Free New Hampshire 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 1Air Brake Systems

   A school bus equipped with a Type C (conventional) chassis and a GVWR of 26,000 lbs is involved in a minor collision where the rear bumper is slightly deformed. The bus is still drivable, but the driver notices a significant drop in braking performance. What is the MOST likely cause of this issue, considering the bus's system and the nature of the damage?

   • A.A ruptured air brake hose in the rear axle assembly, potentially exacerbated by the bumper impact.(Correct)
   • B.A malfunction in the anti-lock braking system (ABS) module, triggered by the impact.
   • C.A failure in the hydraulic brake fluid reservoir, leading to a complete loss of braking pressure.
   • D.Overheating of the transmission fluid due to the stress of the collision, causing brake fade.

   Explanation

   A ruptured air brake hose, particularly one located near the rear axle or bumper area, would directly lead to a rapid loss of air pressure, compromising braking effectiveness. While other issues can cause braking problems, the specific scenario of a rear bumper deformation and subsequent braking performance drop strongly implicates the air brake system.

2. Question 2Engine and Exhaust Systems

   During a pre-trip inspection of a school bus with a diesel engine, you discover that the exhaust gas temperature (EGT) gauge is reading unusually high, even at idle. This indicates a potential issue that could lead to engine damage and reduced performance. Which of the following conditions is MOST likely responsible for this elevated EGT?

   • A.An improperly functioning turbocharger, leading to over-boosting.
   • B.Low engine oil pressure due to a faulty oil pump.
   • C.A significant leak in the intake manifold gasket, causing unmetered air to enter the combustion chamber.
   • D.A clogged diesel particulate filter (DPF) or a malfunctioning exhaust backpressure sensor.(Correct)

   Explanation

   A clogged DPF or a faulty exhaust backpressure sensor will restrict exhaust flow, causing exhaust gases to build up pressure and heat within the exhaust manifold and cylinders. This elevated backpressure directly translates to higher EGTs. Over-boosting (turbocharger issue) would typically lead to higher power and potentially higher EGTs, but a restriction is a more direct cause of consistently high EGTs at idle. Intake leaks and low oil pressure have different primary symptoms.

3. Question 3Weight and Capacity

   You are operating a school bus with a Gross Vehicle Weight Rating (GVWR) of 30,000 lbs and a Gross Combination Weight Rating (GCWR) of 45,000 lbs. The bus is currently empty. You are dispatched to pick up a group of 50 elementary school students, each weighing an average of 70 lbs. If the bus itself weighs 20,000 lbs, what is the total weight of the loaded bus and what is its status relative to the GCWR?

   • A.23,500 lbs; exceeding GCWR limits.
   • B.33,500 lbs; within GCWR limits.(Correct)
   • C.23,500 lbs; within GCWR limits.
   • D.33,500 lbs; exceeding GCWR limits.

   Explanation

   The total weight of the students is 50 students * 70 lbs/student = 3,500 lbs. The total weight of the loaded bus is the bus weight plus the student weight: 20,000 lbs + 3,500 lbs = 23,500 lbs. This is the Gross Vehicle Weight (GVW). The GCWR is the maximum combined weight of the towing vehicle and the trailer. Since the bus is not towing anything, the relevant limit is the GVWR of 30,000 lbs. The loaded bus weight (23,500 lbs) is below the GVWR. The question mentions GCWR, which is irrelevant in this scenario as there's no trailer. However, if we interpret the question as asking about the *potential* for exceeding GCWR under *other* circumstances (which it doesn't explicitly state), then the calculation is for the current load. The loaded bus weight is 23,500 lbs, which is well within the GVWR of 30,000 lbs and the GCWR of 45,000 lbs.

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