Class 3 practice test Flashcards
What is the best way to dry out your brakes after you’ve driven through water?
Apply slight pressure to the brakes for a while
In a vehicle equipped with air brakes, the pushrod stroke occurs when compressed air enters the:
Brake chamber
At vehicle inspection stations, axles are inspected for:
Spacing
After loading a dump truck, what must you do before moving the vehicle?
Secure the material so it will not blow or fall off
A commercial vehicle may not be taller than _________ unless a special oversize permit is obtained.
4.15 meters (13 feet 7 inches)
Where are the air brake chambers located?
At each wheel
Who is allowed to refuel a truck hauling propane?
Only those certified to do so
The low air pressure warning device needs to be replaced or adjusted if it does not activate at a minimum level of
414 kpa (60 psi)
In an air brake system, what does a governor do?
It regulates the air pressures
When is an engine retarder most efficient?
Higher rpm and lower vehicle speeds
What gauges should you check after starting your vehicle?
Oil, voltmeter, coolant temperature, and fuel
Hours of service regulations let a driver choose one of two cycles
7-day or 14-day
In an air brake system, what is brake lag time?
The time between pressing the brake pedal and the brakes engaging
In a vehicle equipped with air brakes, if the air pressure drops below ________, the spring brakes will begin to apply.
414 kpa (60 psi)
In an air brake system, spring brakes are intended for
Parking and emergencies
Which parties are responsible for ensuring the correct and compliant weight of a shipment?
Drivers, carriers, and shippers
Which of the following are normal responses from an antilock braking system (ABS)?
Brake noise, pedal movement, and shutter
Your vehicle is equipped with an air brake system, including a belt-driven air compressor. How do you check for correct belt tension?
Firm hand pressure
Before driving down a grade (hill), you should
Choose an appropriate gear
What is the purpose of the National Safety Code?
To specify minimum safety standards for commercial vehicles, drivers, and carriers
Compared with the service tanks, how much moisture should the supply tank discharge?
More moisture
You’re driving on a curve to the left. How can you ensure that your rear wheels stay in your lane?
Keep your front wheels close to the right edge of your lane
What is a commercial vehicle’s danger zone?
The amount of distance required to stop the vehicle
Why are there two service tanks in a modern air brake system?
For safety
If your vehicle is equipped with antilock brakes (ABS), how should you brake in an emergency?
Press the brake pedal firmly and hold it until your vehicle stops
When must a carrier check your driving record?
Before they hire you and then every year
When brakes become overheated, they also become
Dangerously inneficient
In Canada, how many classes of dangerous goods are there?
9
What is the Gross Vehicle Weight Rating (GVWR)?
The maximum weight of the vehicle and its load
In a vehicle equipped with air brakes, differently sized brake chambers on opposite sides of the same axle can cause
Unbalanced braking
Which colour is the trailer supply line?
Red
What does a driver need to transport dangerous goods?
Training
When must you chock the wheels of your stopped vehicle?
If the park brake isn’t set
Your vehicle is equipped with air brakes. To make sure the air tanks are securely attached to the vehicle, you should
Pull on them
The braking distance of a tractor-trailer is roughly ________ as the braking distance of a car.
Twice as much
Every professional driver must take at least ________ off duty every day.
10 hours
What is the wheelbase of a vehicle?
The distance between the front axle and the rear axle
What must you do at a stop sign with a painted stop line?
Come to a complete stop before the stop line
Your vehicle has tandem drive axles and is equipped with an inter-axle differential. You should NOT use it if
A wheel is spinning
What is the Gross Vehicle Weight (GVW)?
The weight of the vehicle and its load
The maximum length for a straight truck without a special permit is:
12.5 meters (41 feet)
