Air brake test 2Question #1 of 26
A dual air brake system has two separate air brake systems, the
first system is called the primary system and the other is called
the secondary system.Top of Form
True
FalseQuestion #2 of 26The braking effect of the engine on a long
steep downgrade should only be a supplement to use of brakes.Top of
Form
True
FalseQuestion #3 of 26All air brake systems have an alcohol
evaporator to put alcohol into the air system.Top of Form
True
FalseQuestion #4 of 26The safety relief valve protects the air
tanks and the rest of the system from building too much
pressure.Top of Form
True
FalseQuestion #5 of 26The air compressor pumps air into the air
storage tanks.Top of Form
True
FalseQuestion #6 of 26When testing the low pressure warning
signal, turn the electrical power on and step on and off the brake
pedal to reduce air tank pressure. The low air pressure warning
signal must come on before the pressure drops to less than ____ psi
in the air tank.Top of Form
30
45
60
90
100Question #7 of 26Which factors will not cause brakes to fade
or fail?Top of Form
A. Brakes can fade or fail from excessive heat caused by using
them too much.
B. Brakes that are out of adjustment.
C. Using the engine brake and not using the brakes often enough
can cause them to fail.
D. Mismatched retread tires on a trailer.
A and B.
C and D.
B and D.
All of the above.
Question #8 of 26What does an alcohol evaporator help
prevent?Top of Form
It helps prevent water leaks.
It helps prevent air in the system.
It helps prevent dirt in the system.
It helps prevent air from leaking.
None of the above.Question #9 of 26
Step on and off the brake pedal to reduce the air tank pressure.
The parking brake knob should pop out when the air pressure falls
to the manufacturers specification. This is how you check which of
the following?Top of Form
This is how you can check that the spring brakes will come on
automatically.
This is how you can check that the slack adjusters are adjusted
properly.
This is how you can check that the supply pressure gage is
working.
This is how you can check that the brake pedal is tuned
properly.
None of the above.Question #10 of 26What can be done to help
prevent oil and water from building up in the air tanks?Top of
Form
Avoid using the brakes in humid weather.
Perform an air brake pump down test 3 times a day.
Keep light pressure on the brakes when driving through
water.
Use an alcohol evaporator.
All of the above.
None of the above.Question #11 of 26The maximum leakage rates
for an air brake system should be less than 2 psi in one minute for
single vehicles and less than 3 psi in one minute for combination
vehicles.Top of Form
True
FalseQuestion #12 of 26A slack adjuster is a lever that connects
the brake chamber push rod with the return spring.Top of Form
True
FalseQuestion #13 of 26Wait for normal air pressure, release the
parking brake, move the vehicle forward slowly and then apply the
brakes firmly using the brake pedal best describes testing the
parking brake.Top of Form
True
FalseQuestion #14 of 26Having ABS brakes only on one axle still
gives you more control over the vehicle during braking than a
vehicle without ABS.Top of Form
True
FalseQuestion #15 of 26Letting up on the brake pedal increases
the air pressure and releases the brakes.Top of Form
True
False
Question #16 of 26Air storage tanks are used to hold compressed
air.Top of Form
True
FalseQuestion #17 of 26
All trucks, tractors, and buses must be equipped with emergency
brakes and parking brakes.Top of Form
True
FalseQuestion #18 of 26Brakes can fade or fail from excessive
heat caused by using them too much and not relying on the engine
braking effect.Top of Form
True
False
Question #19 of 26Pressing and releasing the brake pedal
unnecessarily can let air out faster than the compressor can
replace it.Top of Form
True
FalseQuestion #20 of 26A supply pressure gauge indicates how
much pressure is in the air lines.Top of Form
True
FalseQuestion #21 of 26After the initial charging, the air
compressor should start pumping at about 75 psi and stop at about
100 psi.Top of Form
True
FalseQuestion #22 of 26
The air compressor governor controls when the air compressor
will pump air into the brake safety valves.Top of Form
True
FalseQuestion #23 of 26Spring brakes are powerful springs that
are held back by air pressure. If the air pressure is removed, the
springs put on the brakes.Top of Form
True
FalseQuestion #24 of 26Only a certified mechanic can check slack
adjusters.Top of Form
True
FalseQuestion #25 of 26How often should you drain air tanks?Top
of Form
Every hour or 100 miles.
