SGI Class 4 Practice Test

All 50 questions in this test

Every question and its answer choices. The correct answers and explanations appear when you take the test above.

1. A truck hauling petroleum must carry what minimum fire extinguisher rating?

   1. One 2A-10 B.C. only
   2. One 3A-40 B.C. or two 2A-10 B.C.
   3. One 20 B.C. or two 10 B.C.
   4. One 5 B.C. or two 2 B.C.

2. What following distance should a taxi or ambulance driver keep in good conditions?

   1. At least one second
   2. At least three seconds
   3. At least two seconds
   4. Exactly one car length

3. During your walk-around you see a rust trail around one wheel nut. What might it mean?

   1. The tire is over-inflated
   2. The hub oil is overfilled
   3. The lug nut may be loose
   4. The brake drum is too thin

4. In a combination with air brakes, what does the foot valve do to the trailer brakes?

   1. Applies them at the same pressure as the tractor's
   2. Applies them at half the tractor's pressure
   3. Applies them only after the tractor stops
   4. Releases them so the tractor does the braking

5. A taxi driver finds a serious brake defect partway through a shift. What should happen?

   1. Drive it slowly to the next fare and back to the garage
   2. Have it towed rather than driven
   3. Tell the next passenger about it
   4. Finish the shift carefully, then report it

6. Who is not allowed to obtain a Class 1, 2, 3 or 4 licence?

   1. A driver who is still a novice
   2. A driver with a farm-plated truck
   3. A driver who holds a Class 5 licence
   4. A driver over 65 years of age

7. How much fuel can an idling class 8 truck engine burn at 900 rpm?

   1. Up to one litre per hour
   2. Up to twelve litres per hour
   3. Up to half a litre per hour
   4. Up to four litres per hour

8. How often does SGI recommend a commercial driver stop to rest?

   1. Only after 13 hours of driving
   2. At least every two hours
   3. At least every four hours
   4. Whenever the fuel tank is half empty

9. A commercial bus operates on trips into Alberta. How often must it be inspected under PMVI?

   1. Every 6 months
   2. Every 24 months
   3. Every 3 months
   4. Every 12 months

10. Your disabled truck sits partly in the lane. Where do the three warning devices go?

    1. About 10 m, 50 m and 100 m behind the vehicle, all in the lane
    2. All three about 30 m behind the vehicle in a straight line
    3. 3 m behind on the traffic side, 30 m behind, 30 m ahead
    4. About 3 m ahead, 3 m behind and 30 m behind

11. An ambulance driver is responding to a call with lights and siren on. Which statement is true?

    1. The driver may ignore all pedestrians
    2. The driver must still use due care for others
    3. The driver is free of any liability
    4. Other drivers must always stop first

12. What must you show for an air brake A endorsement besides passing the written test?

    1. How to reset an ABS controller
    2. How to replace an air compressor
    3. How to adjust a manual slack adjuster
    4. How to rebuild and reseal a service brake chamber

13. On ice and snow, how much longer can stopping distances be than on dry pavement?

    1. Two to three times longer
    2. About 50% longer
    3. Fifteen to 20 times longer
    4. Three to 12 times longer

14. Why is driving in a caravan of trucks prohibited?

    1. It wastes fuel by increasing wind resistance on the lead truck
    2. It confuses drivers at weigh scales ahead
    3. It overloads bridges with too many axles
    4. It leaves too little room to stop and blocks passing

15. How do you test the park brake during the brake response tests?

    1. With it applied, rev the engine hard
    2. With it released, pump the foot brake
    3. With it applied, try to pull ahead gently
    4. With it released, coast down a slope

16. Where is air turbulence from a fast-moving truck most dangerous to a car?

    1. Just in front, beside the fuel tanks, or right behind
    2. Only two or three car lengths behind the rear of the trailer
    3. Only in the opposite lane of a divided road
    4. Only directly beside the truck's cab door

17. When may an emergency vehicle driver disregard the ordinary rules of the road?

    1. Any time the vehicle is on duty in its own area
    2. Any time its lights are flashing, even without a siren
    3. Only between midnight and 6 a.m.
    4. Only on a call, using siren and lights

18. A farmer drives a farm-plated three-axle truck with air brakes. Which licence is needed?

    1. Class 3 with an air brake endorsement
    2. Class 1 with an air brake endorsement
    3. Class 5, with no air brake endorsement
    4. Class 3 without an air brake endorsement

19. How does rising temperature from −18 °C toward 0 °C affect braking on ice?

    1. Braking distance gets shorter as ice softens
    2. Braking distance can double as ice gets slicker
    3. It has no effect once the ice is packed
    4. Braking distance stays the same on sanded ice

20. A driver has taken a sedating medication and then drinks a beer. How do the effects combine?

    1. They add up to the two amounts together
    2. They multiply, causing far more impairment
    3. The medication cancels out the alcohol
    4. Only the alcohol affects driving ability

21. Which item must a trip inspection report include?

    1. The name of the vehicle's insurer
    2. The driver's home address
    3. The vehicle's odometer reading
    4. The weight of the load carried

22. A driver behind you wants to pass. What does SGI advise?

    1. Signal left to show them the road is clear
    2. Speed up so they do not need to pass
    3. Let them decide, then help them complete the pass
    4. Wave them past when you think it is clear

23. Why might other drivers fail to react to your siren in winter?

    1. Cold air makes sirens far louder than in summer
    2. Closed windows make the siren hard to hear
    3. Winter tires drown out the siren
    4. Snow reflects the sound toward them

