Saskatchewan Air Brake Test 06

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1 / 30

How many functions does the relay emergency valve serve?

Three

Five

Two

One

2 / 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 foot valve is released

The supply line is closed

3 / 30

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

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

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

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

4 / 30

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

The secondary reservoir is full

The tractor protection system is in working condition

The one-way check valve is closed

The one-way check valve is open

5 / 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

6 / 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

7 / 30

A trailer breakaway would result in...

A separation of the supply reservoir to the supply line

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

8 / 30

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

The one-way check valve

The supply line

The two-way check valve

None of these

9 / 30

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

Pup trailers only

Yes

On empty trailers only

10 / 30

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

Emergency relay valve as used on trailers

Rear-service reservoir

Front-service reservoir

Trailer spring-brake valve

11 / 30

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

Air will exhaust from the lines

The trailer will receive the higher pressure

Both will receive equal pressure

The tractor will receive the higher pressure

12 / 30

What is a bobtail proportioning relay valve?

A combination of two individual valves in a single housing

None of these

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

2 two-way check valves housed together

13 / 30

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

Turning the switch to neutral with 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

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

14 / 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 bleeds the brakes

It causes a complete brake fade

It does nothing for them

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

15 / 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 one-way valve is open

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

16 / 30

What happens if the service line is ruptured or disconnected?

All of these

No action will take place until a brake application is made

There will be a brake fade

There will be a brake failure

17 / 30

What is referred to as the relay emergency valve?

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

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

18 / 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

19 / 30

What happens during bobtail proportioning relay valve operation?

This valve extends stopping distances in an emergency

The valve locks the brakes

This valve reduces stopping distances

This valve unlocks the air pressure to the brakes

20 / 30

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

The foot valve to the trailer tanks

The tractor tank to the trailer tank

The trailer tank to the trailer-brake chambers

The tractor tanks to the trailer-brake chambers

21 / 30

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

Front before rear

Individually

Together

None of these

22 / 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

23 / 30

Where is the relay emergency valve mounted?

On the trailer reservoir

Anywhere accessible on the trailer

On the rear axle

Next to a spring brake chamber

24 / 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...

Increased

Stabilized

Minimized

Non-existent

25 / 30

How do you control the trailer brakes independently?

By pulling only the trailer air supply valve out

By pushing only the trailer air supply valve in

By slightly pressing on the foot valve

By turning the hand valve clockwise

26 / 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

20 psi

30 psi

27 / 30

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

Only if on level ground

Yes

Only unloaded trailers

28 / 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 modulator valve

The hand valve

The safety valve

29 / 30

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

The one-way check valve is operational

The tractor protection system has isolated the tractor

The spring brakes are prepared

None of these

30 / 30

Rupture of the compressor discharge line results in what?

Loss of pressure from the secondary reservoir

Loss of pressure from the primary reservoir

All of these

Loss of pressure from the supply reservoir

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Saskatchewan Air Brake Test 06

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