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PA CDL Doubles Triples Practice Questions - Pennsylvania CDL Doubles and Triples Endorsement Test Exam
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Question
1
of 25
QUESTION 1 / 25
What Pennsylvania CDL endorsement authorizes a driver to operate double and triple trailers when the underlying CDL class also permits the vehicle?
Choose one answer below.
A
T endorsement
✓
B
N endorsement
✓
C
P endorsement
✓
D
H endorsement
✓
QUESTION 2 / 25
According to PennDOT's CDL test table, how is the Pennsylvania Doubles/Triples endorsement tested?
Choose one answer below.
A
A 20-question knowledge test with no skills test for that endorsement
✓
B
A 70-question test plus a doubles road test
✓
C
A vehicle inspection test only
✓
D
A passenger-style knowledge and skills test
✓
QUESTION 3 / 25
What minimum score must a CDL applicant achieve on each federal CDL knowledge test, including a doubles/triples endorsement knowledge test?
Choose one answer below.
A
60 percent
✓
B
70 percent
✓
C
75 percent
✓
D
80 percent
✓
QUESTION 4 / 25
Under federal CDL rules, which endorsements may appear on a Commercial Learner's Permit?
Choose one answer below.
A
Only H, N, and T
✓
B
Only P, S, and N
✓
C
Only T and H
✓
D
All CDL endorsements if the knowledge tests are passed
✓
QUESTION 5 / 25
Which federal knowledge area is specifically required for a double/triple trailers endorsement?
Choose one answer below.
A
Passenger evacuation commands
✓
B
Proper placement of the heaviest trailer
✓
C
Railroad crossing signal maintenance
✓
D
School bus student loading zones
✓
QUESTION 6 / 25
Where should the heaviest semitrailer normally be placed in a set of doubles?
Choose one answer below.
A
In the rear position
✓
B
Closest to the tractor
✓
C
On the converter dolly only
✓
D
Placement does not affect handling
✓
QUESTION 7 / 25
What is a converter dolly used for in a doubles combination?
Choose one answer below.
A
It converts a semitrailer into the rear trailer by providing an axle and fifth wheel connection
✓
B
It replaces the tractor's fifth wheel
✓
C
It holds only the electrical cable between trailers
✓
D
It removes the need for air brakes on the rear trailer
✓
QUESTION 8 / 25
What component connects a converter dolly drawbar to the rear of the lead trailer?
Choose one answer below.
A
Landing gear crank
✓
B
Pintle hook
✓
C
Kingpin plate
✓
D
Slack adjuster
✓
QUESTION 9 / 25
Before coupling a converter dolly to the rear trailer, what should you do to the rear trailer?
Choose one answer below.
A
Leave it free to roll so it can align itself
✓
B
Secure it with brakes or chocks and check that it is at the correct height
✓
C
Raise the landing gear fully before coupling
✓
D
Open all rear shut-off valves
✓
QUESTION 10 / 25
When coupling to a semitrailer, how should the trailer height compare with the fifth wheel?
Choose one answer below.
A
Slightly lower than the fifth wheel
✓
B
Several inches above the fifth wheel
✓
C
High enough for the kingpin to miss the jaws
✓
D
Height is irrelevant if the air lines are connected
✓
QUESTION 11 / 25
After the converter dolly is coupled to the lead trailer's pintle hook, what should be checked before continuing?
Choose one answer below.
A
That the pintle hook is latched and its safety device is secured
✓
B
That the dolly tires are removed
✓
C
That the rear trailer landing gear is raised
✓
D
That the service line is intentionally left disconnected
✓
QUESTION 12 / 25
What is the safest general order for building a set of doubles?
Choose one answer below.
A
Couple the tractor and first trailer, then position and connect the dolly, then couple the rear trailer
✓
B
Couple the rear trailer to the tractor first, then add the lead trailer
✓
C
Connect all air lines before making any mechanical couplings
✓
D
Raise all landing gear before any coupling is attempted
✓
QUESTION 13 / 25
Why is a visual check of fifth wheel jaws important after coupling the rear trailer to the converter dolly?
