Heavy Duty Truck Systems - Chapter 28
UPDATED Exam Questions and
CORRECT Answers
Which of the following air brake system components functions as a lever? - CORRECT
ANSWER - the slack adjuster
Which of the following components sets the system cut-in and cut-out pressures? - CORRECT
ANSWER - the governor
What is the function of a system safety pop-off valve? - CORRECT ANSWER - It relieves
pressure from the supply tank in the event of governor cut-out failure.
The function of the foot valve or dual-circuit application valve is to: - CORRECT
ANSWER - meter air to the service brake circuit
The potential energy of an air brake system is: - CORRECT ANSWER - compressed air
Which of the following components is a requirement on every air tank? - CORRECT
ANSWER - a draincock
What is the minimum total storage volume of air dedicated to brake system requirements of an
air brake-equipped trailer? - CORRECT ANSWER - eight times total chamber volume
The function of an air brake chamber is to: - CORRECT ANSWER - convert the energy of
compressed air into mechanical force
An air brake equipped truck is traveling on a highway at 60 mph and the driver makes a service
brake application. Which of the following should be true in all of the spring brake chambers on
the vehicle? - CORRECT ANSWER - Both the service and hold-off chambers are charged
with air.
UPDATED Exam Questions and
CORRECT Answers
Which of the following air brake system components functions as a lever? - CORRECT
ANSWER - the slack adjuster
Which of the following components sets the system cut-in and cut-out pressures? - CORRECT
ANSWER - the governor
What is the function of a system safety pop-off valve? - CORRECT ANSWER - It relieves
pressure from the supply tank in the event of governor cut-out failure.
The function of the foot valve or dual-circuit application valve is to: - CORRECT
ANSWER - meter air to the service brake circuit
The potential energy of an air brake system is: - CORRECT ANSWER - compressed air
Which of the following components is a requirement on every air tank? - CORRECT
ANSWER - a draincock
What is the minimum total storage volume of air dedicated to brake system requirements of an
air brake-equipped trailer? - CORRECT ANSWER - eight times total chamber volume
The function of an air brake chamber is to: - CORRECT ANSWER - convert the energy of
compressed air into mechanical force
An air brake equipped truck is traveling on a highway at 60 mph and the driver makes a service
brake application. Which of the following should be true in all of the spring brake chambers on
the vehicle? - CORRECT ANSWER - Both the service and hold-off chambers are charged
with air.
