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

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 shuts off air flow from the supply reservoir

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

2 / 30

Where is the relay emergency valve mounted?

Next to a spring brake chamber

On the rear axle

Anywhere accessible on the trailer

On the trailer reservoir

3 / 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 causes a complete brake fade

It bleeds the brakes

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

It does nothing for them

4 / 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 safety valve

The one-way check valves

The hand valve

The modulator valve

5 / 30

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

The foot valve to the trailer tanks

The trailer tank to the trailer-brake chambers

The tractor tank to the trailer tank

The tractor tanks to the trailer-brake chambers

6 / 30

Rupture of the compressor discharge line results in what?

Loss of pressure from the primary reservoir

All of these

Loss of pressure from the supply reservoir

Loss of pressure from the secondary reservoir

7 / 30

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

The trailer will receive the higher pressure

The tractor will receive the higher pressure

Air will exhaust from the lines

Both will receive equal pressure

8 / 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?

Depending on the size of reservoirs

Depending on the size of the compressor

Yes

9 / 30

A trailer breakaway would result in...

A separation of the trailer reservoir to the brake chambers

A separation of the service line and supply line

A separation of the supply reservoir to the supply line

A separation of the slack adjuster

10 / 30

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

The spring brakes are prepared

The tractor protection system has isolated the tractor

None of these

The one-way check valve is operational

11 / 30

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

The no-bleed-back type

The closed valve type

Any type would do

The open-valve type

12 / 30

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

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

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

13 / 30

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

Only if on level ground

Yes

Only unloaded trailers

14 / 30

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

Together

Individually

Front before rear

None of these

15 / 30

What happens if the service line is ruptured or disconnected?

There will be a brake failure

There will be a brake fade

All of these

No action will take place until a brake application is made

16 / 30

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

Shift to the emergency position

Automatically shift to the open position

Remain in the neutral position

Automatically shift to the closed position

17 / 30

How many functions does the relay emergency valve serve?

Five

Three

Two

One

18 / 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

40 psi

20 psi

30 psi

19 / 30

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

The supply tanks has compressed air

Anytime the foot valve is pressed

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

The one-way valve is open

20 / 30

What happens during bobtail proportioning relay valve operation?

This valve reduces stopping distances

The valve locks the brakes

This valve extends stopping distances in an emergency

This valve unlocks the air pressure to the brakes

21 / 30

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

On empty trailers only

Yes

Pup trailers only

22 / 30

How do you control the trailer brakes independently?

By pushing only the trailer air supply valve in

By slightly pressing on the foot valve

By turning the hand valve clockwise

By pulling only the trailer air supply valve out

23 / 30

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

None of these

The supply line

The two-way check valve

The one-way check valve

24 / 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 line is closed

The foot valve is released

The supply tank is shut off

25 / 30

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

Front-service reservoir

Rear-service reservoir

Emergency relay valve as used on trailers

Trailer spring-brake valve

26 / 30

What is a bobtail proportioning relay valve?

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

None of these

A combination of two individual valves in a single housing

2 two-way check valves housed together

27 / 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 on or near the trailer reservoir on a trailer without spring brakes

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

28 / 30

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

The one-way check valve is open

The one-way check valve is closed

The secondary reservoir is full

The tractor protection system is in working condition

29 / 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

Stabilized

Non-existent

Increased

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

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

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

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Saskatchewan Air Brake Test 06

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