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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.
When traction is poor, a driver should accelerate especially slowly:
Because it is always good to accelerate slowly.
To keep from losing control of the vehicle.
To keep from accelerating faster than the vehicle ahead.
2.
Without the proper amount of oil in its engine:
A vehicle will have difficulty stopping.
A vehicle will make quick, jerking movements while being driven.
The engine may be quickly damaged.
3.
If you are being tailgated, you should:
Drive on the shoulder.
Allow the vehicle to pass.
Drive faster.
4.
Placards should be used:
Any time a vehicle is carrying hazardous materials.
When there is extra space on a truck.
Only when the amount of hazardous materials on a truck exceeds 200 pounds.
5.
If an unusual noise or feeling occurs in a vehicle while it is being driven, the driver should:
Assume it is not a concern and continue driving.
Hope the vehicle does alright until it is switched to another driver.
Check the situation to determine the proper solution.
6.
To make it easier to leave a parked position, you should park:
In a way that allows you to back up when exiting.
In a way that allows you to pull forward when exiting.
Only on the side of roadways, not in parking lots.
7.
The air compressor is connected to the:
Transmission.
Engine.
Radiator.
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