Trailer Air Circuit Quiz

Which component is used to connect the air lines between the tractor and the trailer?

• Relay valves

• Gladhands

• Pressure protection valves

• Trailer reservoir tanks

How many color-coded flexible hoses connect the tractor and trailer air system?

• One

• Two

• Three

• Four

Which color is used for the service brakes in trailer air circuits?

• Red

• Blue

• Green

• Yellow

What color is typically associated with the emergency-trailer supply line?

• Blue

• Green

• Red

• Yellow

Image of gladhand holders on the rear of a tractor, showing the red emergency-trailer supply line on the inside and the service line on the outside.

• The red emergency-trailer supply line is on the inside.

• The service line is on the inside.

• Both lines are on the outside.

• The red emergency-trailer supply line is on the outside.

What is the purpose of gladhand seals?

• To increase speed

• To prevent air leaks

• To reduce noise

• To enhance grip

What is controlled by the trailer brake control valves?

• Fuel flow

• Air pressure delivery

• Electrical current

• Hydraulic fluid

What is the consequence of not inspecting gladhand seals regularly?

• Better performance

• Air leaks

• Reduced noise

• Increased speed

In what situation is the Tractor Protection (TP) valve crucial?

• When the trailer is being loaded

• During a trailer breakaway

• When the trailer is being washed

• During routine maintenance

What does the diagram in the learning material represent?

• A hydraulic system for a car

• A typical air circuit for a trailer

• An electrical circuit for a trailer

• A cooling system for a truck