Utah CDL — Air Brakes Practice Test 8

1.On a newer air-brake vehicle, how do you set the parking brakes?

Pull the yellow, diamond-shaped knob outPush the yellow, diamond-shaped knob inRotate a round blue knob clockwiseHold the foot valve down firmly

2.What is the 'wig wag' found on some air-brake vehicles?

A gauge that shows applied brake pressureA lever used to release the spring brakesA valve that drains the tanks by itselfA mechanical arm that drops into view when pressure is low

3.On a long, steep downgrade, the service brakes should be treated as what?

The main thing slowing the vehicleA substitute for downshiftingSomething to avoid using at allA supplement to the engine's braking effect

4.What does a supply pressure gauge tell the driver?

How much air is stored in the tanksHow hard the pedal is being pressedThe temperature of the brake drumsWhether the ABS is functioning

5.If the low-air-pressure warning comes on while you are driving, what should you do?

Speed up to reach your destination soonerBring the vehicle to a safe stop and park itIgnore it until the spring brakes grabPump the pedal repeatedly to rebuild pressure

6.What job does an alcohol evaporator do on a vehicle with air brakes?

It strains oil out of the compressor crankcaseIt lowers the risk of ice building up inside brake valves when it is coldIt raises the boiling point of the brake fluidIt lets you skip tank draining all winter

7.On an older air-brake truck, what might the parking brake control look like?

A yellow knob shaped like a diamondA foot pedal placed left of the clutchA sliding switch mounted on the steering columnA round blue knob, or a lever that swings

8.What does 'brake lag' mean in an air-brake system?

The distance covered while you are distractedThe time the compressor needs to refill the tanksThe gap between the service and spring brakesThe delay before the brakes act after the pedal is pushed

9.How does an air-brake system turn on the brake lights for drivers behind you?

Through a cable pulled by the pedalThrough an electric switch triggered by air pressureThrough a sensor mounted on the slack adjusterThrough the wig wag arm

10.How do you carry out the service brake test at the end of the air-brake inspection?

Rev the engine in neutral and listen for escaping airCreep ahead at about five mph, brake firmly, and note any pull or delaySet the parking brake and press the pedal at the same timeDrain every tank and check what comes out