CDL Exam
Questions And Answers
2023
What's the most important reason for doing a vehicle inspection? - Answer-Safety
What things should you check
... [Show More] during a trip? - Answer-instruments, air pressure gauges,
temperature gauges, pressure gauges, voltmeter, mirrors, tires, cargo
Name some key steering system parts. - Answer-gear box, tie rods, steering column
Name some suspension system defects. - Answer-1/4 or more of leaves in spring
assembly are broken; any leaf is missing; spring hangers that allow movement of axle
from proper position; leaking shock absorbers
What 3 kinds of emergency equipment must you have? - Answer-spare electrical fuses,
3 red reflective triangles, properly charged & rated fire extinguisher
What is the minimum tread depth for front tires? - Answer-4/32"
What is minimum tread depth for other tires? - Answer-2/32"
Name some things you should check on the front of your vehicle during the walk-around
inspection. - Answer-condition of: front axle, steering system, windshield; lights &
reflectors; parking, clearance & identification lights clean, operating & proper color;
reflectors clean & proper color; right front turn signal clean, operating & proper color
What should wheel bearing seals be checked for? - Answer-That they're not leaking
How many red reflective triangles should you carry? - Answer-3
How do you test hydraulic brakes for leaks? - Answer-Pump brake pedal 3X, then apply
firm pressure to pedal & hold for 5 seconds. The pedal shouldn't move. It it does, there
may be a leak or other problem.
Why put the starter switch key in your pocket during the pre-trip inspection? - AnswerTo ensure that no one can start or move the vehicle while you're performing your
inspection.
Why should you back toward the driver's side? - Answer-So you can see better. Backing
toward the right side is very dangerous because you can't see as well. If you back &
turn toward driver's side, you can watch the rear of your vehicle by looking out the side
windows.
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 parking brake whenever
necessary to keep from rolling back. Release parking brake only when you have applied
enough engine power to keep from rolling back. Speed up slowly & gradually so vehicle
doesn't jerk.
When backing, why is it important to use a helper? - Answer-There are blind spots you
can't see.
What's the most important hand signal that you and the helper should agree on? -
Answer-Stop
What are the 2 special conditions where you should downshift? - Answer-Before starting
down a hill & before entering a curve.
When should you downshift automatic transmissions? - Answer-When going down
grades.
Retarders keep you from skidding when the road is slippery. True or false? - Answer-F
What are the 2 ways to know when to shift? - Answer-Use engine speed (rpm) & use
road speed.
How far ahead does the manual say you should look? - Answer-12-15 seconds ahead
What are 2 main things to look for ahead? - Answer-For vehicles coming onto highway,
into your lane, or turning. Watch for brake lights from slowing vehicles.
What's your most important ways to see the sides and rear of your vehicle? - AnswerCheck your mirrors for vehicles on either side of you and in back of you.
What does "communicating" mean in safe driving? - Answer-Signaling your intentions &
communicating your presence.
Where should your reflectors be placed when stopped on a divided highway? - Answer10', 100' & 200' toward the approaching traffic (behind the vehicle).
What 3 things add up to a total stopping distance? - Answer-perception distance,
reaction distance & braking distance
If you go twice as fast, will your stopping distance increase by 2X or 4X? - Answer-4X
Empty trucks have the best braking. True or false? - Answer-F
What is hydroplaning? -
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