Choose one answer below.
A
It confirms the jaws are closed around the kingpin shank
✓
B
It proves the cargo is under the legal weight limit
✓
C
It replaces the need to connect air lines
✓
D
It sets the dolly brake adjustment automatically
✓
QUESTION 14 / 25
What is the purpose of a gentle tug test after coupling a trailer?
Choose one answer below.
A
To confirm the coupling holds before normal movement
✓
B
To warm the trailer tires
✓
C
To drain moisture from the air tanks
✓
D
To test the horn and windshield wipers
✓
QUESTION 15 / 25
Which line should be connected first when charging a trailer air system during coupling?
Choose one answer below.
A
Emergency or supply line
✓
B
Service or control line
✓
C
Electrical cord
✓
D
ABS warning lamp wire only
✓
QUESTION 16 / 25
What are glad hands used for on doubles and triples?
Choose one answer below.
A
Connecting air lines between units
✓
B
Locking fifth wheel jaws
✓
C
Raising landing gear
✓
D
Securing cargo doors
✓
QUESTION 17 / 25
What should you check after connecting glad hands in a doubles combination?
Choose one answer below.
A
Leaks, crossed lines, secure seals, and enough slack for turns
✓
B
Only that both lines are the same color
✓
C
That the lines drag lightly on the roadway
✓
D
That the rear trailer brakes stay permanently applied
✓
QUESTION 18 / 25
How should shut-off valves normally be positioned for air to reach the rear trailer in a set of doubles?
Choose one answer below.
A
Open at the rear of the lead trailer and closed at the rear of the last trailer
✓
B
Closed at the rear of every trailer
✓
C
Open only at the rear of the last trailer
✓
D
Removed from the trailer air system
✓
QUESTION 19 / 25
Why must the electrical cord be connected through the full doubles combination?
Choose one answer below.
A
So lights and electrical warning systems on all units can operate
✓
B
So the fifth wheel can lock automatically
✓
C
So the converter dolly tires inflate
✓
D
So air pressure can reach the rear trailer
✓
QUESTION 20 / 25
What should be done with unused glad hands or line ends after uncoupling?
Choose one answer below.
A
Secure them to dummy couplers or holders to keep dirt and water out
✓
B
Leave them on the ground for visibility
✓
C
Tie them to the landing gear crank
✓
D
Leave the seals exposed so they dry faster
✓
QUESTION 21 / 25
What is the safest surface for uncoupling the rear trailer of a doubles set?
Choose one answer below.
A
Firm, level ground
✓
B
A steep upgrade
✓
C
Soft shoulder gravel
✓
D
A crowned road lane in traffic
✓
QUESTION 22 / 25
Before releasing the rear trailer from the converter dolly, what should be done with the rear trailer landing gear?
Choose one answer below.
A
Lower it until it firmly supports the trailer
✓
B
Raise it fully
✓
C
Remove the crank handle
✓
D
Leave it partly raised to make the trailer easier to move
✓
QUESTION 23 / 25
When uncoupling air lines, which line is normally disconnected first?
Choose one answer below.
A
Service line
✓
B
Emergency line
✓
C
Battery ground cable
✓
D
Trailer light cord before all brake controls are set
✓
QUESTION 24 / 25
Why must you never rely on a converter dolly alone to support the front of an uncoupled semitrailer?
Choose one answer below.
A
The dolly can move or fly up when weight is removed, causing injury or damage
✓
B
The dolly automatically locks the trailer brakes forever
✓
C
The dolly fifth wheel is stronger than landing gear
✓
D
Pennsylvania does not require landing gear on trailers
✓
QUESTION 25 / 25
What should be done before pulling a converter dolly out from under a rear trailer?
Choose one answer below.
A
Confirm the rear trailer is supported, brakes or chocks are set, and lines are disconnected and secured
✓
B
Open the fifth wheel and accelerate sharply
✓
C
Leave the landing gear raised to avoid scraping
✓
D
Disconnect only the electrical cord
✓
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