CDL Class A License

What is the minimum tread depth for front tires and for other tired?

- 4/32 inch - 2/32 inch

Name 3 causes of vehicle fires.

- After Accidents - Spilled fuel - Improper use of flares

What are the maximum leakage rates?

- Apply 90 psi or more with the brake pedal - After the initial pressure drop, if the air pressure falls more than three psi in one minute for single vehicles (more than four psi for combination vehicles), the air loss rate is too much

What 4 things can happen if you don't have enough weight on the front axle?

- Can make the steering axle weight too light to steer safely. - Can cause poor traction. - Front wheels may spin easily. - During bad weather, the truck may not be able to stop properly

How do you test hydraulic brakes for leaks?

- Check pads or shoes for brake fluid on them - check hoses and reservoir

Name some suspension system defects?

- Cracked or Broken spring hangers - missing or broken leaves - leaking shock absorbers - Air suspension systems broken or leaking

Name 3 causes of vehicle fires from the fuel?

- Driver smoking - Improper fueling - Loose fuel connections

Name 2 situations where legal maximum weights may not be safe.

- During bad weather - In mountains

What 4 things can you use to check that the spring brakes come on automatically?

- Fan off the air pressure by stepping on and off the brake pedal to reduce tank pressure. - The tractor protection valve and parking brake valve should close (pop out) - On a tractor-trailer combination vehicle and the parking brake valve should close (pop out) - On other combination and single vehicle types when the air pressure falls to the manufacturer's specification (20 - 40 psi).

Name 3 causes of vehicle fires from the cargo?

- Flammable cargo - Improperly sealed or loaded cargo - Poor ventilation

How is Gross Combination Weight Rating different from Gross Combination Weight?

- Gross Combination Weight (GCW). The total weight of a powered unit, plus trailer(s), plus the cargo. - Gross Combination Weight Rating (GCWR). The maximum GCW specified by the manufacturer for a specific combination of vehicles plus its load.

How often must you stop while on the road to check your cargo?

- Inspect the cargo and its securing devices before departing and again within the first 50 miles after beginning a trip. - After you have driven for 3 hours or 150 miles. - After every break you take during driving.

What 4 things related to cargo are drivers responsible for?

- Inspecting cargo. - Recognizing overloads and balanced weight. - Cargo is properly secured and does not obscure your view ahead or to the sides. - Cargo does not restrict your access to emergency equipment.

What are 4 things you can do to reduce your stress before and while you drive?

- Listen to easy listening music - Give your drive the full attention - Expect delays - Accept realistic travel time

What 4 things can use to check slack adjusters?

- Park on level ground and chock the wheels to prevent the vehicle from moving. - Release the parking brakes to move the slack adjusters. - Use gloves and pull hard on each slack adjuster that you can reach. - If a slack adjuster moves more than about one inch where the push rod attaches to it, it probably needs adjustment

What 3 things add up to total stopping distance?

- Perception distance - Reaction distance - Braking distance

What are 3 things to do at an accident scene to prevent another accident?

- Protect the area - Notify authorities - Care for injured

What are 4 tips to follow so you won't become a distracted driver?

- Radio - Do not eat or drink - Review maps - Adjust mirrors

Name 2 causes of vehicle fires from the electrical system?

- Short circuits due to damaged insulation - Loose connections

What three things can test the low pressure warning signal?

- Shut the engine off when you have enough air pressure so that the low pressure warning signal is not on. - Turn the electrical power on and step on and off the brake pedal to reduce air tank pressure. - The low air pressure warning signal must come on before the pressure drops to less than 60 psi in the air tank (or tank with the lowest air pressure, in dual.

Name the 2 basic reasons for covering cargo on an open bed.

- To protect people from the cargo - To protect the cargo from the weather

What 5 factors determine your selection of a safe speed when going down a long steep downgrade?

- Total weight - Length of grade - Steepness - Road conditions - Weather

Name 2 causes of tire fires?

- Under inflation - Duals that touch

What 3 thing do you use to brake when you are driving a tractor-trailer combination with ABS?

