CDL Study Guide ( Updated 2024 ) Complete Questions & Answers (Solved) 100% Correct
- What is the most important reason for doing a vehicle inspection?
Answer: Safety. Safety for yourself and other road user.
- What things should you check during a trip?
Answer: Watch gauges, mirrors, use your senses to check for problems. Look, listen, and smell. Check critical items when you stop; tires, wheels, and rims ; brakes, lights and reflectors; brake and electrical connections to trailer. trailer coupling devices. Cargo securement devices.
- Name some key steering system parts.
Answer: Control arm, steering shaft, pitman arm, steering wheel, hydraulic fluid reservoir
- Name some suspension system defects
Answer: Spring hangers that allow movement of axle from proper position, cracked or broken spring hangers, missing or broken leaves in any leaf spring. If one-fourth or more are missing, it will put the vehicle out of service. Any defect could be dangerous.
- What three kinds of emergency equipment must you have?
Answer: Fire extinguish- er, spare electrical fuses , warning devices for parked vehicles. ( three reflective triangles, and at least 6 fuses or 3 liquid burning flares).
- What is the minimum tread depth for front tires? For other tires?
Answer: 4/32 inch on every major groove of front tires. 2/32 on other tires. No fabric should show through the side wall or tread
- Name some things you should check on the front of your vehicle during the walk around
inspection Answer: Clean glass, Clean and secure mirrors, door latches or locks work, condition of tire rims and tires, tight lug nuts, hub oil level is between the add and full mark, no leaks, springs, shock absorbers, front axle, steering system condition, condition of brakes, spare tire.
- What should wheel bearing seals be checked for?
Answer: Hub oil level and no leaks
- How many red reflective triangles should you carry?
Answer: Three
- How do you test hydraulic brakes for leaks?
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Answer: Pump the brake pedal three times, then apply firm pressure to the pedal and hold for five seconds. The pedal should not move.
- Why put the starter switch key in your pocket during the vehicle inspection?
Answer: For your safety
- Why should you back toward the driver's side?
Answer: So you can see better. Backing toward the right side or "blind side" is very dangerous because you can't see as well.
- If stopped on a hill, how can you start moving without rolling back?
Answer: Partly engage the clutch before taking foot off the brake. Put on the parking brake whenever necessary. Release the parking brake when you have applied enough engine power to keep from rolling back.
- When backing, why is it important to use a helper?
Answer: There are blind spots you cannot see
- What is the most important hand signal that you and the helper should agree on?
Answer: Agree on a signal for stop most importantly.
- Retarders keep you from skidding when the road is slippery. True or false?-
Answer: False
- What are the two ways to know when to shift?
Answer: Use engine speed (rpm) or road speed (mph)
- When preparing to do a pre-trip inspection you must check to see that the parking brakes
are on and/or chocked
Answer: True
- When getting in to start the engine and inspect inside of the cab you must?
Answer: Make sure the parking brake is on, Put the gearshift in neutral (or park if automatic).Start engine and listen for unusual noises.
- Look at the gauges- the oil pressure gauge should come up to normal within how long
after starting the engine?
Answer: Within seconds
- You should check the following for looseness, sticking, damage or improper settings.
Answer: the steering wheel, accelerator, brake and clutch pads
- After inspecting mirrors and windshields for cracks, dirt, illegal stickers or other
obstructions to see, you should...
Answer: Clean and adjust as necessary
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- When checking lights you should...
Answer: Make sure that the parking brake is set, turn off the engine and take the key with you, turn on the headlights and four way flashers
- What is the proper way to hold the steering wheel?
Answer: Firmly with both hands on opposite sides of the wheel.
- What are two special conditions where you should down shift
Answer: Before starting down a hill and before entering a curve.
- When should you downshift automatic transmissions
Answer: When going down grades.
- How far ahead should you look?
Answer: Most good drivers look 12 to 15 seconds ahead
- What are two main things to look for ahead?
Answer: Traffic coming onto the highway, into your lane, or turning. Brake lights or turn signals
- What's your most important way to see the sides and rear of your vehicle?-
Answer: Mirrors
- What does "communicating" mean in safe driving?
Answer: Showing other drivers your intentions
- Where should you place reflectors when stopped on a divided highway?-
Answer: 10 feet 100 feet and 200 feet toward the approaching traffic
- What three things add up to total stopping distance?
Answer: Perception distance
- Reaction distance + braking distance. At 55mph it takes 290 feet or 6 seconds.
- If you go twice as fast, will your stopping distance increase by two or four times?
Answer: Four
- Empty trucks have the best braking. True or False?
Answer: FALSE. The brakes, tires, springs, and shock absorbers on heavy vehicles are designed to work best when the vehicle is fully loaded. Empty trucks require greater stopping distances because an empty vehicle has less traction.
- What is hydroplaning?
Answer: Like water skiing, tires lose contact with the road and have little or no traction. You 3 / 4
may not be able to steer or brake. You can regain control by releasing the accelerator and pushing in the clutch.
- What is "Black Ice"?
Answer: A thin layer of ice that is clear enough to see the road through. Any time the temperature is below freezing and the road looks wet, be cautious.
- How do you find out how many seconds of following distance space you have?
- second.
Answer: One second per 10 feet of vehicle length at speeds below 40 mph. At greater speeds add
- If you are driving a 30-foot vehicle at 55 mph, how many seconds of following distance
should you allow?
Answer: Allow at least 4 seconds
- You should decrease your following distance if somebody is following you too closely. True
or False?
Answer: True
- If you swing wide to the left before turning right, another driver may try to pass you on the
right. True or False?
Answer: True.
A following driver may think you are turning left and try to pass you on the right. You may crash into other vehicle as you complete your turn.
- What is a hazard?
Answer: Any road condition or other road user that is a possible danger.
- Why make emergency plans when you see a hazard?
Answer: You will have more time to act if you see hazards before they become emergencies.
- What are some tips to follow so you won't become a distracted driver?
Answer: - Assessing all potential in-vehicle distractions before driving, turn of communication devices, pre-set the radio or air system before travelling.
- How do you use in-vehicle communications equipment cautiously?
Answer: Pull off road while making/receiving call, position cell phone within easy reach, pre- program phone numbers, keep conversations short, don't open phone while in heavy traaffic, road construction, etc. (2.9.2) You are only allowed to touch one button to call.
- How do you recognize a distracted driver?
Answer: Vehicles that may drift over the lane divider, inconsistent speeds,
eating/drinking/smoking, in a conversation
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