Class A license.
What is the distance that you should look ahead of your vehicle while driving?
1 block
How many miles should you look ahead of your vehicle while driving?
1/4
The safety valve is set to automatically reduce pressure at how many psi?
150 psi
The air brake system for a stright truck or bus should not leak at a rate of more than ___ psi per minute with the engine off and the brakes released.
2 psi/minute
The spring brakes used on tractors and straight trucks will bring your truck to a stop when the air pressure drops below __ psi.
20 psi.
The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than
3 psi in one minute
The air brake lag distance at 55 mph on dry pavement adds about __ ft to your stopping distance.
32 ft
You are on a steep downgrade and have reached your safe speed of 40 mph, you would apply the service breaks until you speed drops to___.
35 mph
YOu are driving a 40 ft vehicle at 35 mph. HOw many seconds should you keep in front?
4 seconds.
The driver mus be able to see a warning before air pressure in the service air tanks falls bellow __ psi
55 psi
When bakcing a tractor under a trailer you should:
Always use the lowest reverse gear,
What should you do with your hours of service?
Balance hours of service with enough sleep to keep you alert
When you apply the brakes, the brake shoes/linings are pressed against the:
Brake drum
Break fade can be caused by what
Breaks geting very hard
What is the danger when automatic transmission is forced into a lower hear at high speeds?
Damage to the trasnmission Loss of engine braking effect.
When shipping hazardous materials...
Four-inch diamond shaped hazardous material label must be on the container
What should you do if you have to drive through deep puddles or flowing water?
Gently put on the brakes while driving through the water,.
The total weight of a powered unit, the trailer, and the cargo is called?
Gross combination weight
Where must you keep shipping papers when transporting hazardous materials?
In a pouch on the driver's door or on the seat.
What hsould you do if someone is following you too closely?
Increase your following distance
What do Bridge formulas permit?
Less maximum axle weight for axles that are close together
What kind of vehicle needs more braking power to stop?
Lighter vehicles.
how can you recognize haradous materials?
Look at the label.
What gear do you use to go down a hill?
Lower gear than it took to climb up.
What can cause vehicle fires?
Poor trailer ventilation can cause flammable cargo to catch on fire.
What should you do with ice that is on the radiator shutters?
Remove it.
Before you drive on a curve you should?
Slow down to a safe speed
What kind of laws dictate legal weight limits?
State laws
What happens to brakes when they stop heavier vehicles?
They absorb more heat
Why should you be sure that the 5hth wheel plate is greased as required?
To prevent steering problems
What should you do when starting to move a heavy vehicle on an uphill grade?
Use the parking brake to hold the vehivle until the clutch engages.
What should you do when you see a hazard in the roadway?
Use your 4 way flashers or brke lights to warm others.
What is a good rule to remember when your may colide with another vehicle?
You can almost always turn to miss and obstacle more quickly than you can stop.
All air brake equiped vehicles have:
an air supply pressure gauge.
How should you make turns when roads are slipery?
as carefuly as possible
You have pushed in the trailer supply valve. you should not move the tractor until the whole air system is:
at normal pressure.
Which of the following does not provide extra gears on some trucks? Automatic transmissions Auxiliary transmission multi-speed rear axles
automatic transmission
When you enter a curve you should downshift when?
before you enter the curve
When is the best time to take a break from driving?
before you feel drowsy or tired
Excessive heat in the brakes can cause:
brakes to fade or fail
the usr of air brakes on a downgrade is only a supplement to the
braking effect of the engine
Total stopping distance for vehicles with air brakes is longer than that for vehicles with hydraulic brakes due to
break lag distance
How cna you check the tightness of belts?
by pressing on them
What kind of medicine should not be used while driving?
common cold medicine makes you drowzy
when you get ready to back under a semi trailer, you should line up
directly in front of the trailer
What is a good thing to do when you steer to avoid a crash?
do not turn the steering wheel any more than needed.
What do most serious skids result from?
driving too fast for conditions.
If air pressure does not build up fast enough within the correct amount of time your air pressure may
drop too low during driving.
