CDL

what will help a drunk sober up? a. fresh air b. coffee c. time d. a glass of water

c. time

which of the following wheel or rim problems can be hazardous? a. bent lock rings b. welding repairs c. missing clamps d. all of the above

d. all of the above

During your pre-trip test, when examining hoses with the instructor, you need to look for a. a low windshield was fluid level b. frays in the water pump belt c. the location of the dipstick d. puddles on the ground

d. puddles on the ground

why should you complete a post-trip inspection report? a. to impress your boss b. so that you can't be blamed for any subsequent damage c. to prove you finished your trip d. to alert others to safety problems requiring repair

d. to alert others to safety problems requiring repair

what is the maximum amount of play that your steering wheel should have?

10 degrees

The minimum tire tread depth for front front tires is a. 5/32 inch b. 6/32 inch c. 4/32 inch d. 2/32 inch

4/32 inch

If you must stop on a road or the shoulder of a road, you must set out your warning devices within a. 15 minutes b. 10 minutes c. 20 minutes d. 5 minutes

b. 10 minutes

Under which conditions are front wheel brakes good? a. Good weather only b. All weather conditions c. None d. Wet or icy conditions only

b. All weather conditions

Which of the following is NOT a key steering system component? a. Tie rod b. Leaf spring c. Steering shaft d. Gear box

b. Leaf spring

What is the definition of a hazard? a. something you can easily avoid b. a road user or road condition that presents a possible danger c. something you can safely ignore d. something you must stop for

b. a road user or road condition that presents a possible danger

What should you do before you drive if you are drowsy? a. Eat b. Sleep c. Drink coffee d. Exercise

b. sleep

At what measurement is the safety valve USUALLY set to open? a. 200 psi b. 100 psi c. 150 psi d. 250 psi

c. 150 psi

What is the minimum legal tread depth for front tires? a. 1/32 b. 2/32 c. 4/32 d. 6/32

c. 4/32

Do empty trucks have shorter stopping distances than loaded trucks? a. Yes, but only on wet surfaces b. Yes c. No d. It depends on the cargo

c. No

How many tie-downs are required for a 20-foot load? a. 4 b. 1 c.3 d.2

d. 2

In the dark, what is the maximum distance that you can see with high beams? a. 800 feet b. 1,000 feet c. 300 feet d. 500 feet

d. 500 feet

When you start to drive down a steep downgrade, which of the following should influence your choice of speed? a. The steepness of the grade b. The total weight of your vehicle and its cargo c. The road conditions d. All of the above

d. All of the above

Which of the following types of fires should you NOT attempt to extinguish with water? a. Paper b. Tire c. Electrical d. Wood

C. Electrical

How would you check your truck's slack adjusters? a. Use gloves and pull hard on each slack adjuster you can reach b. Accelerate, then brake hard c. Press the brake pedal while listening for any strange noises d. All of the above will work

a. Use gloves and pull hard on each slack adjuster you can reach

If the engine is not overheated, is it completely safe to remove the radiator cap? a. no b. yes c. yes, as long as the radiator isn't damaged d. yes, as long as there is no overflow

a. no

The most important hand signal that you and a helper should agree on is a. "Turn up the music" b. "Stop" c. "Go" d. "Faster"

b. Stop

Your emergency kit does NOT need to include a. spare electrical fuses b. a spare jacket c. warning devices d. a fire extinguisher

b. a spare jacket

You should use low beams whenever you can. a. true b. false

b. false

You should inspect wheel bearing seals for a. tears b. leaks c. twisted axles d. broken leaf springs

b. leaks

Which of the following statements about retarders are correct? a. retarders help slow a vehicle, reducing the need for braking b. when your drive wheel have poor traction, the retarder may cause them to skid c. you should turn the retarder off whenever the road is wet, icy, or snow-covered d. all of the above statements are correct

D. All of the above statements are correct.

the "Heavy Vehicle Formula"?

One second for each 10 feet of vehicle length at speeds below 40 mph adding 1 second for speeds over 40 mph.

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

Place within 10 feet of the front or rear corners to mark the location of the vehicle and 100 feet behind and ahead of the vehicle.

