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Oklahoma CDL Permit Test - Double

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 Oklahoma 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.
During a trip, landing gear should be:
Completely raised.
Completely lowered.
Skimming the pavement.
2.
Anti-Lock Braking Systems (ABS):
Are not used on trucks.
Are only used on tucks carrying hazardous materials.
Allow drivers to stay in control when braking.
3.
Doubles combinations:
Are less likely to jackknife than singles.
Are less likely to roll over than singles.
Require a larger reaction time than singles.
4.
Using a helper when backing up a large vehicle is:
Encouraged.
Discouraged.
Illegal.
5.
If using spring brakes when hauling a heavy load, a complete stop will:
Be impossible.
Take a long time.
Take a short amount of time.
6.
What can happen if the exhaust system is not working properly?
Poisonous fumes may enter the cab.
Fumes may exit the rear of the muffler system.
Proper steering may be impossible.
7.
If you doubt that you have enough space to safely drive under a bridge or sign, you should:
Drive faster.
Drive more slowly.
Drive on the shoulder.
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