Ontario AZ Licence Practice Test 2026: الاختبار التدريبي 5

1. السؤال 1 من 25

   Which brake chamber size is the most common?

   • AType 30
   • BType 12
   • CType 36
   • DType 6
   أظهر الإجابة

   الإجابة: A. Type 30

   The handbook notes that size 30 is the most common chamber.

2. السؤال 2 من 25

   What do the brake chambers do?

   • ARemove water and oil from the compressed air
   • BTurn air pressure into force on the push rod
   • CStore extra air for the horn and the seats
   • DCool the brakes by blowing air on the drums
   أظهر الإجابة

   الإجابة: B. Turn air pressure into force on the push rod

   Air enters the chamber and pushes a diaphragm, which moves the push rod.

3. السؤال 3 من 25

   The low air warning comes on while you are driving. What should you do?

   • AStop safely as soon as possible and find the cause
   • BClose the trailer supply valve and speed up
   • CKeep driving to the next terminal
   • DPump the brake pedal to build pressure
   أظهر الإجابة

   الإجابة: A. Stop safely as soon as possible and find the cause

   Low pressure means you are losing braking power and spring brakes may soon apply. Stop safely and find the problem.

4. السؤال 4 من 25

   During the mechanical inspection, what do you check on the air compressor?

   • AThe tire pressure on the nearest wheel
   • BThe drive belt condition and tension, and the mounting
   • CThe fuel level and the oil in the fuel tank
   • DThe colour of the paint and the make of the compressor
   أظهر الإجابة

   الإجابة: B. The drive belt condition and tension, and the mounting

   Check the compressor's belt, pulley, mounting, brackets and fasteners.

5. السؤال 5 من 25

   An automatic slack adjuster keeps needing to be re-adjusted. What does that mean?

   • AIt is working normally
   • BThe governor is set too high
   • CThere is a defect that must be repaired
   • DThe tires are under-inflated
   أظهر الإجابة

   الإجابة: C. There is a defect that must be repaired

   Frequent re-adjustment of an automatic slack adjuster points to a defect in the brake.

6. السؤال 6 من 25

   What are the service brakes used for?

   • AParking overnight only
   • BEmergency stops only
   • CHolding the trailer while coupling only
   • DNormal stopping, applied with the brake pedal
   أظهر الإجابة

   الإجابة: D. Normal stopping, applied with the brake pedal

   Service brakes are the brakes you use for normal stops, applied with the pedal.

7. السؤال 7 من 25

   When is a brake considered out of adjustment?

   • AWhen applied push rod stroke is over the limit for that chamber
   • BWhen the push rod moves at all during a brake application
   • CWhen the drum feels warm after a short drive
   • DWhen the brake makes no noise as it applies
   أظهر الإجابة

   الإجابة: A. When applied push rod stroke is over the limit for that chamber

   Any push rod stroke over the chamber's adjustment limit means the brake is defective.

8. السؤال 8 من 25

   Which tests must you pass at DriveTest to get the Z endorsement?

   • AOnly a road test in traffic with air brakes
   • BOnly a vision test and a medical review
   • CA medical exam and a hearing test
   • DAn air brake knowledge test and a practical test
   أظهر الإجابة

   الإجابة: D. An air brake knowledge test and a practical test

   You pass the air brake knowledge test and then book and pass the practical test.

9. السؤال 9 من 25

   What is the job of the tractor protection valve?

   • ATo keep the tractor's air if the trailer is disconnected or breaks away
   • BTo control the trailer's lights and turn signals
   • CTo measure the trailer's weight before you drive
   • DTo protect the tractor's paint from stones thrown by the trailer
   أظهر الإجابة

   الإجابة: A. To keep the tractor's air if the trailer is disconnected or breaks away

   The tractor protection valve prevents air loss from the towing vehicle when no trailer is attached or the trailer lines fail.

10. السؤال 10 من 25

    What is the adjustment limit for a standard type 24 chamber?

    • A35 mm (1-3/8 inches)
    • B57 mm (2-1/4 inches)
    • C45 mm (1-3/4 inches)
    • D64 mm (2-1/2 inches)
    أظهر الإجابة

    الإجابة: C. 45 mm (1-3/4 inches)

    A standard type 24 chamber has a 45 mm (1-3/4 inch) limit.

11. السؤال 11 من 25

    Gladhands connect the air lines between tractor and trailer. Which colour is the supply (emergency) line?

    • ARed
    • BBlack
    • CBlue
    • DGreen
    أظهر الإجابة

    الإجابة: A. Red

    Red gladhands are for the supply (emergency) line and blue are for the service line.

12. السؤال 12 من 25

    Which situation is most likely to cause severe brake fade?

    • AUsing the engine brake on a short hill with an empty trailer
    • BA long downhill run with a heavy load at too high a speed
    • CParking overnight in very cold weather with the spring brakes on
    • DDriving slowly on a flat road in town with many stops
    أظهر الإجابة

    الإجابة: B. A long downhill run with a heavy load at too high a speed

    Long descents, overloading and too much speed can overheat the brakes so badly that you cannot stop.

13. السؤال 13 من 25

    What does the one-way check valve do?

    • AStops air from flowing back out of a tank
    • BLets air flow both ways freely
    • CReleases air when pressure is high
    • DApplies the parking brake
    أظهر الإجابة

    الإجابة: A. Stops air from flowing back out of a tank

    A one-way check valve lets air into a tank but prevents it from flowing back out.