What protects the system from excessive pressure?

The safety valve

How far ahead should you look while driving? a. 12 to 15 seconds b. 10 to 12 seconds c. 5 to 10 seconds d. 7 to 12 seconds

a. 12 to 15 seconds

What is the Gross Combination Weight (GCW)? a. The combined weight of the power unit, trailers, and cargo b. The weight of the power unit plus the cargo c. The combined weight of the power unit and trailers d. The weight of a trailer plus its cargo

a. The combined weight of the power unit, trailers, and cargo

How do brakes work on a long, steep downgrade? a. They work as a supplement to the braking effect of your engine b. Not applicable; no braking effect is involved in a downgrade c. They work as the main braking mechanism d. They work as the main braking mechanism with the engine braking effect as an emergency backup

a. They work as a supplement to the braking effect of your engine

Which of the following is NOT part of the braking process when you're driving a tractor-trailer combination vehicle with an antilock braking system (ABS)? a. You should drive faster so that you will be able to keep the trailer and tractor straight b. Brake the same way no matter what you're driving: a vehicle with ABS, a vehicle with a trailer, or something else c. When you slow down, you should monitor your tractor and trailer and ease off the brakes to keep control d. You should use only the braking necessary to stay safely in control

a. You should drive faster so that you will be able to keep the trailer and tractor straight

which of these is NOT part of the basic method for shifting up? a. Accelerating while pressing the clutch and turning toward the driver's side b. releasing the clutch and pressing the accelerator at the same time c. pushing in the clutch and shifting into a higher gear at the same time d. releasing the clutch

a. accelerating while pressing the clutch and turning toward the driver's side

if your brakes get wet, they may a. apply unevenly b. fall off the vehicle c. start to rust d. do all of the above

a. apply unevenly

When you're driving at 55 mph under good driving conditions, your total stopping distance will be a. at least 419 feet b. at least 353 feet c. at least 236 feet d. at least 300 feet

a. at least 419 feet

Why should you use a helper when your are backing? a. because every truck has blind spots b. to make sure you don't damage your truck c. to check your style of driving d. because it's the law

a. because every truck has blind spots

An antilock braking system (ABS) will a. Keep your wheels from locking when you brake hard b. increase your vehicles stopping power c. let you drive faster d. shorten your stopping distance

a. keep your wheels from locking when you brake hard

What are hazardous material palcards? a. signs put on all sides of a vehicle that identifies the hazard class of the cargo b. Signs put on the back of a vehicle that identifies the hazard class of the cargo c. Signs put on the outside of a vehicle that identifies the hazard class and weight of the cargo d. Signs put on the inside of a vehicle that identifies the hazard class of the cargo

a. signs put on all sides of a vehicle that identifies the hazard class of the cargo

What's the best way to take a curve? a. slow down before the curve and accelerate slightly in the curve b. brake in the curve as needed c. speed up before the curve and slow down in the curve d. slow down before the curve and stay at that speed from then on

a. slow down before the curve and accelerate slightly in the curve

if you are being tailgated, you should do all of the following EXCEPT a. speed up b. increase your following distance c. avoid tricks such as flashing your brake lights d. avoid quick changes

a. speed up

If the air tanks are not drained, a. your brakes may fail because of water freezing b. your left side brake will cease to operate c. you will drive too quickly d. your transmission fluid may drain out

a. your brakes may fail because of water freezing

After the initial drop, the maximum acceptable leakage rates per minute are a. 5 psi for single vehicles and 6 psi for combination vehicles b. 3 psi for single vehicles and 4 psi for combination vehicles c. 5 psi for single vehicles and 10 psi for combination vehicles d. 1 psi for single vehicles and 3 psi for combination vehicles

b. 3 psi for single vehicles and 4 psi for combination vehicles

How can you tell if your vehicle is equipped with an antilock braking system (ABS) a. Check if the vehicle was manufactured after 2010 b. Check if the vehicle was manufactured after 1998 c. Check if the vehicle was manufactured after 2000 d. ABS is still optional

b. Check if the vehicle was manufactured after 1998

Name two situations where legal maximum weighted legal maximum weighted trailers may not be safe to haul? a. It might not be safe while driving in large cities and over bridges b. It might no be safe while driving in bad weather or while driving in the mountains c. It might not be safe while driving through tunnels and over bridges d. It might not be safe while driving at night or during rush hour traffic

b. It might no be safe while driving in bad weather or while driving in the mountains

