Download CDL (Basic Knowledge + Air Brakes) Exam: Questions and Answers and more Exams Mechanical Engineering in PDF only on Docsity!
CDL (BASIC KNOWLEDGE + AIR
BRAKES) EXAM WITH CORRECT
ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED
ANSWERS LATEST 2025 ALREADY
GRADED A+
Why put the starter switch key in your pocket during the pre-trip
inspection? - Correct Ans: ✅To prevent someone from moving the truck while you aren't in it and for safety
Why should you back toward the driver side? - Correct Ans: ✅So you can see better
If stopped on a hill, how can you start moving without rolling back? -
Correct Ans: ✅Partly engage the clutch before you take your right foot off the break. Put on the parking break whenever necessary to keep from rolling back. Release the parking break only when you have a plied enough engine power to keep from rolling back
When backing why is it important to use a helper? - Correct Ans:
✅There are blind spots you cannot see
What is the most important hand signal that you and the help we
should agree on? - Correct Ans: ✅Stop
What are two special conditions where you should downshift? -
Correct Ans: ✅Before starting down a hill, before entering a curve
When should you downshift automatic transmissions? - Correct Ans:
✅When going down grades
Retarder's keep you from skating when the road is slippery, true or
false? - Correct Ans: ✅Falls-retarder's helps lower vehicle reducing the need for using your brakes
What are the two ways to know when to shift? - Correct Ans:
✅Used engine speed (RPM) or use road speed (MPH)
How far ahead does the manual say you should look? - Correct Ans:
✅12 to 15 seconds ahead
What are the two main things to look for ahead? - Correct Ans:
✅Vehicles coming onto the highway and road conditions
What is your most important wait to see the sides and rear of your
vehicle? - Correct Ans: ✅Mirrors
What does"communicating" mean in safe driving? - Correct Ans:
✅Letting other drivers know you are there to prevent accidents
You should decrease your following distance of some body is
following you too closely. True or false? - Correct Ans: ✅False
If you swing wide to the left before turning right, another driver may
try to pass you on the right. True or false? - Correct Ans: ✅True
What is a hazard? - Correct Ans: ✅Any road condition or other road users that is a possible danger
Why make emergency plans when you see a hazard? - Correct Ans:
✅To be prepared, improve your own safety as well as the safety of all road users
What are some tips to follow so you won't become a distracted
driver? - Correct Ans: ✅-Review and be totally familiar with all safety and usage features on any in vehicle electronics, including your wireless or cell phone, before you drive
-pre-program radio stations
-preload CDs or cassette tape's
-clear vehicle of any unnecessary objects
-review maps and plan your route before you begin driving
-it just all mirrors for best all around visibility before you start your trip
-don't attempt to read or write while you drive
-avoid smoking, eating, and drinking while you are driving
-don't engage in complex or emotionally intense conversations with other occupants
How do you use in vehicle communications equipment cautiously? -
Correct Ans: ✅-One possible pull off the road in a safe and legal place when making or receiving a call on communication equipment
-if possible turn the cell phone off until your destination is reached
-pre-program the cell phones with commonly called numbers
-if you have to place a call, find a safe place to pull off the road. Do not place a call while driving
-NYS vehicle and traffic Law requires that all my hands-free devices can be used while driving. Even these devices are unsafe to use when you are moving down the road
-if you must use your cell phone keep conversation short, develop ways to get free of long winded friends and associates while on the road, never use the cell phone for social visiting
-hang up in tricky traffic situations
Do not use the equipment when approaching locations with heavy traffic, road construction, heavy pedestrian traffic, or severe weather conditions
-do not attempt to read or type messages on your satellite system while you are driving
How do you recognize a distracted driver? - Correct Ans: ✅-vehicles that may drift over the lane divider or within their own lane
-vehicles traveling at inconsistent speeds
What are some things you can do to reduce your stress before and
while you drive? - Correct Ans: ✅-listen to "easy listening "music
-give the driver your full attention, don't allow yourself to become distracted by talking on the phone, eating, etc.
