IOWA CDL AIR BRAKES PRACTICE TEST
21.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
|
applying and releasing the trailer brakes and listening for the sound of trailer brakes.
|
|
|
shutting the engine off so you can hear the brakes.
|
|
|
All of the above.
|
22.
The air compressor governor:
|
stops the compressor from pumping air.
|
|
|
allows the compressor to start pumping air when the tank pressure rises to the "cut-out" pressure.
|
|
|
controls when the air storage tanks will pump air into the air compressor.
|
23.
After starting the engine, oil pressure should rise to a normal level:
|
within seconds.
|
|
|
within 6 minutes.
|
|
|
within 2 minutes.
|
24.
After a tire has been changed, the driver should stop a short while later to:
|
check the tightness of the nuts.
|
|
|
deflate the tire to 10 psi.
|
|
|
decrease tire pressure.
|
25.
The air compressor stops pumping air into the air storage tanks when air tank pressure rises to around:
|
100 psi.
|
|
|
450 psi.
|
|
|
125 psi.
|
GRADE ME
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More