Saskatchewan Air Brake Test 06

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1 / 30

Where is the relay emergency valve mounted?

On the trailer reservoir

Next to a spring brake chamber

Anywhere accessible on the trailer

On the rear axle

2 / 30

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

The two-way check valve

The one-way check valve

The supply line

None of these

3 / 30

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

Only unloaded trailers

Yes

Only if on level ground

4 / 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

5 / 30

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

Together

None of these

Individually

Front before rear

6 / 30

What happens during bobtail proportioning relay valve operation?

The valve locks the brakes

This valve unlocks the air pressure to the brakes

This valve reduces stopping distances

This valve extends stopping distances in an emergency

7 / 30

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

The one-way check valve is closed

The secondary reservoir is full

The one-way check valve is open

The tractor protection system is in working condition

8 / 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 hand valve

The modulator valve

The one-way check valves

9 / 30

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

The tractor tanks to the trailer-brake chambers

The trailer tank to the trailer-brake chambers

The foot valve to the trailer tanks

The tractor tank to the trailer tank

10 / 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...

Non-existent

Stabilized

Increased

Minimized

11 / 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...

40 psi

10 psi

30 psi

20 psi

12 / 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 open-valve type

Any type would do

The closed valve type

13 / 30

How many functions does the relay emergency valve serve?

One

Five

Three

Two

14 / 30

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

The supply line is closed

The foot valve is released

The supply tank is shut off

The supply line is repaired and the system is recharged

15 / 30

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

Pup trailers only

On empty trailers only

Yes

16 / 30

Rupture of the compressor discharge line results in what?

Loss of pressure from the primary reservoir

Loss of pressure from the secondary reservoir

All of these

Loss of pressure from the supply reservoir

17 / 30

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

The supply tanks has compressed air

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

Anytime the foot valve is pressed

The one-way valve is open

18 / 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 slack adjuster

A separation of the supply reservoir to the supply line

19 / 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 off with service brake the supply valve in the open position

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

20 / 30

What happens if the service line is ruptured or disconnected?

There will be a brake fade

There will be a brake failure

All of these

No action will take place until a brake application is made

21 / 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

None of these

The one-way check valve is operational

22 / 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 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

23 / 30

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

The trailer will receive the higher pressure

Both will receive equal pressure

The tractor will receive the higher pressure

Air will exhaust from the lines

24 / 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 the compressor

Depending on the size of reservoirs

Yes

25 / 30

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

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

It bleeds the brakes

It causes a complete brake fade

It does nothing for them

26 / 30

What is a bobtail proportioning relay valve?

None of these

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

27 / 30

What is the main purpose of the trailer supply valve?

It shuts off air flow from the supply reservoir

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

28 / 30

What is referred to as the relay emergency valve?

None of these

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

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

29 / 30

How do you control the trailer brakes independently?

By pulling only the trailer air supply valve out

By turning the hand valve clockwise

By slightly pressing on the foot valve

By pushing only the trailer air supply valve in

30 / 30

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

Automatically shift to the open position

Automatically shift to the closed position

Shift to the emergency position

Remain in the neutral position

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Saskatchewan Air Brake Test 06

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