1.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
100 to 120 psi
|
|
10 to 20 psi
|
|
20 to 45 psi
|
2.
A trailer jackknife is more likely to happen when the trailer is:
loaded to its full capacity.
|
|
empty.
|
|
overloaded.
|
3.
Inspecting the fifth-wheel does NOT include:
checking for missing or damaged parts.
|
|
backing until the fifth-wheel just touches the trailer.
|
|
checking that there are no cracks in the frame.
|
4.
Transporting hanging meat requires special attention. Why?
Because hanging meat can be an unstable load with a high center of gravity.
|
|
Because you have to drive fast to get it delivered fresh.
|
|
Because refrigerated trucks have less traction.
|
5.
Overloading can have negative effects on:
steering.
|
|
braking.
|
|
All of the above.
|
6.
When backing a trailer on a curved path you should back towards:
either side.
|
|
the driver's side.
|
|
neither side (back up straight).
|
7.
The use of brakes on a steep downgrade is:
a supplement to the braking effect of the engine.
|
|
the main braking factor.
|
|
much more effective than the engine braking effect.
|
8.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
prevent movement of cargo.
|
|
keep from rolling back.
|
|
hold compressed air.
|
9.
If the safety relief valve in the air brake system releases air:
the valve is fully operational.
|
|
this will supply more power to the brakes.
|
|
something is wrong.
|
10.
When driving at night you should:
use your high beams when it is safe and legal to do so.
|
|
always use low beams.
|
|
All of the above.
|
Next page
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More
Rate This Free Test