CDL AIR BRAKES PRACTICE TEST - WYOMING
21.
If you are driving a 30-foot vehicle at 55 mph, you should leave at least _____ between you and the vehicle ahead.
|
4 seconds
|
|
|
2 seconds
|
|
|
5 seconds
|
|
|
3 seconds
|
22.
Most hydraulic brake failures occur for one of two reasons, one of which is:
|
driving in cold weather.
|
|
|
excessive downshifting.
|
|
|
loss of hydraulic pressure.
|
|
|
relying too much on the engine braking effect.
|
23.
If a load is 10 feet long, the minimum number of tie-downs required is:
|
3
|
|
|
4
|
|
|
2
|
|
|
1
|
24.
The safety valve installed in the first tank the air compressor pumps air is set to open:
|
at 30 psi.
|
|
|
if there is too much pressure.
|
|
|
every 15 minutes.
|
|
|
if there is too little pressure.
|
25.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
|
You may not notice a major leak in the service line until you try to put the brakes on.
|
|
|
if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
|
|
|
The air could leak out of the trailer air tank, releasing its emergency brakes.
|
|
|
None of the above.
|
GRADE ME
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More