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FREE CDL PRACTICE TESTS

FREE CDL AIR BRAKE TEST

FREE CDL PASSENGER TEST

FREE CDL GENERAL KNOWLEDGE TEST

FREE CDL PRE TRIP INSPECTION TEST

FREE CDL TANKER TEST

FREE CDL COMBINATION TEST

FREE CDL DOUBLES AND TRIPLES TEST

FREE CDL HAZ MAT TEST

CDL SAMPLE AIR BRAKES PRACTICE TEST


1. The service air line is controlled by:

The pressure applied to the line by the foot brake or the trailer hand brake.

The relay valve which connects the trailer air tanks to the trailer air brakes

The relay valve which sends air pressure from the trailer air tank to the trailer brake chambers

All of the above

2. For the coupling to be complete for a fifth wheel with a locking lever, where must the safety catch for the fifth wheel locking lever be?

Under the locking lever

Level with the locking lever.

Level with the locking lever.

None of the above.

3. When coupling to the trailer, the fifth wheel must:          

be properly lubricated

have unlocking handle in automatic lock position

be tilted down towards rear of tractor

all of the above

4. What is off tracking?

When a vehicle goes around a corner, and the driver pulls off the road.

When a vehicle goes around a curve and turns back the other way.

When a vehicle goes around a corner, the rear wheels follow the same path as the front wheels.

When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels.

5. Relay valves:

Allow the trailer brakes to be applied more quickly

Signal the low air warning device

Reduce air pressure to the drive axle

Are not required on combination

6. The shut-off valves must be in what positions when pulling doubles?

lead trailer closed; rear trailer open; dolly air tank closed

lead trailer closed; rear trailer closed; dolly air tank open

lead trailer open; rear trailer closed; dolly air tank open

lead trailer open; rear trailer closed; dolly air tank closed

7. Which one of the following is controlled by the foot brake?"

The emergency air line

The shut off valve

The service air line

The hose coupler

8. Which one of the following statements about tractor protection valves is NOT true?

It keeps air in the tractor in the event the trailer air leaks

It is controlled by the trailer air supply valve in the cab

It will close automatically if air pressure is low

When it closes it allows air to leak from the tractor line

9. A device which connects the service and emergency air lines from the truck to the trailer is called:

Relay switch

Service couplers

Glad hands

Shut off valves

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PRE-TRIP INSPECTION
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PASENGER TEST
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HAZ MAT
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GENERAL KNOWLAGE
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COMBINATION
CLICK HERE
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TANKER
CLICK HERE
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DOUBLES AND TRIPLES
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