Modern air brake systems are three different systems combined together. They are the service, parking and the ___ brakes.
emergency
a trailer is most likely to jackknife when it is
empty
How often should you inspect your tires?
every two hours or every 100 miels when driving in very hot weather
There are two things that can prevent a rollover. They are 1: keep the cargo as close to the ground as possible; and 2:
go slow around turns.
Truck escape ramps help with what?
help avoid damage to vehicles
What is an important thing to remember about emergency braking?
if the wheels are skidding you cannot control the vehicle.
Where or how is cargo blocking used?>
in the front, back and or sides of the cargo.
Why should you limit use of your horn?
it can startle other drivers.
You should use your vehicles horn when?
it may help you avoid a crash
You are coupling a semi trailer to your tractor but have not yet baked under it. The trailer is at the right height when:
it will be raised slightly when the tractor is backed under it.
Why should you lock the air line glad hands to eachother (or dummy couplers) when you are not towing a trailer?
it will keep water out of the lines.
What is the first thing alcohol affects?
judgement and self control
Steering wheel should have less than how much % play?
less than 10%
To check the brake slack on s-cam brakes, you should park where?
level ground, chock wheels, and release the parking brakes.
After you have coupled the trailer, you should begin raising the landing gear by using the
low gear.
What can make hydroplanning more likely?
low tire pressure
Compared to a straight truck or bus, there are ___ things to inspect on a combination vehicle.
more
A truck with air brakes going 55 mph would require stopping distance of?
more than 300 ft
After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in the ____ position
normal.
Tires of mismatched sized should
not be used on the same vehicle
When does it take longer to stop?
on slippery roads
to unlock the 5th wheel, pull the release handle to the ___ position
open
For coupling to be completed, the safety catch for the fifth wheel locking lever must be
over the locking lever
What should you do if the break goes to the floor?
pump the break to generate enough pressure to stop the vehicle
If your vehicle has an alcohol evaporator, it is there to:
reduce the risk of ice in the air brake valves in cold weather.
To stop a trailer skid you should
release the brakes.
The best way to tell if your trailer has started to skid is to:
see it in your mirrors.
When driving through roadway work zones you should watch for
sharp pavement drop-offs
If you have a heavy load that is slowing you down on an upgrade, you should
shift into lower gear
retarders can cause the drive wheels to
skid when they have poor traction
The parking or emergency brakes of trucks and buses can be legally held on by ___ pressure.
spring
THe parking or emergency brake on a heavy vehicle can only be held in position by something that cannon leak away, like:
spring pressure
When driving at night, you should drive slow enough to...
stop within the range of your headlights.
What can you use to tell you when to shift?
tachometer
What should you do to stay alert while driving?
take short brakes before you are drowsy.
The air supply pressure gauge shows how much pressure is in
the air tanks
You are driving a vehivle at 55 mph. about how much total stopping distance will you need to bring it to a stop?
the length of a football field.
After you lock the kingpin into the 5th wheel, you should check the connection by pulling:
the tractor ahead gently with the trailer brakes locked.
The front trailer supports are up and the trailer is resting on the tractor. Make sure there is enough clearance between
the tractor frame and the landing gear.
on which fires can you use water?
tire
If you cannot make a turn without entering another traffic lane you should?
turn wide as you complete your turn.
The stop light switch does what?
turns on the brake lights to warm drivers behind you.
How should you check that your service brakes are working properly?
wait for normal air pressure, release the parking brake, move the truck forward slowly, and apply the brake firmly using the break pedal.
IN your mirror, you see a car approaching from the rear. The next time you check your mirro, you dont see the care. To change langes, you should:"
wait until you are sure the car isnt in your blind spot
after you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working you do this by:
wapply/releasing the trailer brakes and listening for brake sounds.
Which peice of emergency equipment shouyld be inside your vehicle?
warning devises for parked vehicles.
Why should you drian water from compressed air tanks?
water can freeze in cold weather and cause brake failure
loose belts will cause what to happen?
water pump and/or fan wont work properly
When should you avoid backing a heavy vehicle?
whenever you can
With air brake vehivcles, the parking brakes should be used:
whenever you leave the vehicle.
How should a burning tire be cooled?
with water.
When you stop on a hill or curve how far should you place your reflective triangles?
within 500 ft behind the vehicle.