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Driving Test
Missouri
Missouri CDL Combination 1
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Q.1
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Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
The trailer will stop normally.
The trailer will not have brakes.
The trailer will speed up.
Q.2
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When braking while pulling a trailer equipped with anti-lock brakes, you should:
Pump the brakes.
Use extra braking force to ensure the brakes kick in.
Brake as you would without anti-lock brakes.
Q.3
Submit
The service air line is often controlled by the foot brake and is attached to the ____ valves.
Relay
Supply
Emergency
Q.4
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In an empty combination vehicle, the stiff suspension springs and strong brakes will have:
High traction.
Low traction.
No traction.
Q.5
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When coupling, after you've connected the air lines to the trailer, you should:
Supply air to the trailer.
Activate the emergency brake.
Disconnect the glad hands.
Q.6
Submit
Fully-loaded rigs:
Usually are very responsive to steering.
Are more likely to roll over than empty rigs.
Can stop quickly.
Q.7
Submit
Operating combination vehicles usually requires ____ operating single vehicles.
Less skill than
About the same level of skill as
More skill than
Q.8
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What is a bobtail tractor?
A tractor without a trailer
A tractor attached to two trailers
A tractor with a tank
Q.9
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A driver should test the tractor protection valve by:
Pulling the yellow, diamond-shaped knob.
Releasing air with the brake pedal.
Unlocking the trailer doors.
Q.10
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If a parked trailer does not have spring brakes, you should keep the trailer from moving by:
Having the vehicle parked against a wall or other vehicle.
Using chock blocks.
Parking on a slight incline.
Q.11
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When backing up your tractor while coupling it to a trailer, the trailer brakes should be:
Deactivated.
Locked.
Unlocked.
Q.12
Submit
When a vehicle goes around a corner, the rear wheels:
Follow the same path as the front wheels.
Follow a different path than the front wheels.
Should not be a concern to the driver.
Q.13
Submit
In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:
20 and 45 psi.
75 and 105 psi.
50 and 65 psi.
Q.14
Submit
If you cannot reverse your trailer in a straight path, you should:
Swerve back and forth while backing.
Back toward the driver's side.
Back toward the passenger's side.
Q.15
Submit
To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:
Pump the air brakes to activate the ABS.
Look into the back of the fifth wheel.
Check for wheel speed sensors coming from the back of the brakes.
Q.16
Submit
All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).
1943
1998
2009
Q.17
Submit
When you are pulling a trailer, the air supply control lever should be in its ____ position.
Emergency
Supply
Normal
Q.18
Submit
When driving while pulling trailers, you should:
Make sudden turns with the steering wheel.
Avoid making sudden moves.
Push the accelerator to the floor when starting from a stop.
Q.19
Submit
Place the trailer air supply control in its "emergency" position to test:
The trailer emergency brakes.
A coupling device.
The anti-lock brakes.
Q.20
Submit
If you press the tractor air supply control and your trailer's spring brakes do not release, you should:
Inspect the air line connections.
Activate the Anti-Lock Braking System.
Turn the engine off and on again.
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