Class 3 practice test

Question 1

What is the best way to dry out your brakes after you’ve driven through water?

Answer 1

Apply slight pressure to the brakes for a while

Question 2

In a vehicle equipped with air brakes, the pushrod stroke occurs when compressed air enters the:

Answer 2

Brake chamber

Question 3

At vehicle inspection stations, axles are inspected for:

Answer 3

Spacing

Question 4

After loading a dump truck, what must you do before moving the vehicle?

Answer 4

Secure the material so it will not blow or fall off

Question 5

A commercial vehicle may not be taller than _________ unless a special oversize permit is obtained.

Answer 5

4.15 meters (13 feet 7 inches)

Question 6

Where are the air brake chambers located?

Answer 6

At each wheel

Question 7

Who is allowed to refuel a truck hauling propane?

Answer 7

Only those certified to do so

Question 8

The low air pressure warning device needs to be replaced or adjusted if it does not activate at a minimum level of

Answer 8

414 kpa (60 psi)

Question 9

In an air brake system, what does a governor do?

Answer 9

It regulates the air pressures

Question 10

When is an engine retarder most efficient?

Answer 10

Higher rpm and lower vehicle speeds

Question 11

What gauges should you check after starting your vehicle?

Answer 11

Oil, voltmeter, coolant temperature, and fuel

Question 12

Hours of service regulations let a driver choose one of two cycles

Answer 12

7-day or 14-day

Question 13

In an air brake system, what is brake lag time?

Answer 13

The time between pressing the brake pedal and the brakes engaging

Question 14

In a vehicle equipped with air brakes, if the air pressure drops below ________, the spring brakes will begin to apply.

Answer 14

414 kpa (60 psi)

Question 15

In an air brake system, spring brakes are intended for

Answer 15

Parking and emergencies

Question 16

Which parties are responsible for ensuring the correct and compliant weight of a shipment?

Answer 16

Drivers, carriers, and shippers

Question 17

Which of the following are normal responses from an antilock braking system (ABS)?

Answer 17

Brake noise, pedal movement, and shutter

Question 18

Your vehicle is equipped with an air brake system, including a belt-driven air compressor. How do you check for correct belt tension?

Answer 18

Firm hand pressure

Question 19

Before driving down a grade (hill), you should

Answer 19

Choose an appropriate gear

Question 20

What is the purpose of the National Safety Code?

Answer 20

To specify minimum safety standards for commercial vehicles, drivers, and carriers

Question 21

Compared with the service tanks, how much moisture should the supply tank discharge?

Answer 21

More moisture

Question 22

You’re driving on a curve to the left. How can you ensure that your rear wheels stay in your lane?

Answer 22

Keep your front wheels close to the right edge of your lane

Question 23

What is a commercial vehicle’s danger zone?

Answer 23

The amount of distance required to stop the vehicle

Question 24

Why are there two service tanks in a modern air brake system?

Answer 24

For safety

Question 25

If your vehicle is equipped with antilock brakes (ABS), how should you brake in an emergency?

Answer 25

Press the brake pedal firmly and hold it until your vehicle stops

Question 26

When must a carrier check your driving record?

Answer 26

Before they hire you and then every year

Question 27

When brakes become overheated, they also become

Answer 27

Dangerously inneficient

Question 28

In Canada, how many classes of dangerous goods are there?

Answer 28

9

Question 29

What is the Gross Vehicle Weight Rating (GVWR)?

Answer 29

The maximum weight of the vehicle and its load

Question 30

In a vehicle equipped with air brakes, differently sized brake chambers on opposite sides of the same axle can cause

Answer 30

Unbalanced braking

Question 31

Which colour is the trailer supply line?

Answer 31

Red

Question 32

What does a driver need to transport dangerous goods?

Answer 32

Training

Question 33

When must you chock the wheels of your stopped vehicle?

Answer 33

If the park brake isn't set

Question 34

Your vehicle is equipped with air brakes. To make sure the air tanks are securely attached to the vehicle, you should

Answer 34

Pull on them

Question 35

The braking distance of a tractor-trailer is roughly ________ as the braking distance of a car.

Answer 35

Twice as much

Question 36

Every professional driver must take at least ________ off duty every day.

Answer 36

10 hours

Question 37

What is the wheelbase of a vehicle?

Answer 37

The distance between the front axle and the rear axle

Question 38

What must you do at a stop sign with a painted stop line?

Answer 38

Come to a complete stop before the stop line

Question 39

Your vehicle has tandem drive axles and is equipped with an inter-axle differential. You should NOT use it if

Answer 39

A wheel is spinning

Question 40

What is the Gross Vehicle Weight (GVW)?

Answer 40

The weight of the vehicle and its load

Question 41

The maximum length for a straight truck without a special permit is:

Answer 41

12.5 meters (41 feet)