Canada Exam Prep
Saskatchewan Commercial overview

Saskatchewan Commercial Mock Exam 1

Same format as the real test. Answers stay hidden until you submit. The official time limit is not published; the timer is a practice setting.

  • 73 questions
  • untimed
  • Pass mark Class 1 16/20, Class 2 12/15, Class 3 8/10, Class 4 8/10, Air brake 15/18
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Mock exam 1 · Question 10 answered

When should the bus doors be opened at a loading zone?

All 73 questions in this test

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

  1. When should the bus doors be opened at a loading zone?

    1. Just before the bus stops, to save time
    2. Only after the bus has come to a full stop
    3. Whenever passengers stand up to leave
    4. As soon as you begin to slow down

  2. When may a school bus driver back up on school grounds?

    1. Never, even with a guide
    2. Whenever the mirrors show the area is clear
    3. Only before students arrive in the morning
    4. Only when a responsible person is guiding

  3. In a dual-circuit system on a two-axle truck, which brakes does the primary reservoir normally operate?

    1. The spring parking brakes
    2. The trailer brakes only
    3. The front service brakes
    4. The rear service brakes

  4. When turning left with a bus, when do you start turning the wheel?

    1. When the intersecting curb line shows in the front left window
    2. As soon as the front bumper begins to enter the intersection
    3. When the rear wheels pass the stop line
    4. When your mirror shows the cross street

  5. When must the strobe light on a school bus be used?

    1. Only in fog, rain or snow, at any time of day
    2. Only on gravel roads at night
    3. Only while students are loading or unloading at a stop
    4. Whenever carrying passengers outside a town

  6. Where does SGI place a single concentrated load on a straight truck?

    1. Against the cab, standing upright
    2. Over the front axle, on its end
    3. At the tailgate, standing on its end for easy unloading
    4. Just ahead of the rear axle, lying flat

  7. Your overheight load will be taller than 5.2 m. Whom must you check with before moving it?

    1. The nearest weigh scale
    2. SGI's Medical Review Unit
    3. SaskPower and SaskTel
    4. The local fire department

  8. During the in-cab check, how far may the brake pedal travel under heavy force?

    1. No more than 50% of its available travel
    2. No more than 80% of its available travel
    3. No more than 95% of its available travel
    4. All the way to the floor, then release

  9. 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

  10. All air has been lost and the spring brakes have applied. How can the vehicle be moved?

    1. Pump the foot valve several times until the brakes release
    2. Repair and recharge, or cage the springs
    3. Pull the park brake valve out and then push it back in
    4. Use the trailer hand valve to release them

  11. After adjusting, you tap the brake drum with a hammer and hear a dull sound. What does it mean?

    1. The brake is perfectly adjusted
    2. The lining is new and still bedding in
    3. The brake is dragging and needs readjusting
    4. The drum is cracked and must be replaced

  12. When uncoupling, at what point do you stop to dump the tractor air suspension?

    1. Before releasing the fifth-wheel lock
    2. Before lowering the landing gear
    3. After the tractor is fully clear of the trailer
    4. When the kingpin is just clear of the jaws

  13. How far from an intersection should you preferably park when stopping for a break?

    1. 300 m (1,000 ft.) or more
    2. 15 m (50 ft.) or more
    3. 153 m (500 ft.) or more
    4. 50 m (165 ft.) or more

  14. Trailers heavier than what weight must have their own service brakes?

    1. 900 kg (2,000 lb.)
    2. 1,360 kg (3,000 lb.)
    3. 2,000 kg (4,400 lb.)
    4. 4,600 kg (10,141 lb.)

