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Iowa CDL Permit Test - Double

(From the 2019 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.
You have made error so far
Passing grade —
4 or fewer errors
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1.
In cool weather, as the temperature begins to rise and ice begins to melt:
It is usually safe to drive.
The road will become even more slippery.
Traction will increase.
2.
If unable to tell if the road is becoming icy and slippery, a driver:
Should try guessing.
May open their window and feel the front of the side mirror for ice.
Should look at the road closely.
3.
Dual tires should:
Always come into contact with one another.
Come into contact with one another fairly regularly.
Not come into contact with one another.
4.
When starting an engine, warning lights and buzzers should:
Turn on and stay on.
Flicker occasionally.
Turn off right away.
5.
How does doubling your speed from 20 mph to 40 mph affect your vehicle's braking distance?
It stays about the same.
It doubles.
It quadruples.
6.
Shaded areas of a road:
Usually don’t freeze.
Are usually blocked from all moisture, so they cannot freeze.
Will remain slick after ice has melted on other areas of the road.
7.
When transporting cargo, drivers must check the securement of the cargo every:
10 miles.
150 miles.
500 miles.
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