General Knowledge
It is illegal to operate a CMV if your blood alcohol concentration (BAC) is above....
.04
how many feet does our vehicle travel during brake lag
32 feet
When performing a tug test, where should the landing gear be
slightly raised
Vehicles required to stop at a railroad crossing must stop how far back from the closest track
15-50 ft
what type of foundation brakes are found on tractors
s cam
Steer tire tread depth shall be no less than
4/32
what controls when our air compressor turns on and off, what psi does it come on and off
governer, on at 100psi, off at 125psi
When are the 2 acceptable times to use the trailer hand valve
test trailer service brakes, test air flow to all trailers
what are the 2 methods of emergency braking
controlled and stab braking
what PSI should the low air warning come on
60psi
Name 3 pieces of emergency equipment that should be found in the vehicle at all times
Fire extinguisher
Fuses
3 red reflective triangles
what does an alcohol evaporator do, how often do we check and fill
keeps air system from freezing, everyday
what color are the service and emergency air lines
service blue, emergency red
Vehicle will travel in a straight line no matter how much the steering wheel is turned
if you switch the air lines on an old trailer, what will happen
you can drive away, but service brakes wont work
one in the front 100ft, 2 in the back at 10ft and 100-500ft
what is the maximum leakage rate for a single vehicle with the brakes applied?
3psi
how long does it take a combination vehicle to cross a double track (railroad)
15 seconds
If placards are needed, what is the minimum number of placards that will be displayed
minimum of 4
if the service line comes apart while driving, what will happen right away?
nothing, but the service brakes will not work properly
3 things that add up to our total stopping distance
perception, reaction, braking distance
what PSI does the trailer air supply valve close/trailer emergency brakes come on
20-45psi
when uncoupling, where should the tractor be when checking to make sure the landing gear is not damaged and the ground is stable
tractor frame should be under trailer
If a hazmat load is not placarded, can it be transported by a driver without a hazmat endorsement
yes. no placards, no endorsement
What is the maximum leakage rate for a combination vehicle with the brakes applied?
4psi