-be realistic about your travel time. Expect delays because of traffic, construction, or bad weather and make allowances
-if you are going to be later than you expected-deal with it-take a deep breath and except the delay
-give other drivers the benefit of the doubt. Try to imagine why he/she is driving that way. Remember it has nothing to do with you
-slow down and keep your following distance reasonable
-don't drive slowly in the left lane
-avoid gestures
-be a cautious and courteous driver, (be my guest)
You should use will beans whenever you can. True or false? - Correct
Ans: ✅False
What should you do before you drive if you are drowsy? - Correct
Ans: ✅Pull off the road safely and get some sleep
What affects can wet brakes cause? How can you avoid these
problems? - Correct Ans: ✅-what breaks can cause the brakes to be weak, to apply on evenly, or to grab, which can cause lack of breaking power, and jackknifing if you pull a trailer
-avoid driving through deep puddles or flowing water if possible
-slow down and place the transmission in low gear
-gently put on the brakes
-increase engine RPM and cross the water while keeping light pressure on the brakes
-when out of water maintain light pressure on the brakes for a short distance to allow them to heat up and dry out
-make a safe test stop
You should've let air out of Hot tire so the pressure goes back to
normal. True or false? - Correct Ans: ✅False
You can safely remove the radiator cap as long as the engine isn't
heated. True or false - Correct Ans: ✅True
What factors determine your selection of a "safe" speed , when
going down a lob , steel downgrade? - Correct Ans: ✅-total weight of the vehicle and cargo
-length of the downgrade
-steepness of the downgrade
-road conditions
-weather
Why should you be in the proper gear before starting down a hill? -
Correct Ans: ✅You will not be able to shift into a lower gear. You may not even be able to get back into any gear and all engine braking affect will be lost
What is an "escape ramp"? - Correct Ans: ✅It is designed to protect vehicles from damage
If a tire blows out you should put the brakes on hard to stop quickly.
True or false? - Correct Ans: ✅False
How do you know if your vehicle has antilock brakes? - Correct Ans:
✅Tractors, trucks, and buses will have a yellow ABS malfunction lamps on the instrument panel. Trailers will have a yellow ABS malfunction lamps on the left either on the front or rear corner
What is the proper braking technique when driving a vehicle with
antilock brakes? - Correct Ans: ✅-you've only the brake force necessary to stop safely and stay in control
-Break the same way regardless of whether you have ABS on a bus, tractor, the trailer, or both
-as you slow down monitor your tractor and trailer and back of the brakes (if safe) to stay in control
How do antilock brakes help you? - Correct Ans: ✅Antilock brakes help you avoid wheel lock up and maintain control
What are some things to do at a crashing to prevent another crash? -
Correct Ans: ✅-protect the area
-notify authorities
-care for injured
Name two causes of tire fire - Correct Ans: ✅under inflated tires and duals that touch
What kind of fires is a B:C extinguisher not good for? - Correct Ans:
✅B:C is designed to work on electrical fires and burning liquids only
When using your extinguisher, should you get as close as possible to
the fire? - Correct Ans: ✅No, as far away as possible
Name causes a vehicle fires - Correct Ans: ✅After crashes - spilled fuel, improper use of flares
Tires-Under inflated tires and duals that touch
Electrical system-short circuit due to damaged insulation, loose connections
Fuel-Driver smoking, improper fueling, loose fuel connections
Cargo-flammable cargo, improperly sealed or loaded cargo, poor ventilation
Common medicines for colds can make you sleepy. True or false? -
Correct Ans: ✅True
What should you do if you become sleepy while driving? - Correct
Ans: ✅Stop to find a safe place to sleep, take a nap, avoid drugs
What four things related to cargo or drivers responsible for? -
Correct Ans: ✅1. Inspecting your cargo
2.recognizing overload and poorly balanced weight
3.recheck cargo and securing devices as often as necessary during your trip to keep load secure
- Knowing cargo does not restrict your access to emergency equipment
How often must you stop while on the road to check cargo? -
Correct Ans: ✅-inspect cargo and it's securing devices again within the first 15 miles after beginning a trip
-recheck cargo in securing devices as often as necessary during the trip to keep load secured
-you need to inspect again after you have driven for three hours or 150 miles
-after every break you take during the drive
How is gross combination weight rating different from gross
combination weight? - Correct Ans: ✅Gross combination weight rating is the maximum gross combination weight specified by the manufacturer for a specific combination of vehicles plus it's load. Gross combination weight is the total weight of a powered unit and trailer and cargo
Name two situations where legal maximum weight may not be safe -
Correct Ans: ✅During bad weather and in mountains
What can happen if you don't have enough weight on the front axle?