Why must you pass a knowledge test on air brakes? a. Otherwise, you will not be able to obtain a CDL at all b. Otherwise, you will have to get a CDL with restrictions c. Otherwise, you will only be able to obtain a commercials learners permit d. All trucks have air brakes

b. Otherwise, you will have to get a CDL with restrictions

Which of the following is NOT part of the air brake system? a. Emergency brake system b. Radio signal system c. Service brake system d. Parking brake system

b. Radio signal system

What is the most important reason for doing a vehicle inspection? a. State law requires vehicle inspection b. Safety is the most important reason to inspect your vehicle c. To make sure your lights are working properly d. To check for over inflated tires

b. Safety is the most important reason to inspect your vehicle

Why should you be in proper gear before starting down a hill? a. So you can focus on braking b. You will not be able to shift into a lower gear once you are going down the hill c. To maintain speed d. So you will not damage the transmission

b. You will not be able to shift into a lower gear once you are going down the hill

Which of the following will be true about your brake function if your antilock braking system (ABS) fails? a. It may cause problems with other mechanical systems and possibly pose a huge fire risk b. You will still have normal brake function and will just need to get the ABS repaired soon c. It will slow your truck to a halt and force you to pull over d. You will have no brake function and your truck will be out of control

b. You will still have normal brake function and will just need to get the ABS repaired soon

You don't want to be a distracted driver, so you a. read maps or use your phone only when there are no other vehicles around you b. avoid using your cell phone until you reach your destination c. eat, drink, and smoke only on straight portions of the road d. have all your emotionally difficult conversations in the first hour of driving

b. avoid using your cell phone until you reach your destination

To transport cargo safely, which of the following are you NOT responsible for? a. recognizing possible overloads b. ensuring the freshness of sealed cargo c. making sure that the cargo is properly secured d. inspecting the cargo

b. ensuring the freshness of sealed cargo

Retarders keep you from skidding when the road is slippery. a. true b. false

b. false

Too much weight on the drive axle(s), can cause a hard and heavy steering problems a. true b. false

b. false

You can safely remove the radiator cap as long as the engine isn't overheated a. true b. false

b. false

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

b. four times

Be especially cautious about crossing a double railroad track because a. it's wider than a single track b. there may be more than one train c. there will probably be a flag person there d. trains may be more frequent

b. there may be more than one train

where should your reflectors be placed when stopped on a divided highway? a. 50'/50'/50' b. 100'/50'/50' c. 10'/100'/200' d. 100'/100'/10'

c. 10'/100'/200'

A driver should look _____ ahead of the vehicle while driving a. 2-5 seconds b. 5-10 seconds c. 12-15 seconds d. 15-25 seconds

c. 12-15 seconds

In Pennsylvania, the maximum height of a commercial motor vechile (CMV) is a. 15 feet b. 16 feet 6 inches c. 13 feet 6 inches d. 12 feet

c. 13 feet 6 inches

Which vehicles must have low air pressure warning signals? a. Vehicles built after 2005 must have low air pressure warning signals b. Vehicles built after 2010 must have low air pressure warning signals c. All vehicles with air brakes currently in operation must have low air pressure warning signals d. None; low air pressure warning signals are optional

c. All vehicles with air brakes currently in operation must have low air pressure warning signals