  15. When uncoupling, how far should you lower the landing gear?

    1. Until the trailer lifts fully clear of the fifth wheel plate
    2. Until the trailer is level with the dock
    3. Just until the pads touch the ground lightly
    4. Until most weight is off the tractor, trailer still on the fifth wheel

  16. Of the Class 1 MELT hours, how many are spent behind the wheel?

    1. 47 hours
    2. 57 hours
    3. 30 hours
    4. 17.5 hours

  17. What should come first for a bus driver: the schedule or safe operation?

    1. Safe operation, only in bad weather
    2. The schedule on rural routes
    3. Safe operation, always
    4. The schedule, if passengers complain

  18. What is off-tracking?

    1. Rear wheels following a shorter path than the front wheels
    2. Trailer tires sliding sideways on a wet road
    3. Front wheels drifting toward the outside edge of a sharp curve
    4. The tractor pulling away from the centre line

  19. A typical Class 2 motor coach has at least how many tires and rims to inspect individually?

    1. Four
    2. Eight
    3. Six
    4. Eighteen

  20. With the brakes released, what angle should the slack adjuster arm make with the push rod?

    1. Less than 90°
    2. Exactly 180°
    3. Exactly 45°
    4. Greater than 90°

  21. When may a driver refuse passage to a person who offers the legal fare at a scheduled stop?

    1. When it is full, or the person is drunk or disorderly
    2. When the person has a large suitcase
    3. When the person boards at a rural stop
    4. When the bus is running behind its published schedule

  22. On which public service vehicles may passengers stand?

    1. Any bus on a short route
    2. Any bus under 24 seats
    3. Highway coaches, if seats are full
    4. Only local transit vehicles

  23. When a coupling device other than a fifth wheel is used, what else is needed?

    1. An auxiliary chain or cable as strong
    2. A red flag on the draw-bar
    3. An extra set of trailer mud flaps
    4. A second fifth wheel fitted to the front of the trailer

  24. During offset backing to the driver's side, when do you turn the wheel fully left?

    1. Before you put the unit in reverse
    2. When the tractor tires line up with the landing gear
    3. As soon as the trailer begins to move backward at all
    4. When the rear of the trailer reaches the edge of the stop box

  25. How long should it take the compressor to raise pressure from 85 to 100 psi at 600–800 rpm?

    1. Less than ten seconds
    2. Less than two minutes
    3. Less than five minutes
    4. Exactly three minutes

  26. What is blended air?

    1. Air taken from both the primary and secondary circuits
    2. Air that has passed through the air dryer
    3. Air mixed with oil to lubricate valves
    4. Air from the trailer and tractor tanks together

  27. The supply line to the trailer ruptures. What happens to the trailer brakes?

    1. They go into an emergency application at once
    2. They release completely
    3. They wait until the next foot application
    4. They work only with the hand valve

  28. You drop students at their school on a two-way street. Where should the bus stop?

    1. On the far side, so students cross at the lights
    2. On the school's side, so students step onto the sidewalk
    3. In the school parking lot, backing in
    4. In the centre lane with the stop arm out

  29. What must every trailer equipped with brakes have in case it breaks loose?

    1. A spare set of gladhands kept in a sealed box
    2. A second electrical cord as backup
    3. A reflector on the hitch tongue
    4. A device to apply its brakes automatically

  30. Which items should an en route inspection cover?

    1. Only the mirrors and the windshield
    2. Only the paperwork, the logbook and the bill of lading
    3. Only fluid levels and the fuel tank
    4. Tires, hubs, brakes, couplings, lights, load

  31. Before pulling a bus away from the curb, what should you do besides checking the mirror?

    1. Look over your left shoulder
    2. Open the door to check behind
    3. Flash the headlights twice
    4. Sound the horn three times

  32. What vehicle must you bring for a Class 1 road test?

    1. A school bus with air brakes
    2. A three-axle power unit and a 48 ft or longer trailer
    3. A two-axle truck towing any trailer heavier than 4,600 kg
    4. A tandem tractor without a trailer

  33. What is 'dynamiting'?

    1. An emergency trailer brake application from sudden air loss
    2. A slow, steady leak from the service line under braking
    3. Pumping the brakes rapidly to stop on glare ice
    4. Charging the trailer system to full reservoir pressure

  34. Why is a relay valve installed near the rear brake chambers of a long vehicle?

    1. To reduce brake lag at the rear wheels
    2. To lower air pressure to the front brakes
    3. To hold the brakes on when parked
    4. To dry the air before it reaches the brakes

  35. How should safety chains be attached between a converter dolly and the lead trailer?

    1. Crossed under the tongue
    2. Left hanging loose for turning
    3. Wrapped around the pintle hook
    4. Attached to the dolly axle only

