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The tanker endorsement applies to drivers who wish to drive a tank in Class A, B, or C CDL. To add this endorsement to your CLP/CDL, you must pass a knowledge test on the problems posed by large volume liquid cargos. The Oklahoma CDL tank vehicles test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The OK tanker test covers the following sections of the Oklahoma CDL Manual: Driving Safely, Combination Vehicles, Tank Vehicles, Hazardous Materials. Take this OK tanker practice test now to prepare for the actual test!
1. If your truck has automatic transmission, you should downshift:
after entering a curve.
whenever road conditions allow.
when going down grades.
2. When checking the engine compartment in a vehicle inspection, you should check all of the following except:
Spring hangers
Coolant level in radiator
Engine oil level
3. Smooth bore tanks:
have bulkheads in them with holes to limit the flow of liquid.
have bulkheads with holes to let the liquid flow through.
have nothing inside to slow down the flow of liquid.
4. If you are being tailgated, you should:
open up room in front of you.
make quick changes.
increase your speed very gradually.
5. When you see you will need to slow down, you can warn drivers behind you by:
turning on the right turn signal.
tapping the brakes a few times.
slamming on the brakes.
6. Hydroplaning:
can occur at speeds as low as 30 mph.
only happens when tire pressure is higher than normal.
only occurs at extremely high speeds.
7. While you are driving a tanker, the front wheels begin to skid. Which of these is most likely to occur?
The truck will roll over.
You will keep moving forward no matter how you steer.
Excessive heat will cause chemical changes in the brake lining, which reduce friction.
8. When backing, you should:
back quickly.
use a helper if possible.
avoid using the mirrors.
9. Which of the following is a clue suggesting a shipment of HazMat?
The type of business is the shipper is in.
Tanks with diamond labels or placards on the premises.
All of the above.
10. The manifest for transporting hazardous wastes must be:
attached to the appropriate placard.
signed by hand.
appear on both sides and ends of the vehicle.
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OK CDL Tanker Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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