Manitoba Airbrake Practice Exam

When testing the low air-pressure warning device, which condition must be met regarding the engine and ignition?

1. Engine running, ignition off

2. Engine stopped, ignition off

3. Engine can be stopped or running, ignition must be on

4. Engine must be running, ignition on

The correct answer is: Engine can be stopped or running, ignition must be on

The low air-pressure warning device is responsible for notifying the driver of low air-pressure in the vehicle's tires. This is a crucial safety feature as it helps prevent accidents and damage to the tires and vehicle. In order for the device to accurately test the air-pressure, the engine and ignition must be in a specific state. Option A is incorrect because the engine needs to be running in order to accurately test the air-pressure. With the engine off, the device will not be able to accurately detect the air-pressure in the tires. Option B is also incorrect for the same reason as option A - without the engine running, the device cannot accurately test the air-pressure. Option D is incorrect because the ignition needs to be off in order to test the air-pressure warning device. With the ignition on, the device may not work properly and could give inaccurate readings. Therefore, option C is the correct answer