Every 2 hours or 150 miles.
Every 3 hours or 200 miles.
Every 4 hours or 300 miles.
None of the above.
Question #26 of 26All vehicles with air brakes must have a low
air pressure warning signal.Top of Form
True
False
Final Score: 0%To get a class A commercial drivers license you
need to practice and pass the General Knowledge Test, Air Brake
Test and the Combination Vehicles Test.User Statistics
QuestionYour AnswerCorrect Answer% who Answered this Question
Correctly
What can be done to help prevent oil and water from building up
in the air tanks?UnansweredNone of the above.67%
The air compressor governor controls when the air compressor
will pump air into the brake safety valves.
UnansweredFalse75%
When testing the low pressure warning signal, turn the
electrical power on and step on and off the brake pedal to reduce
air tank pressure. The low air pressure warning signal must come on
before the pressure drops to less than ____ psi in the air
tank.Unanswered6089%
The braking effect of the engine on a long steep downgrade
should only be a supplement to use of brakes.UnansweredFalse59%
What does an alcohol evaporator help prevent?UnansweredNone of
the above.90%
The air compressor pumps air into the air storage
tanks.UnansweredTrue97%
How often should you drain air tanks?UnansweredNone of the
above.92%
Air storage tanks are used to hold compressed
air.UnansweredTrue98%
A supply pressure gauge indicates how much pressure is in the
air lines.UnansweredFalse74%
All air brake systems have an alcohol evaporator to put alcohol
into the air system.UnansweredFalse86%
Only a certified mechanic can check slack
adjusters.UnansweredFalse91%
The maximum leakage rates for an air brake system should be less
than 2 psi in one minute for single vehicles and less than 3 psi in
one minute for combination vehicles.UnansweredTrue91%
The safety relief valve protects the air tanks and the rest of
the system from building too much pressure.UnansweredTrue95%
Letting up on the brake pedal increases the air pressure and
releases the brakes.UnansweredFalse58%
All vehicles with air brakes must have a low air pressure
warning signal.UnansweredTrue97%
Pressing and releasing the brake pedal unnecessarily can let air
out faster than the compressor can replace it.UnansweredTrue90%
Which factors will not cause brakes to fade or fail?UnansweredC
and D.56%
All trucks, tractors, and buses must be equipped with emergency
brakes and parking brakes.
UnansweredTrue97%
After the initial charging, the air compressor should start
pumping at about 75 psi and stop at about 100
psi.UnansweredFalse84%
Spring brakes are powerful springs that are held back by air
pressure. If the air pressure is removed, the springs put on the
brakes.UnansweredTrue93%
Wait for normal air pressure, release the parking brake, move
the vehicle forward slowly and then apply the brakes firmly using
the brake pedal best describes testing the parking
brake.UnansweredFalse83%
Brakes can fade or fail from excessive heat caused by using them
too much and not relying on the engine braking
effect.UnansweredTrue95%
Step on and off the brake pedal to reduce the air tank pressure.
The parking brake knob should pop out when the air pressure falls
to the manufacturers specification. This is how you check which of
the following?
UnansweredThis is how you can check that the spring brakes will
come on automatically.74%
Having ABS brakes only on one axle still gives you more control
over the vehicle during braking than a vehicle without
ABS.UnansweredTrue87%
A slack adjuster is a lever that connects the brake chamber push
rod with the return spring.UnansweredFalse61%
A dual air brake system has two separate air brake systems, the
first system is called the primary system and the other is called
the secondary system.
UnansweredTrue91%
Final Score: 0%To get a class A commercial drivers license you
need to practice and pass the General Knowledge Test, Air Brake
Test and the Combination Vehicles Test.Bottom of FormBottom of
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