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WorksheetsPMI air brakes
Total questions: 24
Worksheet time: 48mins
Primary brake circuits are commonly color coded as what color air lines?
Blue
Green
Black
Red
What type of valves are critical devices used to speed up the flow of air during brake applications and release?
Relay
Exhaust
Air brake
Anti-compounding
Two color-coded flexible hoses connect the tractor and trailer air system. What color is used for the supply/emergency circuit?
Yellow
Red
Green
Blue
What type of valve is this?
Quick Release Valve
Relay Valve
ABS Modulator Valve
Safety Valve
What controls air system pressure by stopping and starting compressor loading?
Air dryer
Governor
Air reservoir
Check valves
What type of valve is this?
Quick Release Valve
Relay Valve
Modulator Valve
Safety Valve
Which of the following is the source of power for the air brake system?
Actuator
Primary circuit
Air compressor
Governor
What type of valve removes water and oil that may contaminate supply system air?
Drain
Pressure protection
Inlet pressure regulating
Turbocharger cut-off
Air dryers use a replaceable desiccant cartridge to trap oil and water discharged from the compressor by a process known as _____________.
combustion
pressure-protection
adsorption
consumption
What type of valve is this?
Quick Release Valve
Relay Valve
ABS Modulator Valve
Safety Valve
The trailer control valve should never be used for_____________.
bobtailing
parking
towing
braking
The primary function of _____________valves is to prevent a rapid loss of air from the tractor during a trailer breakaway condition or when either the tractor or trailer develops a severe air leak.
quick-release
tractor protection
trailer brake control
double check
What is the name of this part?
Quick Release Valve
Air Governor
Air Dryer
Safety Valve
Air pressure from the foot valve (signal air) is supplied to a service-control port on the _______valve.
relay
proportioning
quick-release
service brake control
What color is the octagonal-shaped trailer supply valve used to control the tractor protection system?
Red
Blue
Green
Yellow
What is the name of this part?
Quick Release Valve
Air Governor
Air Dryer
Safety Valve
Which of the following are the air couplers attached to the trailer hoses connecting the tractor and trailer air systems?
Circuits
Boosters
Governors
Gladhands
The size & number of _________is determined by the number of axles on the truck/tractor and trailer.
reservoirs
compressors
governors
cylinders
Compressors are normally __________.
located in the cylinder head
engine driven
normally closed
like an in-line filtration system
All of the following defects in the foundation brakes can result in soft braking, EXCEPT:
Select one:
a.Incorrect chamber size and type
b. Excessive tank (reservoir) pressure
c. Damaged, kinked, pinched, or undersized brake hoses and/or lines
d.Incorrect slack adjuster length
Which of the following is an unintended left or right direction change by a vehicle during a brake application?
Select one:
a.Torque balance
b.Brake pull
c.Brake balance
d.Brake timing imbalance
Which of the following is responsible for removing oil passed into the air supply by the compressor?
Select one:
a.Exhaust port
b.Service chamber
c.Air dryer
d.Air reservoir
The air brake system for a straight truck or bus should not leak at a rate of more than _______psi per minute with the engine off and the brakes released.
3
1
2
-
What is NOT a major type of brake systems?
Hybrid Brakes
Truck Brakes
