Ontario Air Brake (Z) Practice Test 5

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 happens to a vehicle when a wheel locks and the tire skids?

   1. Its air pressure rises
   2. It stops in a shorter distance
   3. It loses steering control and stability
   4. It automatically engages ABS on all axles

2. Spring brakes are designed for which two jobs?

   1. Normal stops and slowing on hills
   2. Anti-lock control and steering
   3. Trailer coupling and uncoupling
   4. Parking and emergency stopping

3. The largest common chamber, a standard type 36, may not exceed which applied pushrod stroke?

   1. 2-1/2 in. (64 mm)
   2. 1-3/4 in. (45 mm)
   3. 2 in. (51 mm)
   4. 2-1/4 in. (57 mm)

4. How can out-of-adjustment brakes be detected?

   1. By watching the low-air warning light
   2. Only by a reliable inspection
   3. By listening carefully while driving
   4. By how the brake pedal feels

5. When is brake lining thickness a defect?

   1. When it is below the prescribed minimum
   2. When it is above half its new thickness
   3. Whenever any wear is visible
   4. Only when metal touches metal

6. How are two gladhands joined?

   1. Screwed together clockwise by hand
   2. Seals together at an angle, then rotated
   3. Pushed straight together until they click
   4. Clamped together with a metal hose clip

7. Which practical-test items are not required when testing on a motor coach?

   1. Chocks, stopwatch and pedal holder
   2. Licence, test fee and medical form
   3. Pushrod marker, stroke gauge, eyewear
   4. Chamber sizes and the chamber types

8. An S-cam brake is which basic kind of brake?

   1. A band brake
   2. A wedge brake
   3. A drum brake
   4. A disc brake

9. Where are DD3 safety actuators commonly used?

   1. On farm tractors
   2. On converter dollies only
   3. On light pick-up trucks
   4. On buses and motor coaches

10. 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

11. On a steering axle, which slack adjuster condition is a defect?

    1. Same length but different brand names
    2. Unequal effective lengths
    3. Different paint colours on each side
    4. Both pushrods attached in the same hole

12. Application pressure rises from 10 psi to 80 psi. What happens to pushrod stroke?

    1. It stays exactly the same
    2. It drops to zero
    3. It increases noticeably
    4. It gets noticeably shorter

13. 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

14. Where should you park to inspect your air brakes?

    1. Away from traffic and other hazards
    2. Beside the fuel pumps
    3. In the right lane with flashers on
    4. On a slight downhill slope

15. Which practical test version is for vehicles with a tractor-trailer air brake system?

    1. Version 1
    2. Version A
    3. Version 3
    4. Version 2

16. Before timing air build-up, what should you do if a trailer is attached?

    1. Drain the trailer tanks
    2. Open the trailer supply valve
    3. Close the trailer supply valve
    4. Apply the trailer hand valve

17. Why do lines at the rear of a lead trailer have manual shut-off valves?

    1. To adjust trailer brake pressure
    2. To drain moisture from the air lines
    3. To stop air loss when unused
    4. To lock the trailer spring brakes on

18. Can a vehicle with a defective air brake system be driven to the next town for repair?

    1. Yes, if the trailer is completely empty
    2. Yes, with the four-way flashers on
    3. Yes, if you stay below 50 km/h
    4. No, it may not be driven on any road

19. How often do many manufacturers recommend draining air tanks?

    1. Weekly
    2. At each annual inspection
    3. Monthly
    4. Daily

20. What is the longest allowed build-up time from 85 to 100 psi?

    1. Five minutes
    2. Two minutes
    3. 30 seconds
    4. Ten minutes

21. Which statement about wedge brakes is correct?

    1. They have fully exposed brake linkage
    2. They are designed to be self-adjusting
    3. They use an S-shaped camshaft head
    4. They are a type of air disc brake

22. One brake on a tractor is not working. What happens to the others?

    1. They apply with less force to balance
    2. They adjust automatically to cover it
    3. Nothing, each wheel brakes independently
    4. They do more work and can overheat too

23. How do you test that the spring brakes can hold the vehicle?

    1. Pump the pedal while they are applied
    2. Apply them while at highway speed
    3. Apply them, then pull gently in low gear
    4. Release them and coast down a hill

24. Before measuring pushrod stroke, what must air pressure be?

    1. At zero, all tanks drained
    2. Below 60 psi, spring brakes applied
    3. Above 90 psi, spring brakes released
    4. Exactly 120 psi, engine running

25. Which tank should you always drain first?

    1. The primary tank
    2. The secondary tank
    3. The supply (wet) tank
    4. The tank nearest the cab