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Iowa CDL Permit Test - Combination

(From the 2020 Iowa 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.
You have made error so far
Passing grade —
4 or fewer errors
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1.
The best way to recognize that your trailer has started to skid is by:
Seeing other drivers' faces.
Checking the trailer in your mirrors.
Feeling the trailer move.
2.
A trailer that is too high:
May not couple correctly.
Will couple securely.
Is not an issue.
3.
During a trip, the ____ should be open.
Rear service line shut-off valve
Rear supply line shut-off valve
Inner shut-off valves
4.
When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.
The Anti-Lock Braking System
The emergency braking system
The trailer service brakes
5.
Combination vehicles:
Often have taller trailers than single commercial vehicles.
Are usually lighter than single commercial vehicles.
Require more skill to drive than single commercial vehicles.
6.
To help prevent a rollover, cargo should be:
Placed as high as possible inside a trailer.
Placed as low as possible inside a trailer.
Placed on the driver’s side of a trailer.
7.
The trailer hand valve:
Should always be used for parking.
Should only be used for parking on a downgrade.
Should never be used for parking.
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