- Use only the braking force necessary to stop safely and stay in control. - Brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both. - As you slow down, monitor your tractor and trailer and back off the brakes (if it is safe to do so) to stay in control.

How 3 things can you recognize if a driver is distracted?

- Vehicles drifting - Inconsistent speeds - Preoccupied with other tasks

Why should you be in the proper gear before starting down a hill?

- Wont be able to shift into a lower gear - May not even be able to get back into any gear - All engine braking effect will be lost

What are the 8 danger signals of drowsy driving?

- Your eyes close or go out of focus by themselves. - You have trouble keeping your head up. - You can't stop yawning. - You have wandering, disconnected thoughts. - You don't remember driving the last few miles. - You drift between lanes, tailgate, or miss traffic signs. - You keep jerking the truck back into the lane. - You have drifted off the road and narrowly missed crashing.

What are the two ways to know when to shift?

- engine speed - road speed

What are the two main things to look for ahead?

-Traffic - Changing roadways

What three kinds of emergency equipment must you have?

1. Fire extingushiers 2. Spare Eletrical fuses 3. Warning devixes for parked vehicles

Name 7 things you should check on the front of your vehicle during a walk around inspection?

1. Front axle 2. Steering System 3. Windsheild 4. Windshield Wipers 5. Wiper Blades 6. Lights 7. Reflectors

What things should you check during a trip?

1. Instruments 2. Air Pressure Gauge 3. Temperature Gauges 4. Pressure Gauges 5. Ammeter/Voltmeter 6. Mirrors 7. Tires 8.Cargo 9. Lights

What 4 things should wheel bearing seals be check for?

1. Rips 2. Tears 3. Cracks 4. Leaks

Name 7 key steering system parts?

1. Tie Rod 2. Steering Column 3. Gear Box 4. Resevoir 5. Steering Knuckle 6. Draglink 7. Spindle

What is the minimum number of tie-downs for a 20-foot load?

10

Where should your reflectors be placed when stopped on a divided highway?

10' 100' 200' Toward approaching traffic.

How far ahead does the manual say you should look?

12 to 15 seconds ahead.

How many red reflective triangles should you carry?

3

If you are driving a 30 foot vehicle at 55mph how many seconds of following distance should you allow?

4 seconds.

What is an escape ramp?

A detour usually a few miles form the top of a downgrade to stop after brake failure.

What is a dual air brake system?

A dual air brake system has two separate air brake systems, which use a single set of brake controls.

When backing, why is it important to use a helper?

A helper can see things you cannot and help direct your movement.

How do anti-lock brakes help you?

ABS helps you avoid wheel lock up and maintain control.

How do you know if your vehicle has anti-lock brakes?

ABS light should come on during the bulb check.

What is the difference between aggressive driving and road rage?

Aggressive is rude and Road rage intends harm to others.

What is a hazard?

Any road condition or road user that is a possible danger.

If stopped on a hill how can you start moving without rolling back?

Apply the parking brake or apply the accelerator until you move forward.

What is a hazardous materials placard?

Are signs put on the outside of a vehicle that identify the hazard class of the cargo and they are at least 10 3/4 inches square, turned upright on a point, in a diamond shape.

Why should you be in the proper gear BEFORE starting down a hill?

Because gravity can cause the speed of your vehicle to increase.

What is the proper braking technique if your vehicle has anti-lock brakes?

Brake as you always have and use only the brake force that is necessary.

What is "sleep debt"?

Depriving yourself of necessary sleep.

How often should you drain air tanks?

Drain your air tanks at the end of each working day.

Empty trucks have the best breaking?

False

True or False Coffee and a little fresh air will help a drinker sober up?

False

True or False If you are away from your vehicle only a short time, you do not need to use the parking brake.

False

True or False Retarders keep you from skidding when the road is slippery?

False

True or False You can safely remove the radiator cap as long as the engine is not overheated?

False

True or False You should use low beams whenever you can.

False Dim your lights with 500 feet of any vehicle.

True or False When using your extinguisher, should you get as close as possible to the fire.

False Stay far away as possible and aim at the base of the fire.

True or False If a tire blows out, you should put the brakes on hardtop and stop quickly?

False Stay off of the brake.

