Saskatchewan Air Brake Test 06

Practicing the online test will develop your understanding of important safety protocols and rules that need to be followed while driving large commercial vehicles. Passing your official exam is an achievement that can open up several lucrative opportunities for your career. So, take advantage of this free online test and practice regularly to master the skills needed to become a successful commercial vehicle operator.

1 / 30

Can trailer brakes be used to hold a parked vehicle that is left unattended?

Only unloaded trailers

Only if on level ground

Yes

2 / 30

Rupture of the service line will result in the escape of air pressure if...

Anytime the foot valve is pressed

The supply tanks has compressed air

The brake application is held long enough to cause enough loss of pressure in the tractor system

The one-way valve is open

3 / 30

What is the main purpose of the trailer supply valve?

It supplies air to the trailer's brake system through the supply line

None of these

It vents air out of the air hoses connected to the trailer's brake system

It shuts off air flow from the supply reservoir

4 / 30

What is referred to as the relay emergency valve?

A valve located near the brake chambers to quickly release air pressure

None of these

A valve located next to the compressor to stop air flow in an emergency

A valve located on or near the trailer reservoir on a trailer without spring brakes

5 / 30

Depending on the type of tractor protection system used, air loss from the tractor will stop immediately or it will bleed down to a minimum of...

10 psi

20 psi

30 psi

40 psi

6 / 30

Sudden loss of air pressure in the supply line triggers what?

None of these

The two-way check valve

The supply line

The one-way check valve

7 / 30

Which statement is false? The trailer spring-brake valve is responsible for the following important functions...

The driver will need to manually apply the spring brakes if supply pressure is rapidly lost

It protects and isolates the front-service reservoir from the rear-service reservoir. This is an important feature that prevents an automatic application of the spring-brakes, even though the trailer's service reservoir is lost

It controls application and release of the trailer's spring brakes

It prevents automatic spring-brake application if the trailer's supply line has a gradual leak

8 / 30

How many functions does the relay emergency valve serve?

Three

Five

Two

One

9 / 30

Which of the following are not components of the spring-brake trailer air system?

Rear-service reservoir

Emergency relay valve as used on trailers

Front-service reservoir

Trailer spring-brake valve

10 / 30

How do you control the trailer brakes independently?

By slightly pressing on the foot valve

By pulling only the trailer air supply valve out

By pushing only the trailer air supply valve in

By turning the hand valve clockwise

11 / 30

What happens during bobtail proportioning relay valve operation?

This valve unlocks the air pressure to the brakes

The valve locks the brakes

This valve reduces stopping distances

This valve extends stopping distances in an emergency

12 / 30

What happens if the service line is ruptured or disconnected?

There will be a brake failure

No action will take place until a brake application is made

All of these

There will be a brake fade

13 / 30

Rupture of the compressor discharge line results in what?

Loss of pressure from the primary reservoir

Loss of pressure from the supply reservoir

Loss of pressure from the secondary reservoir

All of these

14 / 30

During emergency applications, the tractor brakes are operable, without air loss, because...

The tractor protection system has isolated the tractor

The spring brakes are prepared

The one-way check valve is operational

None of these

15 / 30

Control pressure causes the relay emergency valve to direct reservoir air from...

The tractor tank to the trailer tank

The trailer tank to the trailer-brake chambers

The foot valve to the trailer tanks

The tractor tanks to the trailer-brake chambers

16 / 30

Drivers can check the operation of the relay emergency valve by doing what?

Closing the supply valve on the tractor or by disconnecting the supply line between the tractor and trailer with the supply valve in the open position

Turning the switch to neutral with the supply valve in the open position

Turning the switch to off with service brake the supply valve in the open position

Turning the switch to regular with the supply valve in the closed position

17 / 30

Trailer-brake application pressure is the same as control pressure, which is the pressure of application air by the foot valve, causing brake lag to be...

Minimized

Increased

Non-existent

Stabilized

18 / 30

During a loss of supply reservoir air, what has prevented primary and secondary reservoir air from escaping back to the supply reservoir and the ruptured line?

The one-way check valves

The hand valve

The modulator valve

The safety valve

19 / 30

A trailer breakaway would result in...

A separation of the supply reservoir to the supply line

A separation of the slack adjuster

A separation of the trailer reservoir to the brake chambers

A separation of the service line and supply line

20 / 30

Is there sufficient reserve air pressure in the primary and secondary reservoirs for a limited number of brake applications to stop the vehicle before the parking brakes are activated?

Yes

Depending on the size of the compressor

Depending on the size of reservoirs

21 / 30

Can you use the hand valve to apply the trailer brakes?

Yes

On empty trailers only

Pup trailers only

22 / 30

Where is the relay emergency valve mounted?

Anywhere accessible on the trailer

On the trailer reservoir

Next to a spring brake chamber

On the rear axle

23 / 30

Air flow during a brake application made with the foot valve has applied the tractor and trailer brakes...

None of these

Together

Front before rear

Individually

24 / 30

What does disconnecting the supply line between the tractor and trailer with the supply valve in the open position do for the driver?

It does nothing for them

It bleeds the brakes

It causes a complete brake fade

Allows them to check the operation of the trailer spring-brake valve

25 / 30

The trailer brakes will remain applied until either the pressure in the trailer reservoir is drained off or...

The supply line is repaired and the system is recharged

The supply tank is shut off

The supply line is closed

The foot valve is released

26 / 30

Loss of pressure in the supply line also causes the trailer-supply valve to do what?

Shift to the emergency position

Remain in the neutral position

Automatically shift to the closed position

Automatically shift to the open position

27 / 30

What is a bobtail proportioning relay valve?

2 two-way check valves housed together

Similar to a one-way valve but housed in a separate housing

A combination of two individual valves in a single housing

None of these

28 / 30

The relay emergency valve must be of what type, so no air is lost from the trailer during a supply-line rupture?

The open-valve type

The closed valve type

The no-bleed-back type

Any type would do

29 / 30

During a supply-line rupture, operation of the tractor brakes will not be affected if...

The tractor protection system is in working condition

The one-way check valve is open

The one-way check valve is closed

The secondary reservoir is full

30 / 30

What happens if the foot valve and the hand valve are operated at the same time?

Both will receive equal pressure

The tractor will receive the higher pressure

The trailer will receive the higher pressure

Air will exhaust from the lines

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Saskatchewan Air Brake Test 06

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