Saskatchewan Air Brake Test 06

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1 / 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

2 / 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

3 / 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 regular with the supply valve in the closed position

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

4 / 30

What happens during bobtail proportioning relay valve operation?

This valve reduces stopping distances

This valve extends stopping distances in an emergency

This valve unlocks the air pressure to the brakes

The valve locks the brakes

5 / 30

How do you control the trailer brakes independently?

By pulling only the trailer air supply valve out

By slightly pressing on the foot valve

By pushing only the trailer air supply valve in

By turning the hand valve clockwise

6 / 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

Non-existent

Stabilized

Minimized

7 / 30

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

Only unloaded trailers

Only if on level ground

Yes

8 / 30

What happens if the service line is ruptured or disconnected?

There will be a brake failure

All of these

No action will take place until a brake application is made

There will be a brake fade

9 / 30

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

Any type would do

The open-valve type

The no-bleed-back type

The closed valve type

10 / 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

11 / 30

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

Trailer spring-brake valve

Emergency relay valve as used on trailers

Front-service reservoir

Rear-service reservoir

12 / 30

Rupture of the compressor discharge line results in what?

Loss of pressure from the supply reservoir

Loss of pressure from the secondary reservoir

All of these

Loss of pressure from the primary reservoir

13 / 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

14 / 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 hand valve

The modulator valve

The safety valve

The one-way check valves

15 / 30

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

Yes

On empty trailers only

Pup trailers only

16 / 30

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

The supply tank is shut off

The supply line is repaired and the system is recharged

The foot valve is released

The supply line is closed

17 / 30

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

The one-way valve is open

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

Anytime the foot valve is pressed

The supply tanks has compressed air

18 / 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 near the brake chambers to quickly release air pressure

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

19 / 30

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

The tractor tank to the trailer tank

The foot valve to the trailer tanks

The trailer tank to the trailer-brake chambers

The tractor tanks to the trailer-brake chambers

20 / 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

21 / 30

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

The supply line

The two-way check valve

None of these

The one-way check valve

22 / 30

How many functions does the relay emergency valve serve?

Two

One

Five

Three

23 / 30

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

Both will receive equal pressure

Air will exhaust from the lines

The tractor will receive the higher pressure

The trailer will receive the higher pressure

24 / 30

What is the main purpose of the trailer supply valve?

None of these

It shuts off air flow from the supply reservoir

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

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

25 / 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

26 / 30

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

None of these

Together

Individually

Front before rear

27 / 30

A trailer breakaway would result in...

A separation of the slack adjuster

A separation of the trailer reservoir to the brake chambers

A separation of the supply reservoir to the supply line

A separation of the service line and supply line

28 / 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

It does nothing for them

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

29 / 30

Where is the relay emergency valve mounted?

On the rear axle

Next to a spring brake chamber

On the trailer reservoir

Anywhere accessible on the trailer

30 / 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

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Saskatchewan Air Brake Test 06

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