E
.
Learndmv
DMV PRACTICE
Toggle navigation
Find your state
Exam types
Practice tests
Sign in
Create account
↗
← Leave quiz
California CDL Combination Vehicles Test Practice Questions - California Commercial Driver License Combination Vehicles Test Exam
Practice mode
Question
1
of 25
QUESTION 1 / 25
Which California CDL class is generally required for a tractor-semitrailer combination with GCWR at least 26,001 pounds and a trailer over 10,000 pounds GVWR?
Choose one answer below.
A
Noncommercial Class C
✓
B
Commercial Class C
✓
C
Motorcycle Class M1
✓
D
Commercial Class A
✓
QUESTION 2 / 25
Who needs the Combination Vehicles knowledge test in the CDL process?
Choose one answer below.
A
Only motorcycle applicants
✓
B
All passenger-car applicants
✓
C
Applicants seeking Group A or Class A combination-vehicle authority
✓
D
Only drivers renewing a Class C license
✓
QUESTION 3 / 25
What minimum score is required on each CDL knowledge test under 49 CFR 383.135?
Choose one answer below.
A
60 percent correct
✓
B
80 percent correct
✓
C
70 percent correct
✓
D
A score set by the training school
✓
QUESTION 4 / 25
Before applying for the California CDL skills test, how long must an applicant hold the CLP?
Choose one answer below.
A
At least 14 days
✓
B
At least 24 hours
✓
C
Exactly 30 days
✓
D
No minimum holding period
✓
QUESTION 5 / 25
What trailer part locks into the fifth wheel jaws?
Choose one answer below.
A
The trailer marker lamp
✓
B
The landing gear crank
✓
C
The service glad hand
✓
D
The kingpin
✓
QUESTION 6 / 25
What is the fifth wheel used for on a tractor-semitrailer?
Choose one answer below.
A
It powers the trailer lights
✓
B
It inflates the trailer tires
✓
C
It supports and locks the semitrailer kingpin to the tractor
✓
D
It drains trailer air tanks
✓
QUESTION 7 / 25
What does a tug test verify after coupling?
Choose one answer below.
A
The trailer doors are painted correctly
✓
B
The kingpin is held by the fifth wheel lock
✓
C
The fuel tanks are full
✓
D
The cargo paperwork is complete
✓
QUESTION 8 / 25
What is a high coupling?
Choose one answer below.
A
The kingpin is not properly seated in the fifth wheel jaws, often riding above closed jaws
✓
B
The trailer load is stacked neatly
✓
C
The landing gear is fully raised
✓
D
The trailer lights are mounted high
✓
QUESTION 9 / 25
Which glad hand color normally identifies the trailer emergency or supply line?
Choose one answer below.
A
White
✓
B
Blue
✓
C
Green
✓
D
Red
✓
QUESTION 10 / 25
Which glad hand color normally identifies the trailer service line?
Choose one answer below.
A
Yellow
✓
B
Red
✓
C
Blue
✓
D
Orange
✓
QUESTION 11 / 25
What connection powers trailer brake lights, turn signals, and marker lights?
Choose one answer below.
A
The red glad hand
✓
B
The trailer electrical cord or connector
✓
C
The fifth wheel release arm
✓
D
The landing gear gearbox
✓
QUESTION 12 / 25
After coupling and checks, what should be true of the landing gear before driving?
Choose one answer below.
A
It is fully raised and the crank handle is secured
✓
B
It is left touching the road
✓
C
It is removed from the trailer
✓
D
It is halfway down for stability
✓
QUESTION 13 / 25
What supports a semitrailer nose after it is uncoupled?
Choose one answer below.
A
The electrical cord
✓
B
The blue service line
✓
C
The trailer hand valve
✓
D
Landing gear
✓
QUESTION 14 / 25
What does the trailer hand valve apply?
Choose one answer below.
A
Landing gear locks
✓
B
Tractor steering brakes
✓
C
Trailer service brakes only
✓
D
Trailer door latches
✓
QUESTION 15 / 25
Why is the trailer hand valve not a parking brake?
Choose one answer below.
A
It locks the kingpin too tightly
✓
B
Service air can leak away and release the brakes
✓
C
It turns off brake lights
✓
D
It lowers the landing gear
✓
QUESTION 16 / 25
What is off-tracking?
Choose one answer below.
A
Trailer rear wheels follow a shorter inside path than the tractor in a turn
✓
B
Trailer brakes release before tractor brakes
✓
C
The tractor leaves the travel lane on purpose
✓
D
The fifth wheel slides during braking
✓
QUESTION 17 / 25
Why do tractor-trailers often need extra room for right turns?
Choose one answer below.
A
The trailer becomes shorter in right turns
✓
B
The kingpin unlocks in right turns
✓
C
The red glad hand disconnects in right turns
✓
D
Trailer wheels off-track toward the curb
✓
QUESTION 18 / 25
Why do combination vehicles need extra following distance?
Choose one answer below.
A
They cannot use service brakes
✓
B
They stop faster than cars
✓
C
They are longer and heavier and usually need more distance to stop
✓
D
They are exempt from space rules
✓
QUESTION 19 / 25
What load placement helps reduce rollover risk?
Choose one answer below.
A
Stack cargo high on one side
✓
B
Keep cargo low and centered
✓
C
Place all cargo at the rear doors
✓
D
Leave cargo unsecured for flexibility
✓
QUESTION 20 / 25
What should a combination driver do before a sharp curve?
Choose one answer below.
A
Slow before entering the curve
✓
B
Brake hard halfway through the curve
✓
C
Accelerate to reduce off-tracking
✓
D
Use the hand valve to pull the trailer around
✓
QUESTION 21 / 25
What is a jackknife?
Choose one answer below.
A
The trailer follows perfectly straight
✓
B
The trailer landing gear collapses
✓
C
The electrical cord unplugs
✓
D
The tractor and trailer fold sharply toward each other at the coupling
✓
QUESTION 22 / 25
What is the first correction for a trailer skid caused by locked trailer wheels?
Choose one answer below.
A
Pull the trailer air supply knob
✓
B
Apply more trailer hand valve
✓
C
Release the brakes enough to let the wheels roll
✓
D
Steer harder while keeping wheels locked
✓
QUESTION 23 / 25
When unsure of clearance while backing, what should the driver do?
Choose one answer below.
A
Back faster to finish sooner
✓
B
Get out and look before continuing
✓
C
Use only one mirror
✓
D
Set the trailer brakes and accelerate
✓
QUESTION 24 / 25
What should you do if the trailer angle becomes too sharp while backing?
Choose one answer below.
A
Stop and pull forward to straighten
✓
B
Keep backing faster
✓
C
Turn the wheel fully and hope it follows
✓
D
Disconnect the service line
✓
QUESTION 25 / 25
What should be checked on the lower fifth wheel?
Choose one answer below.
A
Fuel cap label
✓
B
Windshield washer level
✓
C
Seat belt color
✓
D
Secure mounting, damage, missing parts, and enough grease
✓
← Previous
0 of 25 answered
Next question →
Finish & see results →