Ontario Air Brake (Z) Mock Exam 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. How can you confirm the trailer spring brakes have applied?

   1. Gently apply power to see if it holds
   2. Read the date on the trailer's annual decal
   3. Check that the trailer ABS lamp is off
   4. Look for frost forming on the gladhands

2. 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

3. 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

4. How does the brake system of a converter dolly compare with a trailer's?

   1. It has no brakes at all
   2. It has only spring brakes
   3. It uses hydraulic brakes only
   4. It is essentially the same

5. 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

6. 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

7. 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

8. What is the highest actual cut-out pressure allowed?

   1. 120 psi (828 kPa)
   2. 145 psi (1000 kPa)
   3. 175 psi (1207 kPa)
   4. 150 psi (1035 kPa)

9. 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

10. In an S-cam brake, what does the pushrod stroke move first?

    1. The return spring inside the drum
    2. The slack adjuster on the camshaft
    3. The anchor pin mounted in the spider
    4. The brake shoes directly at the drum

11. Is it legal to drive with one brake out of adjustment if the others are fine?

    1. Yes, until the next annual
    2. Yes, on the trailer only
    3. No, it is prohibited
    4. Yes, below 80 km/h

12. During the low-air warning test, what must the ignition be?

    1. Off, with the engine stopped
    2. Off, with the battery disconnected
    3. On; the engine may run or be off
    4. On, with the engine at 1,200 rpm

13. What powers the air compressor on a truck with air brakes?

    1. Pressure stored in the spring brakes
    2. A separate electric motor
    3. The vehicle's engine
    4. The rotation of the trailer wheels

14. Which list matches the parts of a wedge air brake?

    1. Camshafts, rollers, slack adjusters and pads
    2. Rotors, calipers, pads and chambers
    3. Rotors, wedges, rollers and anchor pins
    4. Drums, shoes, spiders, shields and chambers

15. How long should you drain the supply tank during the drain valve check?

    1. Until the low-air light comes on
    2. For exactly ten seconds
    3. Until pressure reaches 60 psi
    4. Until only clean air comes out

16. How should you check a brake chamber for leaks?

    1. With only the spring brakes applied
    2. With the chamber removed from the axle
    3. With the engine off and no air at all
    4. Spring brakes off, service brakes on

17. Why might spring brakes fail to hold a parked truck on a hill?

    1. The governor cut-in is set too high
    2. The air dryer is purging too often
    3. The brakes are out of adjustment
    4. The trailer supply valve is closed

18. What are the metal trailer air line couplers commonly called?

    1. Glad valves
    2. Kingpins
    3. Gladhands
    4. Clevis pins

19. 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

20. 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

21. How much notice must you give to cancel a practical test without a fee?

    1. No notice is needed
    2. At least 7 days
    3. At least 48 hours
    4. At least 2 hours

22. How else can you find a chamber's size if no records are available?

    1. Check the colour of the air line
    2. Clamp diameter or size markings
    3. Read the markings on the tire sidewall
    4. Count the folds in the diaphragm

23. A truck does not comply with the Highway Traffic Act. Who must keep it off the road?

    1. The driver, operator and owner
    2. Only the mechanic who inspected it
    3. Only the vehicle owner
    4. Only the police officer

24. What part makes the compressor stop and start pumping air at set pressures?

    1. The safety valve
    2. The governor
    3. The foot valve
    4. The check valve

25. In Ontario, do you need a Z endorsement to drive a truck with air-over-hydraulic brakes?

    1. No, only full air brakes need it
    2. Yes, it is required
    3. Only if the truck is over 11,000 kg
    4. Only when towing a trailer