CDL Test Questions and Answers
Already Passed
What is the maximum allowable blood alcohol concentration (BAC) for a commercial driver?
A) 0.08%
B) 0.06%
C) 0.04%
D) 0.02%
C) 0.04%
What is the primary purpose of the air brakes on a commercial vehicle?
A) To improve fuel efficiency
B...
What is the maximum allowable blood alcohol concentration (BAC) for a commercial driver?
A) 0.08%
B) 0.06%
C) 0.04%
D) 0.02%
✔✔ C) 0.04%
What is the primary purpose of the air brakes on a commercial vehicle?
A) To improve fuel efficiency
B) To provide reliable and effective stopping power
C) To reduce engine wear
D) To increase speed
✔✔ B) To provide reliable and effective stopping power
What should you do if you experience a tire blowout while driving?
A) Accelerate quickly
1
,B) Turn the wheel sharply
C) Maintain a firm grip on the steering wheel, ease off the accelerator, and safely steer to the side
of the road
D) Slam on the brakes
✔✔ C) Maintain a firm grip on the steering wheel, ease off the accelerator, and safely steer to the
side of the road
How often should a driver check the oil level in their vehicle?
A) Every 100 miles
B) Every 500 to 1,000 miles
C) Once a month
D) Only when the oil light comes on
✔✔ B) Every 500 to 1,000 miles
What is the function of the governor in a truck's air brake system?
A) To control the engine speed
B) To regulate the air pressure in the brake system
C) To increase brake fluid levels
D) To adjust the brake pads
2
,✔✔ B) To regulate the air pressure in the brake system
When approaching a railroad crossing, what should a commercial driver do?
A) Speed up to clear the crossing quickly
B) Slow down, look both ways, and proceed only when it is clear and safe to cross
C) Stop only if a train is visible
D) Honk the horn and continue
✔✔ B) Slow down, look both ways, and proceed only when it is clear and safe to cross
How should a driver adjust their mirrors to ensure maximum visibility?
A) Adjust to show only the rear bumper
B) Adjust to minimize blind spots and provide a clear view of the sides and rear
C) Set mirrors to focus only on the road directly ahead
D) Adjust mirrors so they only show the rear-view camera
✔✔ B) Adjust to minimize blind spots and provide a clear view of the sides and rear
What is the proper procedure for making a right turn with a commercial vehicle?
A) Signal and make a sharp turn immediately
3
, B) Signal well in advance, check mirrors and blind spots, and ensure there is enough space to
complete the turn safely
C) Speed up to make the turn quickly
D) Turn without signaling if the road is clear
✔✔ B) Signal well in advance, check mirrors and blind spots, and ensure there is enough space
to complete the turn safely
What is the purpose of the vehicle’s differential?
A) To increase the vehicle’s speed
B) To allow the wheels on the same axle to rotate at different speeds for smooth turns
C) To improve fuel efficiency
D) To enhance the vehicle’s acceleration
✔✔ B) To allow the wheels on the same axle to rotate at different speeds for smooth turns
What should a driver do if they need to stop on a highway?
A) Stop in the middle of the highway
B) Use hazard lights, move the vehicle as far off the road as possible, and set up warning
triangles if necessary
C) Stop only if there is an emergency vehicle behind
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