CDL School Bus Endorsement S Practice Test 1

Question 1

The air pressure governor cut-out is typically within what psi range?

Accepted Answer

120-140 psi.

Answer

In an air brake system, the air compressor governor is responsible for maintaining air pressure within a safe operating range. The governor typically cuts out, stopping the compressor, when the air pressure reaches between 120-140 psi. This ensures the system has sufficient pressure for braking while preventing over-pressurization, which could damage components.

Question 2

As you check that the steering box is mounted securely and not leaking, you should look for any missing ________.

Accepted Answer

All of the listed answers.

Answer

When inspecting the steering box, it's vital to ensure it is securely mounted and not leaking, as this is critical for vehicle control. Drivers must specifically look for any missing nuts, bolts, or cotter keys, as these fasteners are essential for maintaining the integrity and secure attachment of the steering components. Missing any of these could lead to steering failure, posing a severe safety risk.

Question 3

The caps of your vehicle's fuel tank need to be ________.

Accepted Answer

Secured tightly.

Answer

Fuel tank caps must be secured tightly to prevent fuel spills, evaporation, and contamination. A loose cap can create a dangerous fire hazard, allow fuel to slosh out during maneuvers, and compromise the integrity of the fuel system. Ensuring a tight seal is crucial for both safety and environmental protection.

Question 4

It's important for a school bus driver to ensure the emergency exits are _________.

Accepted Answer

All of the listed answers.

Answer

For passenger safety, it is essential that all emergency exits on a school bus are fully functional. This means they must operate smoothly for quick evacuation, be undamaged to ensure reliability, and close securely to prevent accidental opening during transit. All these aspects are critical for a safe and effective emergency egress system, making 'All of the listed answers' the correct choice.

Question 5

Do not change gears while crossing the tracks, if ________.

Accepted Answer

Your bus has a manual transmission.

Answer

Changing gears on a manual transmission while crossing railroad tracks is extremely dangerous because it can cause the bus to stall directly on the tracks. If the bus stalls, it could be hit by an oncoming train, leading to catastrophic consequences. Therefore, drivers of manual transmission buses must select a gear that allows them to cross without shifting, ensuring continuous momentum.

CDL Practice Test

CDL Practice Test

CDL School Bus Endorsement S Practice Test 1