Free Florida CDL Tanker Endorsement Test Practice Test

Sample CDL Tanker Endorsement practice questions

Try a few representative questions below. Each includes the correct answer and a short explanation — the same style you'll see in the full practice test.

1. Question 1Liquid Surge and Momentum

   A tanker truck carrying 6,000 gallons of liquid is involved in a sudden braking event. The liquid has a specific gravity of 0.9. What is the approximate force exerted by the liquid's momentum on the front of the tank if the truck decelerates from 55 mph to 0 mph in 5 seconds?

   • A.Approximately 30,000 lbs
   • B.Approximately 110,000 lbs(Correct)
   • C.Approximately 220,000 lbs
   • D.Approximately 55,000 lbs

   Explanation

   First, calculate the weight of the liquid: 6,000 gallons * 8.34 lbs/gallon (water density) * 0.9 (specific gravity) = 44,952 lbs. Then, calculate deceleration: a = (Vf - Vi) / t = (0 mph - 55 mph) / 5 s = -11 mph/s. Convert mph/s to ft/s²: -11 mph/s * (5280 ft/mile) / (3600 s/hr) ≈ -16.13 ft/s². Force (F) = mass (m) * acceleration (a). Mass = Weight / g = 44,952 lbs / 32.2 ft/s² ≈ 1396 slugs. F = 1396 slugs * 16.13 ft/s² ≈ 22,511 lbs. This is the force of acceleration. The force exerted by the liquid's momentum during braking is related to this acceleration and the liquid's mass. A common rule of thumb for liquid surge force is approximately 2.5 times the static weight of the liquid for hard braking. So, 44,952 lbs * 2.5 ≈ 112,380 lbs. This is closest to 110,000 lbs.

2. Question 2Cargo Weight Calculation

   You are driving a tanker truck with a Gross Vehicle Weight Rating (GVWR) of 80,000 lbs, loaded with 5,000 gallons of gasoline (specific gravity 0.71). What is the approximate weight of the cargo?

   • A.Approximately 50,000 lbs
   • B.Approximately 40,000 lbs
   • C.Approximately 29,612 lbs(Correct)
   • D.Approximately 35,500 lbs

   Explanation

   Calculate the weight of the cargo: 5,000 gallons * 8.34 lbs/gallon (weight of a gallon of water) * 0.71 (specific gravity of gasoline) = 29,607 lbs. This is approximately 29,612 lbs.

3. Question 3Braking Systems for Tankers

   When inspecting a tanker truck designed to carry hazardous materials, what is the primary concern regarding the vehicle's braking system?

   • A.Verifying the presence of an auxiliary braking system, such as an engine retarder, for use during prolonged descents.
   • B.Checking the brake fluid level and condition, as it is critical for hydraulic brake systems.
   • C.Confirming that the parking brake can hold the vehicle stationary on a 20% grade with a full load.
   • D.Ensuring the air brake system is properly adjusted and functioning, with adequate stopping power to manage the vehicle's loaded weight and potential surge.(Correct)

   Explanation

   For hazardous materials tankers, the air brake system's integrity is paramount due to the significant weight and the dynamic forces of the liquid cargo. Proper adjustment and functionality are essential to safely control the vehicle under all conditions, especially considering the surge effect. While other options are important for general vehicle safety, they are secondary to the air brake system's primary role in managing a heavy, shifting load.

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