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District Of Columbia CDL Permit Test - Tank

Number of questions: 20
Passing score: 16
Directions: This endorsement is required to haul any liquid or gaseous materials in a tank or tanks having a capacity of 1,000 gallons or more that is either permanently or temporarily attached to the vehicle or chassis. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. Each question has four possible answer choices. To pass, the applicant must answer at least 16 questions correctly. Test questions come from the Washington D.C. Commercial Driver License Manual. Questions come from chapters covering: Driving Safely, Tank Vehicles, Hazardous Materials and Combination Vehicles. The Tank endorsement can be used with the Class A, B or C CDL.
You have made error so far
Passing grade —
4 or fewer errors
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1.
Simply changing lanes can cause:
A “crack-the-whip” effect, resulting in a rollover.
A trailer to straighten out.
Confusion over which lane the driver is hoping to use.
Other drivers to reduce their speed.
2.
In a double or triple combination:
Cargo weight must be evenly distributed between all trailers.
The heaviest trailer should be positioned directly behind the cab.
The heaviest trailer should be positioned in the rear.
The weight of the trailers does not matter.
3.
To drive safely, it is important to remember:
How much distance your vehicle needs to stop.
Possible shortcuts along your planned route.
That arriving to your destination on time is the most important thing.
That other drivers will move out of your way when you are merging with traffic.
4.
Leaking shock absorbers:
Are normal.
Indicate a potentially dangerous defect.
Will prevent the turn signals from working.
Pose no threat if the vehicle is only driven on highways.
5.
When approaching a railroad crossing, a driver should:
Rely only on automated signals.
Expect to hear a train.
Cross the tracks before an approaching train reaches the crossing.
Reduce their speed.
6.
What is a concern immediately after it begins raining?
The water will mix with grease and oil on the road, making the roadway slippery.
A driver may forget where the windshield wiper lever is located.
It may stop raining.
People will be using their windshield wipers needlessly.
7.
What does the trailer air supply control look like?
It is a square blue knob.
It is a triangular yellow knob.
It is an eight-sided red knob.
It is a circular orange knob.
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