True or False You should decrease your following distance if somebody is following to closely?

False. You should increase the distance.

How do you use In Vehicle Communications equipment cautiously?

Find a place to pull over and keep conversations short.

What kinds of fires is a B:C extinguisher not good for?

Fires in combustable metals Wood, paper, and ordinary combustable

If you go twice as fast, will your stopping distance increase by two or four times?

Four

What should you do before you drive if you are drowsy?

Getting off the road is the only safe thing do.

What are two so special conditions where you should downshift?

Going into a downgrade or curve.

What factors can cause brakes to fade or fail?

Heat can caused brakes to fade or fail by excessive use of the service brakes.

What is black ice?

Ice thing enough to see the road beneath.

Why must air tanks be drained?

Keep oil and water build up in the air tanks which can freeze in cold weather and cause brake failure.

What type of vehicles can get stuck on a railroad-highway crossing?

Low slung units (lowboy, car carrier, moving van, possum-belly livestock trailer). Single-axle tractor pulling a long trailer with its landing gear set to accommodate a tandem-axle tractor.

What should you do when confronted with an aggressive driver?

Make every attempt to get out of there way.

What is your most important way to see the sides snd rear of your vehicle?

Mirrors

How long does it take for a typical tractor trailer unit to clear a double track?

More than 15 seconds.

What is the minimum number of tie-downs for any flat bed load?

No matter how small the cargo, it should have at least two tie-downs.

When should you downshift automatics transmissions?

On a downgrade or or curve.

Why are placards used?

Placards are used to warn others of hazardous materials you are carrying.

Describe the proper braking technique when going down a long steep downgrade?

Press breaks until 5mph below your "SAFE" speed then release and repeat.

What should you do if you become sleepy while driving?

Pull off of the road and find a safe place to sleep.

What's the most important hand signal that you and the helper should agree on?

STOP!!

What is the most important reason for doing a vehicle inspection?

Saftey for yourself and for other road users.

What does communicating mean in safe driving?

Signaling your intentions for your safety and others.

What are the slack adjusters?

Slack Adjusters connected to the push rod that adjusts the brake pads slack.

Why make emergency plans when you see a hazard?

So that you maybe prepared to handle the situation.

Why put the starter switch key in your pocket during the pre-trip inspection?

So there is no risk of the vehicle rolling or being cracked during the inspection.

What are some advantages of going right instead of left around an obstacle?

So you will not force any other drivers off the road or cause a collision.

What are spring brakes?

Spring brakes are brakes that power is derived through strong mechanical springs. (Emergency and Parking brakes are spring brakes.) (Spring brakes will usually apply between 20-40 PSI)

What is a supply pressure gauge used for?

Supply pressure gauges tell you how much pressure is in the air tanks.

What must you check before transporting a sealed load?

That it doesnt exceed gross weight and axle weight limit.

True or False All vehicles with air brakes must have a low pressure warning signal.

True

True or False Common medicines for colds can make you sleepy?

True

True or False Front wheel brakes are good under all conditions.

True

True or False You should not let air our of hot tires so the pressure goes back to normal.

True

True or False The use of brakes on a long, steep downgrade is only a supplement to the braking effect of the engine.

True

True or False Stopping is not always the safest thing to do in an emergency?

True You may have to steer away from whats ahead.

If you swing wide to left before turning right, another driver might try to pass you on the right.

Turn wide during the turn.

How do you know if your vehicle is equipped with anti-lock brakes?

Vehicles with ABS have yellow malfunction lamps to tell you if something isn't working. Tractors, trucks will have yellow ABS malfunction lamps on the instrument panel. Trailers will have yellow ABS malfunction lamps on the left side, either on the front or rear corner. Dollies manufactured on or after March 1, 1998 are required to have a lamp on the left side.

How do you find out how many seconds of following distance space you have?

Wait to the vehicle ahead passes a mark then count the seconds until you pass.

What effects can wet brakes cause and how can you avoid these problems?

Weak, uneven, or grabbing brakes and avoid deep or flowing water.

What is hydroplaning?

When tires lose traction across water.

Why should you back towards the drivers side?

You have a better line of sight towards the drivers side.