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DMV PRACTICE
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New Jersey CDL Combination Test 1
Practice mode
Question
1
of 20
QUESTION 1 / 20
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 2 / 20
What does the trailer air supply control look like?
Choose one answer below.
A
It is a square blue knob.
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B
It is a triangular yellow knob.
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C
It is an eight-sided red knob.
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D
It is a circular orange knob.
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QUESTION 3 / 20
When uncoupling a trailer, landing gear should be:
Choose one answer below.
A
Raised completely.
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B
Lowered halfway.
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C
Just off the pavement.
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D
Firmly on the ground.
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QUESTION 4 / 20
Glad hands are:
Choose one answer below.
A
Coupling devices.
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B
Happy passengers.
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C
Eager mechanics.
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D
Pleased drivers.
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QUESTION 5 / 20
Push in the trailer air supply control to:
Choose one answer below.
A
Activate the emergency brakes.
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B
Deactivate the air brakes.
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C
Sound the horn.
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D
Supply the trailer with air.
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QUESTION 6 / 20
To lower the risk of a rollover, you should:
Choose one answer below.
A
Load the cargo as far forward as possible.
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B
Load the cargo as far back as possible.
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C
Load the cargo as low as possible.
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D
Stack the cargo as high as possible.
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QUESTION 7 / 20
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 8 / 20
An Anti-Lock Braking System (ABS):
Choose one answer below.
A
Allows wheels to lock up.
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B
Prevents wheels from locking up.
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C
Makes it easier to turn a large vehicle.
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D
Assists with the operation of brake lights.
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QUESTION 9 / 20
What is a tractor protection valve?
Choose one answer below.
A
A valve to keep air in the brake system should there be a bad leak
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B
A valve that prevents the truck from being stolen
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C
A valve that prevents the driver from going too fast
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D
A valve that prevents the trailer from accidentally being released
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QUESTION 10 / 20
The trailer hand valve:
Choose one answer below.
A
Should always be used for parking.
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B
Should only be used for parking on a downhill.
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C
Should never be used for parking.
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D
Should only be used when transporting cargo.
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QUESTION 11 / 20
What happens when the wheels of a trailer lock up?
Choose one answer below.
A
The trailer will often continue to move in a straight line.
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B
The trailer may disengage.
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C
The trailer may swing around.
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D
Steering will become easier.
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QUESTION 12 / 20
Operating a combination vehicle usually requires ____ operating a single vehicle.
Choose one answer below.
A
Less skill than
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B
About the same level of skill as
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C
More skill than
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D
Exactly the same level of skill as
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QUESTION 13 / 20
Before a drive, ensure that air flows to all trailers by:
Choose one answer below.
A
Opening the rear shut-off valves and listening for escaping air.
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B
Closing the rear shut-off valves and listening for escaping air.
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C
Disconnecting air supply lines and listening for escaping air.
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D
Rolling each trailer down a hill and testing the brakes.
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QUESTION 14 / 20
Rollovers happen when drivers:
Choose one answer below.
A
Turn too quickly.
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B
Do not driving fast enough.
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C
Pay attention to the road.
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D
Drive illegally.
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QUESTION 15 / 20
The trailer hand valve should be used:
Choose one answer below.
A
Regularly to activate the trailer brakes in all driving conditions.
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B
Only to test the trailer brakes.
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C
Only in inclement weather when the trailer may skid.
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D
Only if the trailer is carrying a load.
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QUESTION 16 / 20
Avoid needing to make sudden lane changes by:
Choose one answer below.
A
Using your horn to encourage other drivers to move out of your lane.
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B
Only driving slower than the posted speed limit.
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C
Watching the road ahead while driving.
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D
Pulling off the road and waiting when there is high traffic.
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QUESTION 17 / 20
If you need to back your trailer but cannot back up in a straight path, you should:
Choose one answer below.
A
Back toward the passenger's side.
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B
Back toward the driver's side.
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C
Swerve back and forth while backing.
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D
Always turn to your right.
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QUESTION 18 / 20
If colors are being used to distinguish glad hands, which color is used for service lines?
Choose one answer below.
A
Orange
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B
Yellow
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C
Green
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D
Blue
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QUESTION 19 / 20
When coupling a trailer:
Choose one answer below.
A
Make sure to couple matching glad hands.
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B
Any glad hand can be connected to any other glad hand.
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C
It is best to leave one glad hand unattached.
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D
Only one set of glad hands should be connected.
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QUESTION 20 / 20
A tractor protection valve is:
Choose one answer below.
A
A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.
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B
A device that prevents theft.
✓
C
A device that controls fuel levels.
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D
A device that allows the battery to recharge efficiently.
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