  36. What may a bus driver not do while the vehicle is moving?

    1. Collect fares or load and unload passengers
    2. Use the mirrors to watch passengers
    3. Adjust the heater or ventilation
    4. Answer a passenger's urgent question

  37. When passing on a highway, what sight distance should a school bus driver have?

    1. At least 50 seconds
    2. At least 20 seconds
    3. At least 2 minutes
    4. At least 10 seconds

  38. A typical Class 1 combination has at least how many tires and rims to inspect?

    1. 10
    2. 22
    3. 8
    4. 18

  39. How does the Class 1 trip inspection test differ from Classes 2 to 4?

    1. You inspect a random block of components and describe defects
    2. You inspect the trailer only, not the tractor
    3. You may use a checklist from the examiner
    4. You only answer written questions about inspections

  40. Who must supply the placards and product identification number to the first carrier?

    1. The driver's employer
    2. The consignor (shipper)
    3. The consignee (receiver)
    4. The provincial highway ministry

  41. How should you attach the converter dolly tongue to the pintle hook?

    1. By leaving the safety latch open for turns
    2. By backing into it at speed
    3. By hand, then fasten the latch, chain and pin
    4. With the trailer hand valve applied

  42. What is the purpose of the one-way check valve between the supply and service reservoirs?

    1. It warns the driver of low pressure
    2. It stops air flowing back if the supply side fails
    3. It lets air flow both ways to balance tanks
    4. It releases excess pressure into the air

  43. How should you fight a fire under the hood of your truck?

    1. Throw the hood fully open so you can reach all of the flames
    2. Pour water through the grille onto the engine
    3. Leave the engine running to blow out the fire
    4. Open the hood only slightly and aim the extinguisher in

  44. What is a trailer jackknife?

    1. The rear of the trailer swings around
    2. The kingpin breaks loose from the fifth wheel
    3. The trailer tips onto its side
    4. The tractor's rear skids sideways

  45. After connecting the air lines, how do you supply air to the trailer?

    1. Pull out the yellow parking brake valve
    2. Open the draincock on the trailer tank
    3. Apply the trailer hand valve fully
    4. Push in the red trailer supply valve

  46. Why should you release the parking brakes before a full foot-brake application test?

    1. To avoid compounding the forces on the brake parts
    2. To keep the low air warning from sounding
    3. To stop the trailer from rolling forward
    4. To let the compressor cut in sooner

  47. The safety valve on the supply reservoir blows off air. What does this indicate?

    1. A problem with the governor
    2. A worn brake lining
    3. Normal operation in cold weather
    4. A leak in the service line

  48. How can you apply the trailer brakes without the tractor brakes?

    1. Press the foot valve lightly
    2. Turn on the engine retarder
    3. Use the trailer hand control valve
    4. Pull the yellow parking brake valve

  49. What can over-braking in a curve or on ice cause with a tractor-trailer?

    1. The fifth wheel to unlock
    2. The air dryer to freeze up
    3. The trailer to overheat its tires
    4. A jackknife or skid

  50. 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

  51. Reflective tape along each side of a trailer must cover at least how much of its length?

    1. 100%
    2. 25%
    3. 75%
    4. 50%

  52. You are hauling gravel in an open box. What should you do?

    1. Drive slower than 60 km/h instead
    2. Fill the box only to the halfway mark
    3. Cover the load completely with a tarp
    4. Wet the gravel so it stays in place

  53. During a Class 2 bus trip inspection, what must you check at the emergency exits?

    1. They are locked so passengers cannot open them
    2. They open and close properly and the alarm works
    3. Only the roof hatch, since doors are checked daily
    4. They are covered to keep out dust and cold

  54. What does a quick-release valve do?

    1. Opens the safety valve when pressure is high
    2. Applies the brakes faster in an emergency
    3. Exhausts air near the chamber to release brakes faster
    4. Lets the driver release the spring brakes

  55. During the Class 1 trip inspection, what must be true of the fifth-wheel locking handle?

    1. It is in the locked position
    2. It is removed and stowed in the cab
    3. It is tied back with wire
    4. It is pulled out for easy release

