Free Alaska CDL School Bus Endorsement Test Practice Test

Sample CDL School Bus 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 1Pre-Trip Inspection: Exterior

   When inspecting the exterior of a Type C school bus, you discover a cracked windshield. The crack is approximately 8 inches long and originates from the passenger side, extending towards the center. What is the immediate course of action according to most CDL school bus endorsement regulations?

   • A.Immediately report the crack to the fleet manager and recommend the bus be taken out of service until the windshield is replaced.(Correct)
   • B.Attempt to repair the crack with a temporary sealant to ensure continued operation.
   • C.Allow the bus to operate but instruct the driver to avoid using defroster settings that could exacerbate the crack.
   • D.Continue the inspection, noting the crack for future repair during scheduled maintenance.

   Explanation

   A cracked windshield, especially one of significant length (8 inches), can impair the driver's vision and compromise structural integrity. Regulations typically require such defects to be reported and the vehicle removed from service until repaired.

2. Question 2Pre-Trip Inspection: Stop Arm

   During a pre-trip inspection, you notice that the stop arm on the school bus is extending slowly and retracts with a grinding noise. You also observe a slight hydraulic fluid leak around the actuator. What is the most critical safety concern with this malfunction?

   • A.The slow extension, which might cause traffic to back up and create a secondary accident.
   • B.The hydraulic fluid leak, which poses a fire hazard if it contacts hot engine components.
   • C.The potential for the stop arm to fail to deploy, which could lead to a student being hit while crossing the street.(Correct)
   • D.The grinding noise, which could indicate a failing bearing that will eventually seize.

   Explanation

   The primary function of the stop arm is to signal other traffic to stop for students. A malfunctioning stop arm that fails to deploy or deploys incompletely poses a severe risk of students being struck by passing vehicles.

3. Question 3Air Brake System: Leak Detection

   A school bus equipped with air brakes is parked on a slight incline. After shutting down the engine, you notice the air brake system pressure dropping steadily over a 5-minute period. This indicates a potential issue. What is the most likely cause and its immediate implication?

   • A.A leak in the air dryer, causing excessive moisture in the system.
   • B.A worn air compressor, leading to slow pressure build-up during operation.
   • C.A leak in the service brake lines, meaning the brakes may not hold effectively, especially on grades.(Correct)
   • D.A faulty air governor, which would prevent the compressor from building sufficient pressure.

   Explanation

   A steady drop in air pressure when the engine is off indicates a leak somewhere in the air brake system. A leak in the service brake lines is critical as it directly impacts the ability of the brakes to function, potentially leading to brake failure.

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