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Will not make a difference in braking.
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Will provide increased control in braking.
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Will likely cause the air brakes to malfunction.
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Iowa CDL Permit Test - Double
(From the 2021 Iowa CDL driver handbook)
| Number of questions: | 20 |
| Passing score: | 16 |
Directions:
This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Each question has three possible answer choices. Test questions come from the Iowa Commercial Driver License Manual. Questions come from chapters covering: Driving Safely, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.
Passing grade —
4 or fewer errors
advertising
1.
Having anti-lock brakes on only one axle:
2.
Texting while driving is especially dangerous because:
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It is both a mental and physical distraction.
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A message may be upsetting to the driver.
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People like to read and may become too engaged in their phones.
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3.
Rust around wheel nuts may mean:
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It has rained recently.
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The nuts could be loose.
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The tires should be replaced.
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4.
Rims with welding repairs:
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Are not safe to be used.
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Are acceptable to be used on tires on the rear of a vehicle.
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Are acceptable to be used only when carrying a heavy load.
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5.
If you realize you may be running late to your destination, you should:
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Speed up.
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Get upset.
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Deal with it and drive at a safe speed.
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6.
If you cannot reverse your trailer in a straight path, you should:
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Swerve back and forth while backing.
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Back toward the driver's side.
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Back toward the passenger's side.
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7.
After a tire has been changed, the driver should stop after a short distance to:
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Check the tightness of the lug nuts.
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Ensure that the tire has remained clean.
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Inflate the new tire.
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