14. السؤال 14 من 25

    Why is the supply tank called the wet tank?

    • AIt collects most of the moisture and oil from the compressed air
    • BIt is mounted under the fuel tank and gets wet in rain
    • CIt is filled with water on purpose to cool the air
    • DIt holds the windshield washer fluid for the cab
    أظهر الإجابة

    الإجابة: A. It collects most of the moisture and oil from the compressed air

    The supply tank receives air first and collects most of the moisture and oil.

15. السؤال 15 من 25

    In the air-loss test, what is the most pressure a tractor and one trailer may lose in one minute?

    • A41 kPa (6 psi)
    • B14 kPa (2 psi)
    • C55 kPa (8 psi)
    • D28 kPa (4 psi)
    أظهر الإجابة

    الإجابة: D. 28 kPa (4 psi)

    A tractor and trailer may lose no more than 28 kPa (4 psi) per minute.

16. السؤال 16 من 25

    What is the lowest allowed governor cut-in pressure?

    • A414 kPa (60 psi)
    • B690 kPa (100 psi)
    • C380 kPa (55 psi)
    • D552 kPa (80 psi)
    أظهر الإجابة

    الإجابة: D. 552 kPa (80 psi)

    The cut-in pressure must not be below 552 kPa (80 psi).

17. السؤال 17 من 25

    What does it mean if a spring brake chamber is caged?

    • AIt has been filled with oil to stop it from rusting
    • BIt is locked so no one can steal the brake parts
    • CIt has a metal cover to keep out snow and road salt
    • DIts spring is held back by a caging bolt, so it will not apply
    أظهر الإجابة

    الإجابة: D. Its spring is held back by a caging bolt, so it will not apply

    A technician can cage the spring with a bolt, for example to move a vehicle in an emergency. The protruding bolt shows it is caged.

18. السؤال 18 من 25

    Who may adjust manual slack adjusters?

    • AOnly certified technicians
    • BAnyone with a wrench
    • CAny driver with a Z endorsement
    • DAny passenger
    أظهر الإجابة

    الإجابة: A. Only certified technicians

    Only certified technicians may adjust manual slack adjusters. Drivers should not try to repair automatic adjusters.

19. السؤال 19 من 25

    What is an alcohol evaporator for?

    • ATo add alcohol vapour to the air and reduce freezing in the system
    • BTo test the driver's breath for alcohol before starting
    • CTo cool the engine on long, steep hills
    • DTo clean the windshield in freezing weather
    أظهر الإجابة

    الإجابة: A. To add alcohol vapour to the air and reduce freezing in the system

    An alcohol evaporator puts alcohol vapour into the air to help stop moisture freezing in the lines and valves.

20. السؤال 20 من 25

    What must Z-endorsed drivers aged 80 or older do every year?

    • ATake a full road test only, with no air brake check
    • BRetake the full air brake course with a fleet owner
    • CNothing extra; renewal is every 5 years as usual
    • DComplete the online module and an air brake practical test
    أظهر الإجابة

    الإجابة: D. Complete the online module and an air brake practical test

    At 80 and older, you must complete the online module and practical test every year.

21. السؤال 21 من 25

    Why should you never try to take apart a spring brake chamber?

    • AThe spring is under very high tension and can injure you
    • BOpening it voids the trailer's registration
    • CIt is full of hot oil that can burn your hands
    • DIt contains a sensor that records brake use
    أظهر الإجابة

    الإجابة: A. The spring is under very high tension and can injure you

    The spring in the chamber is under very high tension. Never try to service or repair it.

22. السؤال 22 من 25

    What is a slack adjuster?

    • AA lever that links the push rod to the brake camshaft
    • BA spring inside the chamber that holds the parking brake
    • CA gauge on the dashboard that shows brake wear
    • DA valve that lets out extra air when pressure is too high
    أظهر الإجابة

    الإجابة: A. A lever that links the push rod to the brake camshaft

    The slack adjuster connects the push rod to the camshaft and increases the braking force.

23. السؤال 23 من 25

    In the air-loss test, what is the most pressure a straight truck, tractor or bus may lose in one minute?

    • A21 kPa (3 psi)
    • B69 kPa (10 psi)
    • C41 kPa (6 psi)
    • D7 kPa (1 psi)
    أظهر الإجابة

    الإجابة: A. 21 kPa (3 psi)

    A single vehicle may lose no more than 21 kPa (3 psi) per minute.

24. السؤال 24 من 25

    What does the letter L stamped on a brake chamber cover mean?

    • AIt is a long-stroke chamber, with a longer adjustment limit
    • BIt is a left-side chamber
    • CIt is a low-pressure chamber
    • DIt is a light-duty chamber that is not allowed on trucks
    أظهر الإجابة

    الإجابة: A. It is a long-stroke chamber, with a longer adjustment limit

    L marks a long-stroke design. Long-stroke chambers have longer adjustment limits than standard ones.

25. السؤال 25 من 25

    After your air brake course, you receive a referral envelope. Within how long must you take it to a DriveTest centre?

    • A1 year
    • B6 months
    • C30 days
    • D2 years
    أظهر الإجابة

    الإجابة: B. 6 months

    Take the referral envelope to a DriveTest centre within 6 months.

لوحة المفاتيح: 1–4 للإجابة، وEnter للسؤال التالي.