Why should you back toward the driver's side? a. State law requires backing toward the driver's side b. Because it takes less time c. Because you can see better d. So you won't have to look over your passenger

c. Because you can see better

When should you use the parking brake? a. Every time you leave your vehicle for any length of time b. Only in urban areas where there are many other vehicles c. Every time you leave your vehicle, with a few exceptions d. Only if you are away from your vehicle for an extended period of time

c. Every time you leave your vehicle, with a few exceptions

What 3 kinds of emergency equipment should you have? a. Flash light, tire gauge, tire inflation foam b. First aid kit, bandage gauze, pain reliever c. Fire extinguisher, spare electrical fuses, warning devices d. Exterior hazard light, cell phone, wheel chock

c. Fire extinguisher, spare electrical fuses, warning devices

For what time should you schedule your trip? a. When it best fits your social life b. In the middle of the day, when there is the most daylight c. For the hours during which you are normally awake d. In the middle of the night, when there is little traffic

c. For the hours during which you are normally awake

If stopped on a hill, how can you start moving without rolling back? a. Place wheel chock under front wheel b. Place wheel chock under rear wheel c. Partly engage clutch before taking your foot off the brake d. Use your parking brake

c. Partly engage clutch before taking your foot off the brake

Name the two basic reasons for covering cargo on an open-bed trailer? a. To protect people from spilled cargo, and to protect the environment from spilled cargo b. To protect the environment from spilled cargo, and to protect the cargo from the weather c. To protect people from spilled cargo, and to protect the cargo from weather d. To keep cargo secure from possible thieves and to keep cargo a secret

c. To protect people from spilled cargo, and to protect the cargo from weather

What is the best way to test your vehicle's low air pressure warning signal? a. Pump the brakes until the air pressure drops below 30 psi b. Manually let the air out of your brakes and see if the signal comes on c. With the engine off, step on and off the brake pedal to lower the air pressure below 60 psi d. Pump the brakes while your vehicle is fully on

c. With the engine off, step on and off the brake pedal to lower the air pressure below 60 psi

An antilock braking system (ABS) a. increases your normal braking capability b. shortens your stopping distance c. activates when your wheels are about to lock up d. decreases your normal braking capability

c. activates when your wheels are about to lock up

When is it important to downshift automatic transmissions? a. downshift automatic transmissions halfway down a hill b. downshift automatic transmissions at the bottom of a hill c. downshift automatic transmissions before going down a hill d. Never downshift automatic transmissions

c. downshift automatic transmissions before going down a hill

If you are convicted of knowingly using a commercial motor vehicle (CMV) to transport illegal drugs, you will be disqualified from commercial driving for a. 10 years b. 20 years c. life d. 5 years

c. life

What can you do at an accident scene to help avoid another accident? a. Stay in your vehicle and do nothing until help arrives b. Have a drink to calm your nerves c. Set out warning devices to keep other vehicles from running into the accident scene d. leave your vehicle, do nothing, and get to higher ground.

c. set out warning devices to keep other vehicles from running into the accident scene.

You should put the starter switch key into your pocket while you perform the pre-trip inspection because a. it could damage the starting mechanism b. someone could steal the truck c. someone could start and move the truck d. any of the above could occur

c. someone could start and move the truck

The purpose of a supply pressure gauge is a. to warn you only if there is too little air in the tank b. to tell you how hot the air in the tank is c. to tell you how much air is in the tank d. all of the above

c. to tell you how much air is in the tank

Which of the following are true about a dual air brake system? a. One system is called the "primary" system and the other one is called the "secondary" system b. It uses a single set of brake controls c. Usually, one system operates the front axle and the other one operates the rear axle d. All of the above are true

d. All of the above

Which of the following can cause brakes to fade or fail? a. Brakes being out of adjustment b. Not relying enough on engine braking c. Excessive use of the service brakes d. All of the above

d. All of the above

What is the best way to test if your vehicle's spring brakes come on automatically? a. On tractor-trailer vehicles, continue to step on and off the brake pedal until the parking brake valve pops out b. On single vehicles, continue to step on and off the brake pedal until the parking brake valve pops out c. Continue to step on and off the pedal until the manufacturer's low psi specification is met for spring brakes to deploy d. All of the above are correct

d. All of the above are correct

When should you drain your air tanks? a. At the end of the fiscal quarter b. At the end of a trip c. At the end of the month d. At the end of each working day

d. At the end of each working day

What are the 2 special conditions where you should downshift? a. Before stopping and exiting a curve b. Before starting off and driving uphill c. Before shutting engine off and before exiting the vehicle d. Before starting down a hill and before entering a curve

d. Before starting down a hill and before entering a curve

During your pre-trip inspection, you should do which of the following inside the cab? a. secure all loose items b. Turn off unnecessary lights c. Check that you have all your required papers d. Do all of the above

d. Do all of the above

Which of the following should you do before leaving your vehicle unattended? a. Remove the keys b. Set the parking brakes c. Chock the wheels d. Do all of the above

d. Do all of the above

If you are confronted by an aggressive driver, what should you do? a. Call the police from your cell phone if you can do it safely b. Ignore rude gestures and refuse to react negatively c. Avoid eye contact d. Do all of the above

d. Do all of the above.

