North Dakota CDL — Air Brakes Practice Test 5

11.Compressed air usually carries some water and compressor oil. Where does the manual say they tend to collect, and what is fitted there?

In the brake chambers, where each has a relief portAt the governor, which has a built-in filterIn the bottom of the air tank, where each tank has a drain valveIn the foot valve, which vents them when you brake

12.Something has gone wrong, and tank pressure keeps climbing well past the governor's usual cut-out level. At what pressure does the manual say the safety relief valve typically opens?

100 psi125 psi150 psi200 psi

13.Foundation brakes are used at each wheel. Which type does the manual call the most common?

The wedge brakeThe s-cam drum brakeThe air disc brakeThe hydraulic drum brake

14.Many brake systems are built so that pressing the brake pedal while the spring brakes are on will not damage the brakes. Why does the manual still tell you to make a habit of staying off the pedal?

Pressing the pedal drains the separate parking air tankThe pedal releases the spring brakes on most vehiclesIt wears out the stop light switchSome systems lack that protection, and the protection can fail where it is fitted

15.In stab braking you release the brakes when the wheels lock and reapply once they roll. After the release, how long does the manual say it can take the wheels to start rolling?

No time at allUp to one secondUp to five secondsAbout ten seconds

16.Your truck has a dual air brake system. How does the manual say supply pressure will be shown?

By a single needle that shows the average of both halvesBy separate gauges for the two halves, or one gauge with two needlesBy the application pressure gauge onlyBy a warning light alone, with no gauge

17.North Dakota's manual notes that air brake safety devices vary from one vehicle to the next. What does it say the air brake check procedure is designed to show?

That each safety device works properly while pressure falls from normal to low airThat the compressor can refill empty tanks within a set timeThat the brake linings are thick enough to pass a roadside inspectionThat the trailer brakes apply before the tractor brakes

18.You are in the proper low gear on a long downgrade, and your speed has climbed to your "safe" speed. How hard does the manual say to apply the brakes?

As hard as possible without locking the wheelsLightly and constantly, all the way downAll the way, releasing only when the wheels lockFirmly enough that you feel a definite slowing

19.North Dakota's manual prints the air brake check for both its older vehicle inspection test and the modernized skills test the state began phasing in. How do the two versions break the check down?

The older version lists four parts; the modernized version lists three componentsThe older version lists three components; the modernized version lists four partsBoth versions list three components, in a different orderThe older version lists two components; the modernized version lists five parts

20.The Air Brakes section adds a check to the engine compartment step of the seven-step inspection. If the air compressor is belt-driven, what do you check?

The free travel of each slack adjusterThe condition and tightness of the drive beltThe cut-in pressure of the governorThe fluid level in the alcohol evaporator