TheoryCDL Tanker Endorsement Practice Test Video
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Q1A driver notices the truck feels like it is being pushed forward when slowing down. What is the most likely cause of this sensation?
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✓ Correct answer: Front-to-back liquid surge is shifting weight toward the front of the vehicle
When decelerating, unbaffled or partially filled liquid surges forward, adding momentum to the front of the vehicle and making it harder to stop — a phenomenon the CDL manual calls front-to-back surge.
Q2Which tank design uses internal metal walls that completely divide the tank into separate sealed compartments, preventing all liquid movement between sections?
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✓ Correct answer: Bulkheaded tank
Bulkheads are solid dividers that completely separate a tank into independent compartments so liquid cannot flow between them, unlike baffles which have openings to allow limited flow.
Q3A smooth-bore tank is MOST commonly used to transport which type of cargo?
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✓ Correct answer: Food-grade liquids such as milk or juice
The CDL manual notes that smooth-bore tanks without internal baffles are typically used for food products because baffles are difficult to sanitize and can harbor bacteria.
Q4You are driving a baffled liquid tank that is half full. Compared to a smooth-bore tank at the same fill level, how do the baffles affect surge on curves?
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✓ Correct answer: Baffles reduce front-to-back surge but do little to control side-to-side surge on curves
The CDL manual states that baffles control front-to-back surge but do NOT fully control side-to-side surge; a driver must still manage speed on curves to prevent rollover.
Q5A tank truck is 80% full of a low-viscosity liquid. The driver begins a gradual braking maneuver on a level road. Which outcome best describes what happens to vehicle handling?
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✓ Correct answer: The moving liquid creates a forward surge force that adds to stopping distance
Even at high fill levels there is enough free space for liquid to surge; the forward momentum of the liquid pushes against the direction of braking and extends stopping distance, as the CDL manual warns.
Q6Which of the following fill levels typically produces the WORST liquid surge in an unbaffled tank?
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✓ Correct answer: Around 50% full
The CDL manual warns that a tank that is about half full produces the greatest surge because there is both maximum free space for movement and a large mass of liquid that can accelerate within the tank.
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