West Virginia CDL — Air Brakes Practice Test 9

1.The manual warns against setting the parking brakes in two conditions and gives a different consequence for each. Which pairing is right?

Very hot brakes can freeze; very wet brakes in freezing weather suffer heat damageVery hot brakes can burst the air tanks; very wet brakes in freezing weather swell the liningsVery hot brakes can be damaged by the heat; very wet brakes in freezing weather can freeze so the vehicle will not moveVery hot brakes weaken the springs; very wet brakes in freezing weather disable the low air warning

2.On a long downgrade in the proper low gear, a driver whose 'safe' speed is 40 mph keeps light, steady pressure on the brake pedal the whole way down to hold exactly 40. How does that differ from the manual's technique?

It does not differ, because steady light pressure is the manual's methodThe manual has you stay off the brakes entirely until the bottom of the gradeThe manual has you pump the pedal rapidly without letting speed changeThe manual has you brake firmly enough to drop about 5 mph below the safe speed, release, and repeat once speed climbs back

3.To stay clear of an air brake restriction, a West Virginia applicant has to take the road skills test in an air-braked vehicle. According to the manual, who provides the vehicle for that test?

The DMV regional officeThe third-party examinerThe applicant, because the state does not supply commercial vehicles for the testThe applicant's county sheriff

4.The ABS date for air-braked vehicles other than truck tractors covers trucks, buses and trailers. Which other unit does the manual name under that same date?

Converter dolliesPole trailers onlyFarm tractorsTow trucks

5.A pre-1975 truck with a single air system is idling at about 700 rpm. Its pressure takes four minutes to build from 50 to 90 psi. How does that compare with the typical requirement in the manual?

It passes, because single systems are allowed five minutesIt is too slow, because the typical requirement is within three minutesIt passes, because only dual systems have a buildup standardIt is too fast, which points to a stuck governor

6.You are making an emergency stop with controlled braking when you find you must steer much farther to one side than a small movement of the wheel allows. What does the manual say to do with the brakes?

Hold them at the same pressure and steer anywayPress them all the way down to lock the wheelsRelease them, then get back on them as soon as you canSwitch to the parking brake control

7.Section 2's seven-step inspection ends with a brake check written for hydraulic brakes. For a vehicle with air brakes, which sections does it point you to for the checks to do?

Sections 3 and 4Sections 5 and 6Sections 9 and 10Sections 12 and 13

8.Section 5 says an alcohol evaporator does not replace draining the air tanks every day. What exception does it give?

Vehicles built after 1994Trucks with a dual air systemAny day the temperature stays above freezingSystems with automatic drain valves

9.How does the way the service brakes are applied differ from the way the spring brakes are applied?

Springs apply the service brakes, while air pressure applies the spring brakesAir pressure applies the service brakes, while the spring brakes apply when air pressure is taken awayBoth are applied by air pressure, but from different tanksBoth are applied by springs, but the service brakes use weaker ones

10.A West Virginia applicant scores 78% on the air brakes portion of the CDL knowledge exam. Under the manual's knowledge test rule, is that a pass?

Yes, because 70% is the passing markYes, because 75% is the passing markNo, because the air brakes portion requires a perfect scoreNo, because at least 80% is required