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Will help you turn safely.
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Will stop your trailer safely.
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Can cause a skid.
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Is impossible.
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Texas CDL Permit Test - Combination
(From the 2021 Texas CDL driver handbook)
| Number of questions: | 20 |
| Passing score: | 16 |
Directions:
All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Texas Commercial Motor Vehicle Drivers Handbook. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 20 multiple-choice questions, and applicants will need to correctly answer a minimum of 16 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
Passing grade —
4 or fewer errors
advertising
1.
Using the trailer hand valve while driving:
2.
Which type of vehicle is most prone to the “crack-the-whip” effect?
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A five-axle tractor semi-trailer
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A three-axle tractor semi-trailer
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A bobtail tractor
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A triple trailer
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3.
An air supply control in its "emergency" position will:
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Turn on the air supply.
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Apply the trailer emergency brakes.
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Prevent a skid.
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Accelerate the vehicle.
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4.
The easiest way to recognize that your trailer has begun to skid is to:
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Ask another driver.
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Use your mirrors to determine if the trailer has left the lane.
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Release the brake pedal and then push it down again.
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Watch the jackknife warning light on the control panel.
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5.
When coupling a trailer:
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Make sure to couple matching glad hands.
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Any glad hand can be connected to any other glad hand.
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It is best to leave one glad hand unattached.
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Only one set of glad hands should be connected.
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6.
The trailer hand valve:
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Should always be used for parking.
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Should only be used for parking on a downhill.
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Should never be used for parking.
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Should only be used when transporting cargo.
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7.
Driving a combination vehicle ____ than driving a single vehicle.
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Is easier
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Requires more driving skill
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Is better for training
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Is safer in inclement weather
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