Ontario Air Brake (Z) Mock Exam 4

All 25 questions in this test

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

1. What is a good way to pinpoint an air leak in a hose?

   1. Pinch it shut with a pair of pliers
   2. Spray it with a little brake fluid
   3. Move it back and forth and listen
   4. Wrap it tightly with electrical tape

2. You cannot complete the air brake learning module online. What can you do?

   1. Skip it and renew anyway
   2. Take the old written test at home
   3. Ask your employer to sign for you
   4. Complete it in person at DriveTest

3. Which demonstration is part of the MTO air brake practical test?

   1. Changing the governor setting
   2. Measuring applied pushrod stroke
   3. Readjusting a slack adjuster
   4. Replacing a brake chamber

4. What is the most common foundation brake on air-braked commercial vehicles?

   1. The S-cam drum brake
   2. The band brake
   3. The wedge brake
   4. The air disc brake

5. What part serves as the main mounting base for the brake shoes in an S-cam brake?

   1. The clevis pin
   2. The brake spider
   3. The slack adjuster
   4. The dust shield

6. What type of brake chamber do almost all commercial vehicles use?

   1. Welded-shell chambers
   2. Hydraulic wheel cylinders
   3. Clamp-type chambers
   4. Bolt-flange chambers

7. What does a service brake priority trailer guarantee?

   1. Springs release before any air arrives
   2. Service air comes before springs release
   3. The trailer never needs its tanks drained
   4. Brakes apply only through the hand valve

8. Which wheels get air from the primary circuit?

   1. Always the trailer axles first
   2. Always the rear drive axles
   3. Always the front steering axle
   4. It depends on the manufacturer

9. Below what supply-line pressure must trailer spring brakes apply automatically?

   1. 60 psi (414 kPa)
   2. 120 psi (828 kPa)
   3. 20 psi (138 kPa)
   4. 90 psi (621 kPa)

10. Why must compressor brackets and fasteners be kept secure?

    1. So it keeps supplying air reliably
    2. So the governor can cut out much sooner
    3. So the tanks always stay below 80 psi
    4. So the drain valves stay closed while driving

11. When brakes slow a moving truck, what is the vehicle's energy of motion turned into?

    1. Electricity
    2. Heat
    3. Compressed air
    4. Brake fluid pressure

12. When is it safe to get under a vehicle during an inspection?

    1. Only if spring brakes or blocks hold it
    2. Only after the trailer has been uncoupled
    3. Whenever the engine has been shut off
    4. Whenever air pressure is above 90 psi

13. Which three types of foundation brakes does the Ontario air brake handbook describe?

    1. Disc, cone and wedge
    2. S-cam, band and spring
    3. S-cam, disc and wedge
    4. Drum, band and cone

14. Why can a badly overheated brake drum stop touching the brake shoe?

    1. The pushrod retracts when it gets hot
    2. Air pressure falls sharply in hot weather
    3. The hot drum expands away from the shoe
    4. The shoe shrinks as it cools down

15. Which item must you bring to the air brake practical test?

    1. A torque wrench
    2. A tire pressure gauge
    3. Wheel chocks or blocks
    4. A spare brake chamber

16. For the air-loss test, what is the engine and pedal condition?

    1. Engine at 900 rpm, pedal half down
    2. Engine off, pedal held fully applied
    3. Engine off, pedal pumped
    4. Engine idling, pedal released

17. When does an air dryer expel the moisture it has collected?

    1. When the compressor reaches cut-out
    2. Each time the pedal is released
    3. Only when the engine is shut off
    4. When the low-air warning activates

18. Why must you know the size and type of every brake chamber on your test vehicle?

    1. To set the governor cut-out pressure
    2. To find each adjustment limit
    3. To report them to your insurance company
    4. To order spare parts after the test

19. How often does Ontario law require air brake adjustment to be checked?

    1. Once a week
    2. Only at the annual inspection
    3. At least once each day
    4. Once a month

20. Can the trailer hand valve be used to hold a parked combination?

    1. No, never for parking or emergencies
    2. Yes, but only for short stops
    3. Yes, as long as the engine stays running
    4. Only when parked on level ground

21. Since September 1, 2023, what replaces the air brake knowledge test at renewal?

    1. An online air brake learning module
    2. A medical exam
    3. A video quiz at ServiceOntario
    4. A second practical test

22. Should you expect ABS to shorten your stopping distance?

    1. Yes, by about half the distance
    2. Yes, when the trailer also has ABS
    3. No, it prevents lock, not distance
    4. Yes, but only on dry pavement

23. How does Ontario law treat a brake whose stroke is past the adjustment limit?

    1. As a minor issue to note weekly
    2. As acceptable on trailer axles
    3. As normal wear until the next annual
    4. As a defect needing prompt attention

24. Using Method 2, how do you get the applied stroke?

    1. Divide the applied reading by two
    2. Add the two readings together
    3. Use only the released reading
    4. Measurement 2 minus measurement 1

25. Which kind of brake system is used on almost all cars and light trucks?

    1. Air-over-hydraulic brakes
    2. Air brakes
    3. Spring brakes only
    4. Hydraulic brakes