If you spot a hazard ahead, what should you do first? a. Do nothing until you get closer b. Come to a complete stop as soon as it is safe to do so c. Call emergency services d. Make a contingency plan

d. Make a contingency plan

Which of the following is NOT part of the drum brake? a. Brake drum b. Slack adjuster c. Return spring d. Safety valve

d. Safety valve

What does "communicating" mean in safe driving? a. Using cell phones b. Braking often c. Using your horn d. Signaling your intentions

d. Signaling your intentions

Name some key steering parts a. Tires, rims, lug nuts b. Leaf springs, bellows, eye bolt c. Axle, control arm, pressure plate d. Spindle, tie rod, drag link

d. Spindle, tie rod, drag link

What is "black ice"? a. Very hot slippery tar b. Oil slick on the roadway c. Snow on the roadway d. Thin sheet of clear ice on roadway

d. Thin sheet of clear ice on roadway

It has just reached freezing. Which of the following areas may be slippery? a. a bridge b a wet-looking road c. a shaded area d. all of the above

d. all of the above

Spring brakes are a. brakes that come on automatically on a truck or tractor when the psi drops too low b. not going to take full effect until your psi drops to a certain range, typically 20 to 40 psi c. made up of powerful springs that are held back by air pressure while you are driving d. all of the above

d. all of the above

how often must you stop to check your cargo while on the road? a. after each break you take b. within the first 50 miles c. every three hours or 150 miles d. all of the above

d. all of the above

slack adjusters are a. a part of the air brake system that is used to adjust the brakes b. between the push rod and the S-cam on drum brakes c. between the power screw and push rod on disc brakes d. all of the above

d. all of the above

when you proceed through an underpass, your vertical clearance may be affected by a. packed snow b. repaving of the roadway c. the weight of your load d. all of the above

d. all of the above

The heaviest items in your load should be placed a. as high as possible b. to one side c. whichever way is most convenient d. as low as possible

d. as low as possible

The tractor protective valve a. will close automatically if the air supply drops to a certain level b. provides the air supply for the brake system c. will close if you apply the parking brakes d. does all of the above

d. does all of the above

Which of the following is most likely to cause a tire fire? a. Different makes of tires on different wheels b. Excessive braking c. Driving over the speed limit d. Dual tires that touch

d. dual tires that touch

which is NOT one of the four basic skills that operating a commercial motor vehicle requires? a. accelerating b. steering c. backing safely d. first aid certification

d. first aid certification

If ___________ or more of the leaves in any leaf spring are broken or missing, the vehicle will be put out of service. a. one-third b. one c. one-half d. one-fourth

d. one-fourth

Total stopping distance equals a. braking distance + stopping distance b. reaction distance + braking distance c. reaction distance + viewing distance + braking distance d. perception distance + reaction distance + braking distance

d. perception distance + reaction distance + braking distance

While driving a vehicle with dual tires, you hear a noise that sounds like a tire blowout. However, your vehicles handling seems unaffected. What should you do? a. look in your mirrors to try to spot trouble b. keep driving as usual c. check your tires at the next stop d. stop and check your tires now

d. stop and check your tires now

When parking your vehicle, you should look for a parking space a. with enough room to let you back out b. that is as close as possible to your destination c. into which your vehicle will fit snugly d. that you can pull straight through

d. that you can pull straight through

what is the axle weight? a. the combined weight of all the axles of your vehice b. the combined weight of the power units axles only c. what each axle weighs by itself d. the maximum weight that can be supported by one axle

d. the maximum weight that can be supported by one axle