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Leave the rear shut-off valves open.
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Remove the service line valve.
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Close the emergency line valve.
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Leave the emergency line valve open.
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Indiana CDL Permit Test - Combination
(From the 2021 Indiana 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 Commercial Driver License Manual. 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.
After finishing a pre-trip inspection, you should:
2.
Emergency air lines are often coded with the color:
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Green.
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Orange.
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Yellow.
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Red.
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3.
The trailer hand valve should be used:
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Regularly to activate the trailer brakes in all driving conditions.
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Only to test the trailer brakes.
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Only in inclement weather when the trailer may skid.
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Only if the trailer is carrying a load.
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4.
When driving a bobtail tractor, you should be aware that:
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Bobtails stop very easily.
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Bobtails cannot drive as fast as tractors with semitrailers.
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Bobtails are more difficult to stop than tractors with semitrailers.
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Bobtails are illegal in most states.
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5.
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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6.
In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:
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Air pressure drops to a level between 20 and 45 psi.
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You are experiencing a trailer jackknife.
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Wheels have regained traction after a skid.
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Air pressure is above 45 psi.
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7.
Rollovers happen when drivers:
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Turn too quickly.
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Do not driving fast enough.
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Pay attention to the road.
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Drive illegally.
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