Georgia CDL — Air Brakes Practice Test 6

11.You are making a normal stop in an air-braked vehicle with a manual transmission. When should you push the clutch in?

The moment your foot touches the brake pedalBefore you begin braking at allOnly after shifting into neutral at full speedOnce engine rpm has dropped close to idle

12.When leaving your air-braked vehicle unattended, what does proper (and required) practice call for?

Leaving the engine running so air pressure holds the brakes onLeaving the transmission in gear with the parking brake releasedPumping the pedal five times before shutting the engine offApplying the parking brakes, or chocking the wheels when the brakes are very hot or wet in freezing weather

13.Controlled braking means:

Pumping the pedal rapidly to keep the drums coolUsing only the parking brake for gradual stopsApplying the brakes as hard as possible without locking the wheelsBraking only while the clutch is pushed in

14.Some air brake systems include an alcohol evaporator. What job does it perform?

It boosts braking power when the drums get hotIt cleans oil vapor out of the compressed airIt lubricates the s-cams and slack adjusters automaticallyIt puts alcohol into the system to help keep ice from forming in valves and lines

15.Some dash-mounted control handles let you put the spring brakes on a little at a time. Why is that gradual action useful?

It keeps the air compressor from cycling on and off too oftenIt silences the low air pressure warning while you maneuverIt lets you meter the spring brakes yourself if the service brake system quitsIt refills the storage tanks faster than the governor normally allows

16.You always drive a straight truck whose antilock system is working on every axle. In a genuine emergency stop, this permits you to:

Push the brake pedal all the way to the floorCount on a shorter stop than the same truck would make without the systemRelease and re-apply the pedal every time you feel a wheel lockReach for the parking brake control instead of using the pedal

17.Why are the parking and emergency brakes on a truck or bus kept applied by mechanical force rather than by air pressure?

Air pressure can gradually leak awayMechanical force always stops the vehicle in a shorter distanceAir pressure is too strong and would damage the drumsMechanical parts never need to be inspected

18.On a downgrade, you notice you must press harder and harder on the pedal to hold your speed, and the application pressure gauge keeps climbing. What does this pattern suggest?

The governor cut-in setting is too highThe stop light switch has shorted outThe air compressor is over-charging the tanksThe brakes are fading or are out of adjustment

19.In Georgia, what happens if you complete your CDL skills test in a vehicle that is not equipped with air brakes?

Your CDL is issued with a restriction barring you from air-braked vehiclesYou must retake the general knowledge test within 30 daysNothing — the skills test vehicle type does not affect your licenseYour CDL is limited to intrastate driving only

20.Why do air storage tanks equipped with manual drain valves need to be drained at the end of each day of driving?

To reset the governor to its factory cut-out settingTo remove water and compressor oil that could harm the brake systemTo keep the spring brakes from wearing out prematurelyTo relieve extra pressure so the safety valve does not open overnight