24. How often may you attempt an SGI commercial knowledge exam?

    1. Once per week
    2. Once per day
    3. Three times per month
    4. Twice per day

25. Above 90 km/h, roughly how much more fuel do you burn for every extra 10 km/h?

    1. About 10% more
    2. About 25% more
    3. About 2% more
    4. About 50% more

26. To avoid a blank stare in traffic, how often should you train your eyes to shift?

    1. About every fifteen seconds
    2. About every five seconds
    3. About every eight seconds
    4. About every two seconds

27. Why walk around the vehicle counterclockwise during a circle check?

    1. So you finish at the passenger door
    2. So you can watch for oncoming traffic
    3. Because the lights are wired that way
    4. So the engine has time to warm up

28. You need to descend a steep grade. Which gear does SGI suggest you choose?

    1. The highest gear, to keep engine rpm low
    2. Neutral, using the service brakes only
    3. Two gears above the one used to climb it
    4. Usually one gear below the one used to climb it

29. You pass an emergency vehicle stopped with its lights flashing on your side of the road. What is the maximum speed?

    1. 60 km/h
    2. 30 km/h
    3. 40 km/h
    4. 80 km/h

30. What does an L restriction on a Saskatchewan licence mean?

    1. No driving outside the province
    2. No Class 2, Class 4 or rideshare vehicles
    3. No passengers for hire in any vehicle
    4. No vehicles with a standard (manual) transmission

31. A truck 2.4 m wide travels outside a town. What warning equipment must it carry?

    1. One flare and a fire blanket
    2. Four orange cones and a flag
    3. Three flares, reflectors or lanterns
    4. Two warning triangles and a flashlight

32. Your truck stalls on a railway crossing and a train is coming. Which way should you move once out?

    1. Along the tracks, away from the train
    2. Back to the cab to keep trying to start it
    3. Away from the tracks, toward the oncoming train
    4. Away from the tracks in the train's direction of travel

33. Where is the PMVI decal placed on a bus or school bus?

    1. On the rear bumper
    2. On the right window
    3. On the left window
    4. On the left front corner

34. You park a tractor-trailer on a grade with no curb. What should you do with the wheels?

    1. Turn them sharply left and set the brakes
    2. Leave them straight and use the trailer hand valve
    3. Leave them straight, set the brakes and block the wheels
    4. Turn them sharply right and hold the unit with the hand valve

35. An emergency vehicle with lights and siren approaches while you are inside an intersection. What must you do?

    1. Stop at once in the middle of the intersection
    2. Keep going at normal speed in your lane
    3. Clear the intersection, then pull right and stop
    4. Reverse out of the intersection quickly

36. You want to tow a travel trailer and a boat that weigh 5,200 kg together, behind a pickup. What do you need?

    1. Only a Class 5 licence
    2. Class 1 or a G endorsement
    3. A Class 4 licence
    4. An A endorsement

37. Why does an under-inflated tire raise the risk of hydroplaning?

    1. It cannot push water out from under the tread well
    2. It makes the steering wheel too easy to turn
    3. It runs cooler and loses its grip on the road
    4. It lifts the vehicle higher off the road surface

38. You are climbing an upgrade below the traffic speed and a passing lane is provided. What should you do?

    1. Use the shoulder until the crest
    2. Turn on hazard lights and keep your lane
    3. Stay in the left lane to block tailgaters
    4. Keep to the right lane

39. During your trip inspection you find a major defect. What does the law require?

    1. Do not drive until it is repaired
    2. Drive only to your planned destination
    3. Repair it before the next day's inspection
    4. Report it on the post-trip inspection

40. Why do brakes lose power after long, hard use on a downgrade?

    1. The brake fluid freezes in the lines
    2. The linings swell and lock the wheels
    3. Hot drums expand away from the linings
    4. The air pressure in the tanks rises too high

41. A rideshare driver carries up to 9 passengers for hire. Which licence class covers this work?

    1. Class 4
    2. Class 2
    3. Class 3
    4. Class 1

42. For the school bus road test, an unrestricted S endorsement needs a bus carrying at least how many student passengers?

    1. 24 student passengers
    2. 36 student passengers
    3. 48 student passengers
    4. 15 student passengers

43. Wear down the centre of a tire's tread usually means what?

    1. The tire has been over-inflated
    2. The wheels are out of balance
    3. The tire has been under-inflated
    4. The tire is a mismatched radial

44. Your truck and trailer measure 17.8 m. Using SGI's method, what is your minimum following count?

    1. 6 seconds
    2. 9 seconds
    3. 4 seconds
    4. 3 seconds

45. Where should you record defects found in a post-trip inspection?

    1. Only in a note left on the dash
    2. On the trip inspection report from that day
    3. On a brand-new report started the next morning
    4. On the bill of lading for the load

46. When should you downshift before going down a hill?

    1. Only if the brakes begin to fade
    2. Halfway down, when speed starts to rise
    3. Before you pass the crest of the hill
    4. At the bottom, before the next climb

47. When should a tow truck driver use the truck's flashing lights?

    1. Whenever the driver wants other traffic to give way
    2. Only when driving faster than traffic
    3. Whenever the tow truck is out on a public road
    4. Only when it or the towed vehicle is a hazard

48. What is the heaviest towed unit a Class 3 truck driver may pull without needing a Class 1 licence?

    1. 11,794 kg
    2. 2,600 kg
    3. 1,360 kg
    4. 4,600 kg

49. A tire is hot after a long run and its pressure reads high. What should you do?

    1. Leave it; check and adjust pressure when cold
    2. Spray it with water to cool it down
    3. Add air so it matches the other tires
    4. Bleed it down to the cold pressure setting

50. How should you approach an intersection where your view is limited?

    1. At normal speed if your light is green, since you have the right of way
    2. At normal speed, sounding the horn
    3. Faster, to clear it before others arrive
    4. At a speed you can stop from, foot over the brake