West Virginia CDL — Air Brakes Practice Test 4

1.It is a cold morning. Your truck has an alcohol evaporator, and its air compressor carries its own oil supply. Which pair of checks does Section 5 add before you drive?

Top up the alcohol container as needed and check the compressor's oil levelEmpty the alcohol container and set the front brake control to 'slippery'Top up the alcohol container and open the safety relief valve by handCheck the compressor's oil level and hand-adjust the automatic slack adjusters

2.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

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.Section 5 ties several problems to hot brakes. Which of these is NOT one of them?

The alcohol evaporator running dryBrake fadeDamage to parking brakes that are set while the brakes are very hotBrakes going out of adjustment quickly

5.Which pairing of an air brake part and where the manual puts it is correct?

Air tank drain valve: at the top of each tankModulating control valve handle: on the trailer's frameABS malfunction lamp on a tractor: on the left rear cornerSafety relief valve: in the first tank the compressor pumps air into

6.Section 5's parking brake control diagram says one driver action both closes the tractor protection valve and sets the spring brakes. Which action?

Pressing the brake pedal all the way downApplying the parking brakesSwitching the front brake control to 'slippery'Turning off the engine

7.West Virginia's license-update instructions, the same ones that cover removing an air brake restriction, list two possible fees. What decides which one you pay?

Whether the vehicle is a Class A or a Class BWhether a knowledge test is requiredWhether the driver is under 21Whether the skills test falls on a weekend

8.After a major leak, the gauge in your straight truck has fallen to 15 psi. Going by the manual's figures, what state should the spring brakes be in?

Fully onStill fully releasedJust starting to dragReleased, because spring brakes need air to apply

9.Which of these is NOT a routine that Section 5 gives the driver?

Draining manually drained air tanks when each day of driving endsChecking the alcohol evaporator's container every day in cold weatherAdjusting automatic slack adjusters by hand before every tripChecking the compressor's oil level before driving when it carries a separate oil supply

10.Which chain of events matches the manual's account of how brake fade develops?

Low tank pressure, then dragging spring brakes, then cooling drums, then hardened liningsHeavy use of the service brakes, then overheating, then chemical changes in the lining and expanding drums, then less friction and weaker contactWet linings, then rust on the drums, then seized slack adjusters, then locked wheelsEngine braking, then compressor overload, then an open safety valve, then air loss