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Oklahoma CDL Combination Practice Questions - Oklahoma CDL Combination Vehicles Test Exam
Practice mode
Question
1
of 25
QUESTION 1 / 25
Which Oklahoma CDL written test is required for drivers seeking Class A combination-vehicle privileges?
Choose one answer below.
A
The Combination Knowledge written test
✓
B
Use only the trailer hand valve for normal stopping
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 2 / 25
In Oklahoma CDL classification rules, Class A generally means GCWR of 26,001 pounds or more when the towed unit is over what GVWR?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
10,000 pounds
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 3 / 25
What does GCWR stand for?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
Gross Combination Weight Rating
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 4 / 25
What does GVWR stand for?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
Drive at normal speed and correct problems after the trip
✓
D
Gross Vehicle Weight Rating
✓
QUESTION 5 / 25
What minimum score is required on CDL knowledge tests under 49 CFR 383.135?
Choose one answer below.
A
80 percent correct
✓
B
Use only the trailer hand valve for normal stopping
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 6 / 25
Who administers Oklahoma CDL and CLP testing logistics?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Service Oklahoma Driver Services
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 7 / 25
What is a combination vehicle?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
A truck or tractor pulling one or more trailers
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 8 / 25
What extra area must be inspected on a combination vehicle compared with a straight truck?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
Drive at normal speed and correct problems after the trip
✓
D
The coupling area between tractor and trailer
✓
QUESTION 9 / 25
Why must trailer lights be checked after coupling?
Choose one answer below.
A
To confirm other traffic can see trailer clearance, turns, brake lights, and hazards
✓
B
Use only the trailer hand valve for normal stopping
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 10 / 25
Before driving, what should be true of the landing gear?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
It is fully raised and the handle is secured
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 11 / 25
Which trailer tire condition is unsafe?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
A flat tire, exposed cord, or sidewall damage
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 12 / 25
Before backing under a trailer, what position should the fifth wheel locking jaws be in?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
Drive at normal speed and correct problems after the trip
✓
D
Open and ready to receive the kingpin
✓
QUESTION 13 / 25
How should the tractor be aligned for coupling?
Choose one answer below.
A
Directly in front of and centered with the trailer kingpin
✓
B
Use only the trailer hand valve for normal stopping
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 14 / 25
What is the kingpin?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
The vertical trailer pin that locks into the fifth wheel
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 15 / 25
What is the fifth wheel?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
The tractor coupling plate and locking assembly that receives the kingpin
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 16 / 25
How is a tug test performed after coupling?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
Drive at normal speed and correct problems after the trip
✓
D
Set trailer brakes and gently pull forward in low gear
✓
QUESTION 17 / 25
After coupling and final checks, what should be done with wheel chocks?
Choose one answer below.
A
Remove and stow them before moving
✓
B
Use only the trailer hand valve for normal stopping
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 18 / 25
Why should you back slowly in low gear while coupling?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
To maintain control and avoid striking the trailer hard
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 19 / 25
Why should you uncouple on firm, level ground when possible?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
To support the landing gear and reduce trailer movement
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 20 / 25
Before uncoupling, what must be done to the trailer?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
Drive at normal speed and correct problems after the trip
✓
D
Secure it so it cannot roll
✓
QUESTION 21 / 25
When should landing gear be lowered during uncoupling?
Choose one answer below.
A
Before pulling the tractor out from under the trailer
✓
B
Use only the trailer hand valve for normal stopping
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 22 / 25
What should be done with disconnected air lines and the electrical cord?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Secure them on dummy couplers or storage hangers
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 23 / 25
What color is commonly used for the trailer emergency or supply glad-hand?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
Red
✓
D
Drive at normal speed and correct problems after the trip
✓
QUESTION 24 / 25
What color is commonly used for the trailer service glad-hand?
Choose one answer below.
A
Use only the trailer hand valve for normal stopping
✓
B
Skip the visual inspection if the vehicle moves during a tug test
✓
C
Drive at normal speed and correct problems after the trip
✓
D
Blue
✓
QUESTION 25 / 25
What does the trailer service line do?
Choose one answer below.
A
Carries service-brake application air to the trailer brakes
✓
B
Use only the trailer hand valve for normal stopping
✓
C
Skip the visual inspection if the vehicle moves during a tug test
✓
D
Drive at normal speed and correct problems after the trip
✓
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