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New Jersey CDL Combination Test 2
Practice mode
Question
1
of 19
QUESTION 1 / 19
What is another name for the service line?
Choose one answer below.
A
The signal line
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B
The cable line
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C
The surplus line
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D
The power line
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QUESTION 2 / 19
When driving a tractor-trailer equipped with ABS, you should:
Choose one answer below.
A
Stop harder than you would otherwise.
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B
Use extra braking force to ensure the ABS kicks in.
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C
Brake as you normally would.
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D
Brake using less pressure than you would otherwise use.
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QUESTION 3 / 19
While inspecting a coupling, you should go under the trailer and:
Choose one answer below.
A
Detach the jaws from around the kingpin.
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B
Make sure the locking lever is in the "emergency" position.
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C
Remove the safety latch.
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D
Look into the back of the fifth wheel.
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QUESTION 4 / 19
Rollovers happen when:
Choose one answer below.
A
A truck driver is driving too fast.
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B
The driver of a vehicle in front of a truck is moving to slowly.
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C
A truck driver is driving too slowly.
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D
ABS is working effectively.
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QUESTION 5 / 19
Using the trailer hand brake while experiencing a trailer jackknife will:
Choose one answer below.
A
Stop the skid.
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B
Straighten the trailer.
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C
Increase traction.
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D
Continue the skid.
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QUESTION 6 / 19
Emergency air lines are often coded with the color:
Choose one answer below.
A
Green.
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B
Orange.
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C
Yellow.
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D
Red.
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QUESTION 7 / 19
If oil and water build up in your vehicle's air tanks, the brakes:
Choose one answer below.
A
May not work correctly.
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B
May feel squishy.
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C
Will squeal loudly when used.
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D
Will be extremely sensitive.
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QUESTION 8 / 19
What does the tractor protection valve do?
Choose one answer below.
A
Protects the tractor from being stolen
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B
Protects the tractor from exceeding a set speed
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C
Keeps air in the braking system, should the trailer break away or develop a leak
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D
Ensures oil adequately lubricates the engine
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QUESTION 9 / 19
If the trailer begins to skid, it is best to:
Choose one answer below.
A
Release the brakes.
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B
Accelerate.
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C
Quickly turn the steering wheel one way, then the other.
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D
Brake.
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QUESTION 10 / 19
To prevent a trailer from rolling over, you should:
Choose one answer below.
A
Speed up when nearing a corner.
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B
Make sudden steering moves.
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C
Take on-ramps faster than the posted speed limit.
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D
Drive slowly around corners.
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QUESTION 11 / 19
If a trailer begins to jackknife, you should not:
Choose one answer below.
A
Release the brakes.
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B
Apply the trailer hand brake.
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C
Allow the wheels to grip the road.
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D
Allow the trailer to straighten out.
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QUESTION 12 / 19
If unsure if a trailer is equipped with ABS, you can:
Choose one answer below.
A
Check under the trailer for wheel speed sensors coming from the back of the brakes.
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B
Try driving on a slippery surface and see if ABS kicks in.
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C
Assume it does have ABS.
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D
Remove a tire and look for the ABS sensor on the axle.
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QUESTION 13 / 19
In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:
Choose one answer below.
A
Air pressure drops to a level between 20 and 45 psi.
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B
You are experiencing a trailer jackknife.
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C
Wheels have regained traction after a skid.
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D
Air pressure is above 45 psi.
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QUESTION 14 / 19
If colors are being used to distinguish glad hands, which color is used for emergency lines?
Choose one answer below.
A
Orange
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B
Yellow
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C
Blue
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D
Red
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QUESTION 15 / 19
Driving a combination vehicle ____ than driving a single vehicle.
Choose one answer below.
A
Is easier
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B
Requires more driving skill
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C
Is better for training
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D
Is safer in inclement weather
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QUESTION 16 / 19
Proper coupling technique:
Choose one answer below.
A
Is the same on all vehicles.
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B
Is essential to the safe operation of a vehicle.
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C
Includes ensuring that the fifth wheel plate is not greased.
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D
Can be learned over time.
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QUESTION 17 / 19
What is a bobtail?
Choose one answer below.
A
A tractor without a semi-trailer
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B
A tractor with two semi-trailers
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C
A tractor that goes faster than the speed limit
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D
A tractor that goes slower than the speed limit
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QUESTION 18 / 19
Pull out the trailer air supply control to test:
Choose one answer below.
A
The parking brake.
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B
The trailer emergency brakes.
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C
The trailer service brakes.
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D
The landing gear.
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QUESTION 19 / 19
The best way to recognize that your trailer has begun to skid is by:
Choose one answer below.
A
Seeing other drivers' faces.
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B
Seeing it in your mirrors.
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C
Feeling it.
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D
Listening to the radio.
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