Manitoba Commercial Practice Test 7

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 are the lowest cut-in and highest cut-out pressures allowed in an air brake system?

   1. Cut-in no lower than 80 psi, cut-out no higher than 120 psi
   2. Cut-in no lower than 100 psi, cut-out no higher than 145 psi
   3. Cut-in no lower than 60 psi, cut-out no higher than 100 psi
   4. Cut-in no lower than 120 psi, cut-out no higher than 150 psi

2. A driver registers a BAC of .06 for the first time, with no children aboard. What suspension applies?

   1. A 15-day licence suspension
   2. A 24-hour suspension only
   3. A 72-hour licence suspension
   4. A three-month suspension

3. In the governor test, which cut-out reading is a defect?

   1. Cut-out at 140 psi
   2. Cut-out at 130 psi
   3. Cut-in at 105 psi
   4. Cut-out below 120 psi

4. How can driving much slower than traffic tempo create a hazard?

   1. It forces traffic to use the shoulder legally
   2. Others may tailgate or pass unsafely and cut in
   3. It stops other drivers from changing lanes
   4. It always saves fuel and lowers risk

5. Which Manitoba licence class covers ambulances and other emergency vehicles?

   1. Class 2
   2. Class 4
   3. Class 3
   4. Class 5 with a medical

6. At a corner where both of your lanes may turn left, which one gives a tractor-trailer the wider arc?

   1. The left-most lane
   2. The lane with fewer vehicles
   3. The right-most lane
   4. Neither; turn from the curb lane

7. Your bus is 11.5 m long. Under ideal conditions, what following count should you use?

   1. Four seconds
   2. Five seconds
   3. Two seconds
   4. Three seconds

8. If you double your speed, what happens to your stopping distance?

   1. It doubles
   2. It increases about four times
   3. It increases eight times
   4. It stays the same with good brakes

9. You find a major defect during your trip inspection. What must happen?

   1. Fix it within seven days and keep driving
   2. Write it on tomorrow's report
   3. Report it at the end of the shift
   4. Report it immediately; the vehicle may not operate

10. About how much air pressure is normally needed to keep spring brakes fully released?

    1. 55 to 60 psi
    2. 70 to 80 psi
    3. 20 to 45 psi
    4. 100 to 120 psi

11. While driving, air pressure drops below the normal cut-in setting. What should you do?

    1. Stop safely as soon as possible
    2. Speed up so the compressor works harder
    3. Keep driving; it will recover
    4. Pump the brakes to raise the pressure

12. At about what speed can tires start to ride up on a wedge of water?

    1. Only above 120 km/h
    2. At any speed on dry roads
    3. About 70 km/h and higher
    4. Below 20 km/h

13. A school bus seats 40 occupants including the driver. What class is needed while carrying passengers?

    1. Class 5 with an S endorsement
    2. Class 4 or higher
    3. Class 2 or higher
    4. Class 3 or higher

14. What is the legal length of a tractor-trailer including its load in Manitoba?

    1. 21.5 m
    2. 12.5 m
    3. 27.5 m
    4. 23 m

15. How must baggage be carried on a public passenger vehicle?

    1. Only on the roof of the vehicle
    2. Beside the driver for supervision
    3. So it cannot block exits or fall on passengers
    4. Stacked in the aisle for quick access

16. When may you cross with the crossing's warning lights flashing?

    1. Only if you sound your horn the whole time
    2. Whenever no train is visible from the cab of your truck
    3. On any highway if you can see a long way in both directions
    4. After stopping, with no gates, in a restricted speed area

17. Inside a service brake chamber, what returns the pushrod when air is released?

    1. A return spring
    2. Air from the secondary tank
    3. The slack adjuster
    4. The parking brake spring

18. Your low-bed trailer snags and shifts a rail at a crossing. What must you do?

    1. Tell your dispatcher at the end of the day
    2. Notify the railway authority right away
    3. Push the rail back yourself and continue
    4. Report it at your next weigh station

19. Why avoid passing when your speed is only slightly higher than the other vehicle's?

    1. It wears out the transmission faster
    2. It is illegal on all Manitoba highways
    3. You stay in the fast lane too long and traffic bunches
    4. The other vehicle must legally speed up while you pass it

20. What can happen if the trailer air lines are cross-connected?

    1. The trailer gets double braking power
    2. Only the trailer lights stop working
    3. Spring brakes may not release; tractor may lose air
    4. The brakes still work normally but make more noise

21. Placards rather than labels are used on containers larger than what capacity?

    1. 1,000 litres
    2. 45 litres
    3. 454 litres
    4. 200 litres

22. Why can lug nuts loosen after a tire has been installed?

    1. The tire pressure slowly pushes the nuts off the studs
    2. Rims heat and cool, which loosens the nuts
    3. Lug nuts always loosen after one trip
    4. Road salt dissolves the nut threads

23. During a trip, how often does MPI suggest checking gauges, tires and cargo?

    1. Every 30 minutes
    2. Every three hours
    3. Once at the end of the day
    4. Every eight hours

24. How can a manual front brake limiting valve help on slippery roads?

    1. It increases front braking for shorter stops
    2. It locks the drive wheels for traction
    3. It turns off the trailer brakes
    4. It reduces front braking to improve steering

25. What must be checked on a bus wheelchair lift during inspection?

    1. Only that the lift is clean
    2. That it lifts more than 500 kg
    3. It completes its cycle and its safety devices work
    4. That it is folded, locked away and cannot be used