- Correct Ans: ✅It can make the steering axle weight too late to steer safely, can cause Poor traction, drive wheels may spent easily, during bad weather the truck may not be able to keep going
What is the minimum number of tiedowns for any flatbed load? -
Correct Ans: ✅2, at least one tiedown for every 10 feet of cargo
What is the minimum number of tiedowns for a 20 foot world? -
Correct Ans: ✅ 2
Name the two basic reasons for covering cargo on an open bed -
Correct Ans: ✅To protect people from spilled cargo and to protect cargo from weather
What must you check before transporting A sealed load - Correct
Ans: ✅You cannot inspect a sealed load but you should check that you don't exceed growth weight and axle weight limits
Why must air tanks be drained? - Correct Ans: ✅To drain Moisture and oil out of the tank
What is a supply pressure gauge used for? - Correct Ans: ✅To tell you how much air is in the air tank
How can you check the slack adjuster? - Correct Ans: ✅Park on level ground, turn off parking brakes, pull hard on each slack adjuster it shouldn't move more than 1 inch
How can you test the low pressure warning signal? - Correct Ans:
✅Shut off the engine with enough air pressure, turn on the electrical power and stepped on and off of the brake pedal until the low air pressure warning signal comes on
How can you check that the spring brakes come on automatically? -
Correct Ans: ✅Step on and off of the break with the engine off the parking brake knob should pop out when air pressure falls between 20 to 40 PSI
What are the maximum leakage rate? - Correct Ans: ✅Less then 2 PSI in one minute for single vehicles and less than 3 PSI in one minute for combination vehicles
Why should you be in the proper gear before starting down a hill? -
Correct Ans: ✅So you only have to apply the break just hard enough to feel a definite slow down
What factors can cause breaks to fade or fail? - Correct Ans:
✅Overheating, low air pressure and not relying on the engine braking affect
The use of breaks on the long steep downgrade is only a supplement
to the breaking of fact of the engine. True or false? - Correct Ans:
✅True
If you are away from your vehicle only a short time you do not need
to use the parking brake. True or false? - Correct Ans: ✅False
How often should you drain your air tanks? - Correct Ans: ✅Daily
You still have normal break functions if your ABS is not working. True
or false? - Correct Ans: ✅True
How do you break when you drive a tractor-trailer combination with
ABS? - Correct Ans: ✅-use only the braking force necessary to stop safely and stay in control
-Break the same way regardless of whether you have ABS on the tractor, trailer or both
-as you slow down, monitor your tractor and trailer and back off The brakes (if safe) to stay in control
What is the most important reason for doing vehicle inspection? -
Correct Ans: ✅Safety
What thing should you check during a trip? - Correct Ans: ✅Tires, wheels, rims, brakes, lights, reflectors, broken electrical connections to trailer, trailer coupling devices, cargo securement devices
What should we owe bearing seals be checked for? - Correct Ans:
✅That they are not leaking
How many red reflective triangles should you carry? - Correct Ans:
✅Three
How do you test hydraulic brakes for leaks? - Correct Ans: ✅Pump the brake pedal three times then apply firm pressure to the pedal and hold for five seconds. The pedal should not move
