quote From Page 13 Of The CDL Manual:
If a boulder is tapered, point the narrowest end towards the front of the vehicle.
- When you release the brake pedal, the S-cam rotates back, and a spring pulls the brake shoes away from the drum, letting the wheels roll freely again
- All of these answers are accurate
- It is called an S-Cam because it's in the shape of an S
- Forces the brake shoes away from one another and presses them against the inside of the brake drum
Quote From Page 63 Of The CDL Manual:
S-cam brakes: When you push the brake pedal, air is let into each brake chamber (see Figure 5-2). Air pressure pushes the rod out, moving the slack adjuster, thus twisting the brake cam shaft. This turns the S-cam (named because it is shaped like the letter S). The S-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. When you release the brake pedal, the S-cam rotates back, and a spring pulls the brake shoes away from the drum, letting the wheels roll freely again.
TruckingTruth's Advice:
You need to study the different parts of the S-Cam air brake system. Be sure to know the major parts and understand how it works.
- 1990
- 1970
- 1975
- 1985
Quote From Page 74 Of The CDL Manual:
Newer trailers have spring brakes just like trucks and truck tractors. However, converter dollies and trailers built before 1975 are not required to have spring brakes. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank. The emergency brakes come on whenever air pressure in the emergency line is lost. These trailers have no parking brake. The emergency brakes come on whenever the air supply knob is pulled out or the trailer is disconnected. But the brakes will hold only as long as there is air pressure in the trailer air tank. Eventually, the air will leak away, and then there will be no brakes. Therefore, it is very important for safety that you use wheel chocks when you park trailers without spring brakes.
TruckingTruth's Advice:
It is extremely unlikely you will drive a trailer built before 1975, but for the written exam, you still may need to know that trailers built before 1975 were not required to have spring brakes.
- 80% of the cargo weight
- 100% of the cargo weight
- 50% of the cargo weight
- 20% of the cargo weight
Quote From Page 1 Of The CDL Manual:
- The forward force (80% of the cargo weight) represents braking while driving straight ahead.
- The rearward force (50% of the cargo weight) represents vehicle acceleration or braking in reverse.
- The side-to-side or lateral force (50% of the cargo weight) represents traveling on a curve, ramp or changing lanes.
- The vertical force (20% of the cargo weight)) represents cargo vibration during transport. This requirement is satisfied when the cargo is "Fully Contained"
- A device placed on the exposed edge of an article to distribute tiedown forces over a larger area of cargo than the tiedown itself, to protect the tie-down and/or cargo from damage, and to allow the tiedown to slide freely when being tensioned.
- A vertical barrier placed directly behind the cab of a tractor to protect the cab in the event cargo should shift forward.
- A structure, device, or another substantial article placed against an article to prevent it from tipping that may also prevent it from shifting.
- A rail along the side of a vehicle that protects the side of the vehicle from impacts.
Quote From Page 2 Of The CDL Manual:
Edge protector:
A device placed on the exposed edge of an article to distribute tiedown forces over a larger area of cargo than the tiedown itself, to protect the tie-down and/or cargo from damage, and to allow the tiedown to slide freely when being tensioned.
- Primary Line and Secondary Line
- Service Line and Emergency Line
- Parent Line and Child Line
- Red Line and Blue Line
Quote From Page 73 Of The CDL Manual:
Every combination vehicle has two air lines: the service line and the emergency line. They run between each vehicle (tractor to trailer, trailer to dolly, dolly to second trailer, etc.).
TruckingTruth's Advice:
Be sure you understand the difference between the Service Air Line and the Emergency Air Line.
- The Service Air Line controls the service brakes when you use the brake pedal.
- The Emergency Air Line supplies air to the trailer air tanks and the emergency brakes.