  56. On a highway curve to the left, where should you keep the front wheels?

    1. In the middle of the lane
    2. Over the centre line slightly, to give the rear wheels room
    3. Close to the right edge
    4. Close to the centre line

  57. What is the last coupling step SGI lists before driving away?

    1. Pull ahead and test trailer brakes with the hand valve
    2. Release the tractor air suspension and leave it lowered
    3. Lower the landing gear back down to the ground for support
    4. Disconnect the electrical cord to test it

  58. 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

  59. On a type 30 chamber, at how much slack must a brake be adjusted?

    1. 1/4 inch (6.4 mm)
    2. 2 1/2 inches (63.5 mm)
    3. 2 inches (50.8 mm)
    4. 1 inch (25.4 mm)

  60. You drive a tractor without a trailer and it has no dead-end couplers. What should you do with the gladhands?

    1. Let them hang free behind the cab so they drain
    2. Tape over the openings with duct tape until needed
    3. Lock the service and supply gladhands together
    4. Disconnect them from the tractor

  61. Why are spring brakes a reliable parking brake?

    1. They use the highest air pressure in the system
    2. They can only be released with a wind-off bolt
    3. They lock the transmission as well as the wheels
    4. They are held on by spring pressure and need no air

  62. What can happen if you use an engine retarder on a slippery road?

    1. The drive wheels may lock and the unit may jackknife
    2. The retarder will switch off the ABS system
    3. The trailer brakes will apply on their own and stay applied
    4. The air tanks will lose pressure quickly

  63. Backing a tractor and semi-trailer, which way do you turn the tractor's front wheels to move the trailer's rear left?

    1. Straight, letting the trailer find its path
    2. Fully left, then fully right in quick turns
    3. To the left, the same as the desired direction
    4. To the right, opposite the desired direction

  64. Which manoeuvres are added to the Class 1 road test?

    1. Parallel parking on a city street and a hill start only
    2. Offset and alley dock backing, coupling and uncoupling
    3. A U-turn in town and a reverse slalom
    4. A skid pad recovery test and a controlled emergency stop

  65. Apart from pole trailers, what is the maximum length of a draw-bar between a motor vehicle and trailer?

    1. 1.83 m (6 ft.)
    2. 4.6 m (15 ft.)
    3. 0.9 m (3 ft.)
    4. 3.05 m (10 ft.)

  66. Your tractor-trailer starts to skid. When might gentle use of the hand valve help?

    1. Whenever the road is icy
    2. When the tractor skids, to help straighten the unit
    3. Only to hold the unit still when parked on a grade
    4. When the trailer is skidding sideways behind you

  67. What does a bobtail proportioning relay valve do when no trailer is attached?

    1. Raises service pressure to the drive axle for shorter stops
    2. Lowers service pressure, so you press the pedal farther
    3. Shuts off the front brakes completely
    4. Applies the spring brakes automatically

  68. At a bus stop, how far from the waiting students should the bus stay?

    1. At least 10 cm
    2. At least 1 m (3 ft.)
    3. At least 5 m (15 ft.)
    4. Right beside them at the curb

  69. What does a converter dolly do?

    1. Lifts an axle off the road when empty
    2. Converts a semi-trailer into a full trailer
    3. Links two tractors for heavy hauling
    4. Converts a tractor into a straight truck

  70. Which event must be reported immediately by the person in charge of dangerous goods?

    1. A detour around road construction
    2. A change of driver at a rest stop
    3. A delay of one hour at a weigh scale
    4. Any leak or escape from a container

  71. In winter, how often should you drain the air tanks?

    1. Only when the low air warning sounds
    2. Once a month during cold weather
    3. Daily, leaving them empty when not in use
    4. Only when water is seen at the gladhands

  72. Signs allow two lanes to turn left. Which lane should a tractor-trailer use?

    1. Both lanes at once
    2. The lane furthest to the left
    3. Whichever lane has less traffic
    4. The lane furthest to the right

  73. Before entering a provincial highway, how far from the travelled portion must a school bus stop?

    1. Not less than 1 m and not more than 3 m
    2. Not less than 15 m and not more than 30 m
    3. Exactly at the shoulder line
    4. Not less than 4 m and not more than 10 m

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