|
Are not used on trucks.
|
|
|
Are only used on tucks carrying hazardous materials.
|
|
|
Allow drivers to stay in control when braking.
|
Oklahoma CDL Permit Test - Double
(From the 2021 Oklahoma 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 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.
Passing grade —
4 or fewer errors
advertising
1.
Anti-Lock Braking Systems (ABS):
2.
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.
|
3.
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.
|
4.
If using spring brakes when hauling a heavy load, a complete stop will:
|
Be impossible.
|
|
|
Take a long time.
|
|
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Take a short amount of time.
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5.
Using a helper when backing up a large vehicle is:
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Encouraged.
|
|
|
Discouraged.
|
|
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Illegal.
|
6.
Doubles combinations:
|
Are less likely to jackknife than singles.
|
|
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Are less likely to roll over than singles.
|
|
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Require a larger reaction time than singles.
|
7.
During a trip, landing gear should be:
|
Completely raised.
|
|
|
Completely lowered.
|
|
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Skimming the pavement.
|
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