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NJ CDL Combination Practice Questions - New Jersey CDL Combination Vehicles Test Exam
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Question
1
of 25
QUESTION 1 / 25
Which applicant generally needs New Jersey CDL Combination Vehicles knowledge?
Choose one answer below.
A
A qualifying Class A tractor-trailer applicant
✓
B
Use only the trailer hand valve
✓
C
Ignore it if the tractor feels normal
✓
D
Raise the landing gear halfway
✓
QUESTION 2 / 25
What score is required to pass CDL knowledge tests such as Combination Vehicles?
Choose one answer below.
A
Ignore it if the tractor feels normal
✓
B
Raise the landing gear halfway
✓
C
Rely on ABS to fix the issue
✓
D
80%
✓
QUESTION 3 / 25
Which NJ CDL manual section is the main source for Combination Vehicles knowledge?
Choose one answer below.
A
Rely on ABS to fix the issue
✓
B
Drive faster to straighten the trailer
✓
C
Section 6
✓
D
Raise the landing gear halfway
✓
QUESTION 4 / 25
What is a combination vehicle?
Choose one answer below.
A
Disconnect the electrical cord
✓
B
A truck or tractor pulling one or more trailers
✓
C
Rely on ABS to fix the issue
✓
D
Drive faster to straighten the trailer
✓
QUESTION 5 / 25
Which cargo habit best helps prevent combination-vehicle rollover?
Choose one answer below.
A
Keep cargo low and centered
✓
B
Drive faster to straighten the trailer
✓
C
Disconnect the electrical cord
✓
D
Assume the fifth wheel is locked
✓
QUESTION 6 / 25
What does rearward amplification describe?
Choose one answer below.
A
Disconnect the electrical cord
✓
B
Assume the fifth wheel is locked
✓
C
Use the parking brake while moving
✓
D
Trailer reaction amplified by quick steering
✓
QUESTION 7 / 25
What following-distance rule applies to combination vehicles?
Choose one answer below.
A
Use the parking brake while moving
✓
B
Use only the trailer hand valve
✓
C
1 second per 10 feet, plus 1 over 40 mph
✓
D
Assume the fifth wheel is locked
✓
QUESTION 8 / 25
What should you do if stuck on railroad tracks?
Choose one answer below.
A
Ignore it if the tractor feels normal
✓
B
Get away and call 911 or the posted number
✓
C
Use the parking brake while moving
✓
D
Use only the trailer hand valve
✓
QUESTION 9 / 25
What is off-tracking?
Choose one answer below.
A
Rear wheels track inside the front wheels
✓
B
Use only the trailer hand valve
✓
C
Ignore it if the tractor feels normal
✓
D
Raise the landing gear halfway
✓
QUESTION 10 / 25
How should you manage a tight right turn?
Choose one answer below.
A
Ignore it if the tractor feels normal
✓
B
Raise the landing gear halfway
✓
C
Rely on ABS to fix the issue
✓
D
Turn wide while preventing right-side passing
✓
QUESTION 11 / 25
When backing a trailer, how do you first steer?
Choose one answer below.
A
Rely on ABS to fix the issue
✓
B
Drive faster to straighten the trailer
✓
C
Turn opposite the desired trailer direction
✓
D
Raise the landing gear halfway
✓
QUESTION 12 / 25
Which side is preferred for curved backing?
Choose one answer below.
A
Disconnect the electrical cord
✓
B
Driver side
✓
C
Rely on ABS to fix the issue
✓
D
Drive faster to straighten the trailer
✓
QUESTION 13 / 25
What is the correct response to a trailer skid from locked wheels?
Choose one answer below.
A
Release the brakes
✓
B
Drive faster to straighten the trailer
✓
C
Disconnect the electrical cord
✓
D
Assume the fifth wheel is locked
✓
QUESTION 14 / 25
Why can empty trailers skid more easily?
Choose one answer below.
A
Disconnect the electrical cord
✓
B
Assume the fifth wheel is locked
✓
C
Use the parking brake while moving
✓
D
Less traction makes wheel lockup easier
✓
QUESTION 15 / 25
What is the trailer hand valve used for?
Choose one answer below.
A
Use the parking brake while moving
✓
B
Use only the trailer hand valve
✓
C
Testing trailer brakes
✓
D
Assume the fifth wheel is locked
✓
QUESTION 16 / 25
What does the tractor protection valve protect?
Choose one answer below.
A
Ignore it if the tractor feels normal
✓
B
The tractor air supply
✓
C
Use the parking brake while moving
✓
D
Use only the trailer hand valve
✓
QUESTION 17 / 25
What does pushing in the red trailer air supply control do?
Choose one answer below.
A
Supplies air to the trailer
✓
B
Use only the trailer hand valve
✓
C
Ignore it if the tractor feels normal
✓
D
Raise the landing gear halfway
✓
QUESTION 18 / 25
What are glad hands?
Choose one answer below.
A
Ignore it if the tractor feels normal
✓
B
Raise the landing gear halfway
✓
C
Rely on ABS to fix the issue
✓
D
Air-line couplers
✓
QUESTION 19 / 25
What does the blue service line do?
Choose one answer below.
A
Rely on ABS to fix the issue
✓
B
Drive faster to straighten the trailer
✓
C
Carries service-brake control air
✓
D
Raise the landing gear halfway
✓
QUESTION 20 / 25
What does the red emergency line do?
Choose one answer below.
A
Disconnect the electrical cord
✓
B
Supplies trailer tanks and emergency-brake control
✓
C
Rely on ABS to fix the issue
✓
D
Drive faster to straighten the trailer
✓
QUESTION 21 / 25
Why are crossed air lines dangerous?
Choose one answer below.
A
They can leave trailer brakes inoperative
✓
B
Drive faster to straighten the trailer
✓
C
Disconnect the electrical cord
✓
D
Assume the fifth wheel is locked
✓
QUESTION 22 / 25
Why use dummy couplers?
Choose one answer below.
A
Disconnect the electrical cord
✓
B
Assume the fifth wheel is locked
✓
C
Use the parking brake while moving
✓
D
To keep dirt and water out of air lines
✓
QUESTION 23 / 25
Which shut-off valves should be closed when no trailer follows?
Choose one answer below.
A
Use the parking brake while moving
✓
B
Use only the trailer hand valve
✓
C
The rear valves on the last trailer
✓
D
Assume the fifth wheel is locked
✓
QUESTION 24 / 25
Why drain trailer air tanks?
Choose one answer below.
A
Ignore it if the tractor feels normal
✓
B
To remove water and oil
✓
C
Use the parking brake while moving
✓
D
Use only the trailer hand valve
✓
QUESTION 25 / 25
Which trailers and dollies are required to have ABS under the manual rule?
Choose one answer below.
A
Those built on or after March 1, 1998
✓
B
Use only the trailer hand valve
✓
C
Ignore it if the tractor feels normal
✓
D
Raise the landing gear halfway
✓
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