ASSIGNMENT 3
Textbook Assignment:
Chassis Systems, Electrical and Hydraulic Systems,and Rules of
the Road, pages 3-24 through 5-6.
Learning Objective:
Recognize
the principles and components
of air, airoverhydraulic, and
vacuum brake systems.
31.
An air brake system uses compressed
air to apply the brakes.
1.
True
2.
False
32.
In an air brake system, what
component pumps air into the
storage
1.
The
2.
The
3.
The
4.
The
3-3.
At what
tanks?
governor
evaporator
air compressor
master cylinder pump
pounds per square inch
(psi) of air pressure does a
governor stop the compressor
from pumping air?
1.
30
2.
60
3.
90
4.
120
34.
Compressed air usually contains
water and compressor oil.
1.
True
2.
False
35.
Which of the following components
of an air brake system helps reduce
the risk of ice in air brake
valves?
1.
Safety valve
2.
Treadle valve
3.
Alcohol evaporator
4.
Limiting quickrelease valve
3-6.
Which of the following components
of an air brake system protects
the tank and the rest of the system
from too much air pressure?
1.
The
2.
The
3.
The
4.
The
safety valve
alcohol evaporator
drain cock
slack adjuster
3-7.
When the brake pedal is engaged,
air from the air tank flows through
what component before flowing
through the brake lines connected
to the brake chambers?
1.
Doublecheck valve
2.
Brake pedal valve
3.
Limiting quick-release valve
4.
Hand brake valve
3-8.
Pressing and releasing the brake
pedal unnecessarily may release air
out faster from the air tank than
the compressor can replace it.
1.
True
2.
False
3-9.
A low air warning device should
cut on before the pressure in the
air tank(s) drops lower than what
pressure?
1.
120 psi
2.
90 psi
3.
60 psi
4.
30 psi
310.
On a tractor-trailer equipped with
air brakes, which of the following
components provides the operator
control of the trailing load at all
times?
1.
Master cylinder valve
2.
Hand brake valve
3.
Trailer protection valve
4.
Double-check valve
17