Alberta Class 1–4: Braking and stopping heavy vehicles

All 16 questions in this test

Every question and its answer choices. The correct answers and explanations appear when you take the test above.

1. A loaded truck travels twice as fast as an empty truck half its weight. How much more braking force does it need?

   1. Six times as much
   2. Eight times as much
   3. Twice as much
   4. Four times as much

2. One brake on your unit is out of adjustment. What happens when you stop?

   1. The ABS fixes the difference automatically
   2. The vehicle stops faster because that side grips more
   3. Nothing changes as long as the other brakes are good
   4. The other brakes work harder, so the stop takes longer

3. If you double your speed, how much braking force is needed to stop?

   1. Three times as much
   2. Four times as much
   3. Twice as much
   4. Eight times as much

4. How should you control speed on a long, steep downgrade?

   1. Use the trailer hand valve only, to spare the tractor
   2. Ride the brakes lightly all the way down the hill
   3. Downshift before the crest and use the engine
   4. Shift to neutral and brake firmly

5. About how long is the average perception time before a driver realizes they must stop?

   1. One-quarter of a second
   2. Two seconds
   3. Four-tenths of a second
   4. Three-quarters of a second

6. Which list gives the four factors the guide says affect a commercial vehicle's stopping distance?

   1. Speed, signal use, mirrors and lane
   2. Traction, brake condition, weight and speed
   3. Engine size, gear, load height and tires
   4. Road width, weather, lights and horn

7. Which three driver actions does stopping a moving vehicle involve, in order?

   1. See, think, do
   2. Think, see, do
   3. Brake, steer, signal
   4. Signal, brake, stop

8. Your low air pressure warning comes on while driving. What should you do?

   1. Drive on to the next scale and report it there
   2. Ignore it until the buzzer stops
   3. Keep going and pump the brakes
   4. Stop when safe and build up air

9. Which sum makes up total stopping distance for an air-brake vehicle?

   1. Lag and braking distance only
   2. Reaction and braking distance only
   3. Perception, reaction, lag and braking distance
   4. Perception, reaction and braking distance

10. Why should you not pump air brakes?

    1. It overheats the compressor belt
    2. It locks the spring brakes at once
    3. It is only allowed on dry roads
    4. It wastes air pressure

11. When does a vehicle have the most traction while braking?

    1. Right after the wheels lock
    2. While the wheels are skidding
    3. Just before the wheels lock
    4. When the brakes are released

12. Compared with level ground at the same speed, how does stopping distance change going downhill?

    1. It stays the same
    2. It gets shorter because of weight
    3. It gets longer because of gravity
    4. It gets shorter if the brakes are hot

13. What is brake lag time in an air brake system?

    1. The time from pressing the pedal until a full stop
    2. The delay while air flows to apply the brakes
    3. The time the compressor takes to refill tanks
    4. The time the driver takes to notice the hazard ahead

14. What risk comes from using only the trailer hand valve to slow down?

    1. The tractor brakes overheat first
    2. The ABS light comes on permanently
    3. Unbalanced braking that could cause a jackknife
    4. The trailer brakes adjust themselves too tight

15. A trailer weighing more than how much must have brakes the driver controls?

    1. 2,300 kg
    2. 4,500 kg
    3. 1,500 kg
    4. 910 kg

16. If you double the weight of a vehicle, how much more braking force is needed to stop it?

    1. Twice as much
    2. Four times as much
    3. Eight times as much
    4. The same, thanks to better traction