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North Dakota CDL Combination Test 1
Practice mode
Question
1
of 19
QUESTION 1 / 19
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.
✓
B
Closing the rear shut-off valves and listening for escaping air.
✓
C
Disconnecting air supply lines and listening for escaping air.
✓
D
Rolling each trailer down a hill and testing the brakes.
✓
QUESTION 2 / 19
To prevent a rollover, a driver should:
Choose one answer below.
A
Keep cargo low.
✓
B
Place cargo high.
✓
C
Keep cargo loose.
✓
D
Turn quickly.
✓
QUESTION 3 / 19
What is the Johnson bar?
Choose one answer below.
A
A hand valve that works the trailer brakes
✓
B
A valve that indicates the fuel level
✓
C
A valve that measures the amount of liquid in the air brake system
✓
D
A valve that allows for the release of excess pressure in the braking system
✓
QUESTION 4 / 19
When driving a trailer with ABS, you should:
Choose one answer below.
A
Not depress the brakes as much as you would when driving a vehicle without ABS.
✓
B
Use extra braking force to ensure the ABS kicks in.
✓
C
Brake as you would when driving a vehicle without ABS.
✓
D
Try to not brakes as often as you would when driving a vehicle without ABS.
✓
QUESTION 5 / 19
Large combination vehicles take the longest amount of time to stop:
Choose one answer below.
A
When fully loaded.
✓
B
When partially loaded.
✓
C
When empty.
✓
D
When mostly loaded.
✓
QUESTION 6 / 19
The trailer hand valve should be used:
Choose one answer below.
A
Regularly to activate the trailer brakes in all driving conditions.
✓
B
Only to test the trailer brakes.
✓
C
Only in inclement weather when the trailer may skid.
✓
D
Only if the trailer is carrying a load.
✓
QUESTION 7 / 19
Pull out the trailer air supply control to test:
Choose one answer below.
A
The parking brake.
✓
B
The trailer emergency brakes.
✓
C
The trailer service brakes.
✓
D
The landing gear.
✓
QUESTION 8 / 19
If a trailer begins to skid, the driver should:
Choose one answer below.
A
Lock the brakes.
✓
B
Release the brakes.
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C
Steer in the opposite direction.
✓
D
Accelerate.
✓
QUESTION 9 / 19
When entering or crossing traffic while driving a combination vehicle, it is especially important that you:
Choose one answer below.
A
Sound your horn.
✓
B
Make sure there is a large enough gap for your vehicle.
✓
C
Expect other drivers to make room for your vehicle.
✓
D
Let other drivers wave you into their lane.
✓
QUESTION 10 / 19
If a trailer is too high:
Choose one answer below.
A
It will not make a difference when coupling.
✓
B
It may not couple correctly.
✓
C
Coupling will be more secure.
✓
D
Coupling will be easier.
✓
QUESTION 11 / 19
____ are the cause of more than half of all accident-related truck driver deaths.
Choose one answer below.
A
Truck rollovers
✓
B
Motorcycles
✓
C
Slippery roads
✓
D
Pedestrians
✓
QUESTION 12 / 19
If colors are being used to distinguish glad hands, which color is used for service lines?
Choose one answer below.
A
Orange
✓
B
Yellow
✓
C
Green
✓
D
Blue
✓
QUESTION 13 / 19
Look for matching colors when coupling glad hands. Service lines are often:
Choose one answer below.
A
Green.
✓
B
Orange.
✓
C
Red.
✓
D
Blue.
✓
QUESTION 14 / 19
When a combination vehicle goes around a corner:
Choose one answer below.
A
The turn should be made as tightly as possible.
✓
B
The front and rear wheels move in different paths.
✓
C
The rear wheels should run over the curb.
✓
D
It is acceptable for street signs to be knocked over if they are too close to the road.
✓
QUESTION 15 / 19
Trailers manufactured after ____ must be equipped with Anti-Lock Braking Systems (ABS).
Choose one answer below.
A
1943
✓
B
1998
✓
C
2009
✓
D
2015
✓
QUESTION 16 / 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.
✓
B
You are experiencing a trailer jackknife.
✓
C
Wheels have regained traction after a skid.
✓
D
Air pressure is above 45 psi.
✓
QUESTION 17 / 19
Proper coupling technique:
Choose one answer below.
A
Is the same on all vehicles.
✓
B
Is essential to the safe operation of a vehicle.
✓
C
Includes ensuring that the fifth wheel plate is not greased.
✓
D
Can be learned over time.
✓
QUESTION 18 / 19
The easiest way to recognize that your trailer has begun to skid is to:
Choose one answer below.
A
Ask another driver.
✓
B
Use your mirrors to determine if the trailer has left the lane.
✓
C
Release the brake pedal and then push it down again.
✓
D
Watch the jackknife warning light on the control panel.
✓
QUESTION 19 / 19
Having ABS on only one axle:
Choose one answer below.
A
Does not change braking in any way.
✓
B
Is not possible.
✓
C
Will allow the driver additional control over their vehicle when braking.
✓
D
Will cause extra strain on the other axles.
✓
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