Ontario Air Brake (Z) Mock Exam 1

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. 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

2. How should you secure the vehicle before the system operation tests?

   1. Any surface, as long as the ABS is on
   2. A downhill slope with the engine idling
   3. Trailer hand valve applied and nothing else
   4. Level ground, spring brakes on, chocks

3. 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

4. What does a driver's air brake component inspection mainly involve?

   1. Measuring each drum's inside diameter
   2. Removing wheels to see the shoes
   3. Looking at visible parts
   4. Taking the brake chambers apart

5. What does the spring brake control valve knob normally look like?

   1. Green and square
   2. Blue and round
   3. Yellow and four-sided
   4. Red and eight-sided

6. 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

7. Why might a driver not notice brakes that are slightly out of adjustment?

   1. Normal driving rarely needs full braking
   2. The ABS light hides the problem
   3. Out-of-adjustment brakes feel stronger
   4. Spring brakes cover the difference

8. 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

9. 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

10. 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

11. In a doubles or triples combination, what air drop per minute is the upper limit?

    1. 5 psi (35 kPa)
    2. 8 psi (55 kPa)
    3. 4 psi (28 kPa)
    4. 6 psi (41 kPa)

12. What happens when you press the brake pedal harder?

    1. The spring brakes apply instead
    2. Higher air pressure reaches the brakes
    3. The compressor cuts out sooner
    4. Air is released from the chambers

13. Before a test that releases the parking brakes, what keeps the vehicle from rolling?

    1. The trailer hand valve
    2. The low-air warning
    3. The tractor protection valve
    4. Wheel chocks or blocks

14. 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

15. After the renewal learning module, what do you bring to DriveTest?

    1. A brand-new medical report form only
    2. Completion certificate and licence
    3. Your last pushrod stroke measurements
    4. A letter from your current employer

16. A standard (round-port) type 30 clamp chamber: past what applied stroke is the brake out of adjustment?

    1. 2-1/2 in. (64 mm)
    2. 1-3/4 in. (45 mm)
    3. 2 in. (51 mm)
    4. 1-3/8 in. (35 mm)

17. What protects unused couplers on the towing vehicle from dirt and water?

    1. Plastic bags over the lines
    2. Dead-end or dummy couplers
    3. The trailer hand valve
    4. The tractor protection valve

18. What is the most common brake chamber size?

    1. Size 12
    2. Size 36
    3. Size 30
    4. Size 20

19. Before you measure anything on a brake assembly, how should it feel?

    1. Hot, right after a hard stop
    2. Warm, so parts are expanded
    3. Damp, after draining the tanks
    4. Cool to the touch

20. If you double your vehicle's weight, what happens to stopping distance?

    1. It becomes four times longer
    2. It triples
    3. It doubles
    4. It stays the same

21. In cold weather, why is moisture in the air system dangerous?

    1. It can freeze and cause brake failure
    2. It thickens the brake fluid
    3. It makes the spring brakes release
    4. It raises the governor setting

22. How do you release DD3 parking brakes?

    1. Push the blue knob, then start the engine
    2. Pull the valve, then pump the pedal twice
    3. Turn the caging bolt one full turn out
    4. Operate the valve, then hold the pedal 3–5 s

23. What do the dash air pressure gauges show?

    1. Pressure inside each brake chamber
    2. Pushrod stroke at each of the wheels
    3. Air temperature inside the compressor
    4. Primary and secondary tank pressure

24. Why are air brakes used on large commercial vehicles?

    1. They send high forces over long distances simply
    2. They never need a daily inspection by law
    3. They work without any engine-driven compressor
    4. They stop faster than any hydraulic system

25. To find the right adjustment limit for a chamber, what must you identify?

    1. The axle weight rating
    2. Its style, type and size
    3. The compressor model
    4. Its colour and age