MANITOBA AIR BRAKE PRACTICE TEST 04

Air brakes are an essential component of any commercial vehicle operating in Manitoba, Canada. These brakes operate using compressed air to apply pressure to the brake pads, thus bringing the vehicle to a stop.

Air Brake Test - Quiz 4

A relay valve has two uses. Which of the following is one of them?

Discharging the application air near the brake chambers

Reducing the braking effort to the front wheels

Connecting the control (service) and supply (emergency) lines of the trailer to the tractor

Release the brakes quicker when a brake application is released.

Question 1 of 30

Which of the following is NOT a component of an air brake system?

A foot valve

A compressor

Spring parking brake chambers

A governor

Question 2 of 30

Which of the following is NOT a component of a spring parking brake system?

Relay valve

Compressor

Front and rear service reservoirs

Trailer spring parking brake valve

Question 3 of 30

What is a reason a medium sized vehicle would use air over hydraulic brakes?

It gives the option of pulling an air brake equipped trailer.

Increase stopping distance

Decrease the vehicle weight

Gain a mechanical advantage

Question 4 of 30

Normally on an S-cam brake with automatic slack adjustment, ________ brake applications of ________ psi per day will keep the brakes properly adjusted.

Two to four, 80-100

Three to five, 40-70

Two, 80-100

One, 100-120

Question 5 of 30

What methods can the driver use to stay aware of the condition of the vehicle's braking system?

Watching the gauges

Listening for warning signals

All of the below

Feeling the brake response of the vehicle

Question 6 of 30

Which of the following is considered the 'brain' of an anti-lock braking system?

Wheel sensor

Electronic control unit

Tooth wheel

ABS valves

Question 7 of 30

Which of the following is NOT true about automatic traction control?

Improves the ability of the driver to manoeuvre the vehicle on slippery surfaces

The system uses two functions: differential braking and electronic engine control

Monitors wheel speed at all times and controls wheel speed while braking

Uses controlled braking to gain traction

Question 8 of 30

The amount of force available at the push rod is consistent out to ____ inches of stroke.

Four

Two

Three

One

Question 9 of 30

A brake chamber is a circular container divided in the middle by a flexible ________.

Slack adjuster

Push rod

Mounting bolt

Diaphragm

Question 10 of 30

On spring brake systems, during full brake application, compounding of the force applied on the slack adjusters and linkage can be said to be a combination of two forces: the force applied by the _________ and the _________.

Spring brakes, service brakes

Service brakes, mounting bolts

Spring brakes, compressor

Clevis, pin

Question 11 of 30

Air that is squeezed into a much smaller space than it normally would occupy is said to be ________.

Canned

Contained

Caged

Compressed

Question 12 of 30

For a vehicle to move along the highway, an internal combustion engine must convert its _____ energy into ______ energy.

Motion, mechanical

Heat, mechanical

Friction, Heat

Mechanical, heat

Question 13 of 30

What will a tractor protection valve with a broken return spring cause?

An emergency brake application on the trailer until a brake application was made

The brake drum to crack or warp.

Brake fade

Loss of air during normal brake applications if operating the tractor without a trailer.

Question 14 of 30

The _______ adjusts the free play in the linkage between the push rod and the brake shoes.

Push rod

S-cam

Slack adjuster

Clevis and pin

Question 15 of 30

What absorbs the heat produced by friction?

Brake lining

Metal brake drums

Diaphragm

Treadle

Question 16 of 30

Braking distance is defined as:

The time it takes from the moment a hazard is recognized to the time the brake is applied,

A combination of driver's reaction time, brake lag, and stopping distance

The time it takes the air to travel through a properly maintained air brake system

The actual distance the vehicle travels after the brake is applied until the vehicle stops

Question 17 of 30

The ________ of the drum brakes determines the amount of _____ they are able to absorb and dissipate into the atmosphere.

Thickness, heat

Width, friction

Diameter, friction

Strength, force

Question 18 of 30

What is the best way to avoid major breakdowns?

Watching the dash gauges

Listening for audible air leaks

Preventative maintenance

Verifying the system is at full pressure

Question 19 of 30

The ________ the air supply is kept, the ______ chance of brake problems.

More compressed, less

Warmer, less

Colder, less

Cleaner, less

Question 20 of 30

What is the function of a 'spitter' valve on a reservoir?

Holds a supply of compressed air

Transmits force in an air brake system

Automatically exhausts moisture from the reservoir when required

Allows the air to flow in one direction only

Question 21 of 30

Ultimately, it is the _______ responsibility to ensure that brakes are adjusted correctly.

Driver's

Technician's

Owner's

Mechanic's

Question 22 of 30

What does a kPa stand for?

Kilogram

Pressure per square inch

Kilometre

Kilopascal

Question 23 of 30

A vehicle carrying a load of 20,000 kg at 20 km/h is brought to a stop in 45 metres with normal application of the brakes. If this same vehicle carried 40,000 kg at 40 km/h, it would require ____ times the braking force to stop the vehicle in 45 metres.

Four

Ten

Two

Eight

Question 24 of 30

The electronic engine control is activated automatically by the ATC if all the wheels begin to slip. What effect does this have?

Brakes applied and released up to five times a second

Air from the trailer reservoir released to the brake chambers.

Causes the limiting valve to operate

Engine power is reduced

Question 25 of 30

What are the two most common slack adjuster problems?

Oversize drums, internal contamination

Lining wear, excessive moisture

Seized shoe anchors, lining wear

Excessive premature wear and internal contamination.

Question 26 of 30

On spring operated parking brakes, during normal operation, air pressure _________ the spring, holding it ready for parking or emergency braking.

Applies

Decompresses

Coils

Cages

Question 27 of 30

On a combination vehicle, what is the first step in a tractor protection valve check?

Release the spring parking brake

Disconnect supply (emergency) line glad hand

Disconnect control (service) line glad hand

Make full brake application

Question 28 of 30

At a truck stop before a downgrade, what needs to be checked before continuing to drive?

That the trailer supply valve is operating properly

That the glad hands and the lines are secure

That the push rod travel is within limitations on all chambers

All of the below

Question 29 of 30

Friction produces what?

Convection

Heat

Lubrication

Air pressure

Question 30 of 30

In Manitoba, drivers must pass an air brake test before obtaining a commercial driver’s license. This test ensures that drivers understand how to properly operate and maintain air brake systems, which is crucial for their safety and the safety of others on the road. Additionally, Manitoba requires annual air brake inspections to ensure all commercial vehicles have functioning air brakes. These inspections help prevent accidents caused by faulty braking systems. Overall, air brakes are a vital aspect of commercial vehicle operation in Manitoba, and they play a critical role in keeping the province’s roads safe and secure for everyone.

Drivingtest.ca has prepared this Air Brake practice test to assist drivers in understanding an air brake system’s essential operation and function. Requirements for Air Brake Endorsement are:

1) Must complete an Air Brake Written Test

2) Must complete an Air Brake Practical Test.

This endorsement permits the holder to drive vehicles equipped with air brakes in the vehicle class for which the driver is licensed.

To successfully prepare, consider utilizing these exams and the official Manitoba Air Brake Manual to your advantage. The more knowledge you can attain, the better it will be for you once you return to the MPI office to take the air brake license written knowledge test.