Canada Exam Prep
Saskatchewan Commercial overview

Saskatchewan Commercial Mock Exam 3

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
0/73
Mock exam 3 · Question 10 answered

In a train, the rear trailer starts to fishtail. What does SGI recommend?

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. In a train, the rear trailer starts to fishtail. What does SGI recommend?

    1. Brake hard with the foot valve and steer away from the swing
    2. Steer sharply against the swing
    3. Lightly apply trailer brakes and add power
    4. Release power and coast to a stop

  2. When does the service line contain air?

    1. Whenever the trailer-supply valve is open
    2. Only when a brake application is made
    3. Whenever the engine is running
    4. Only when the parking brakes are applied

  3. 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

  4. 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

  5. What determines how much heat a brake drum can absorb?

    1. The width of the tire tread
    2. The colour of the drum paint
    3. The thickness of the metal
    4. The length of the slack adjuster

  6. If you double your speed, how much braking force do you need to stop in the same distance?

    1. Eight times as much
    2. Three times as much
    3. Four times as much
    4. Twice as much

  7. Which of the six driving conditions does SGI call the most important?

    1. Driver condition
    2. Road condition
    3. Weather condition
    4. Vehicle condition

  8. At what pressure must the low air warning activate?

    1. Below 100 psi (690 kPa)
    2. Below 45 psi (310 kPa)
    3. Below 20 psi (138 kPa)
    4. Below 60 psi (414 kPa)

  9. What is the maximum length of a B-train?

    1. 27.5 m
    2. 23 m
    3. 26 m
    4. 30 m

  10. At what supply-line pressure does the tractor protection valve open its service-line port?

    1. 60 psi
    2. 20 psi
    3. 45 psi
    4. 100 psi

  11. 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

  12. 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

  13. While you are in the cab, where must the dangerous goods shipping document be?

    1. Within reach or in the driver's door pocket
    2. In the toolbox under the bunk
    3. Inside the trailer with the load
    4. Locked in the glove box or the sleeper cabinet

  14. With no guide available, what should you do before backing?

    1. Back in one long move to save time
    2. Rely on mirrors without leaving the cab
    3. Set the brake, get out and check the area
    4. Back quickly to limit time in the danger area

  15. 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

  16. How must different classes of livestock be transported together?

    1. Tied together to stop them shifting
    2. Loaded with the largest animals at the front
    3. Separated by a partition
    4. Only with a veterinarian on board

  17. 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

  18. 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

  19. 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

  20. At what point in a turn is mirror vision of a tractor-trailer most limited?

    1. When the front wheels first begin to turn
    2. When the trailer is straight behind the tractor
    3. When the tractor is at its sharpest angle to the trailer
    4. When the unit has fully completed the turn and straightened out

  21. Which valves separate the primary and secondary reservoirs from the supply reservoir?

    1. Relay valves
    2. Quick-release valves
    3. One-way check valves
    4. Safety valves

  22. 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

  23. 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

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

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

  25. What does a front axle ratio valve do during light brake applications?

    1. Reduces pressure to the front brakes
    2. Doubles the application pressure to the front brakes
    3. Shuts off the rear brakes
    4. Applies only the trailer brakes

  26. 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

  27. 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

  28. 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.)

  29. How are spring brakes applied and released?

    1. Applied by hydraulic fluid, released by air
    2. Applied and released by air pressure
    3. Applied by spring force, released by air pressure
    4. Applied by air pressure, released by spring force

  30. 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

  31. 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

  32. With air ride suspension, what do you do with the tractor suspension as you back under the trailer?

    1. Dump it and leave it down while driving away from the yard
    2. Leave it unchanged the whole time
    3. Dump it, then restore normal height
    4. Raise it to the highest setting first

  33. 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

  34. How does a longer wheelbase affect off-tracking?

    1. It increases the amount of off-track
    2. It has no effect on off-tracking
    3. It reduces the amount of off-track
    4. It removes off-track on gentle curves

  35. How should you connect gladhands?

    1. Clean them, put the seals together at 90° and snap down
    2. Line them up straight and twist clockwise
    3. Connect them with the engine stopped and tanks empty
    4. Grease the rubber seals heavily first

  36. What is the job of the air compressor?

    1. To build up and maintain air pressure
    2. To remove water from the air supply
    3. To apply air to the brake chambers
    4. To store air for several brake stops

  37. 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

  38. 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

  39. Before backing under a trailer, how should the fifth wheel look?

    1. Dry, with all grease wiped off
    2. Slide pins pulled out and unlocked
    3. Horns tilted down and jaws unlocked (open)
    4. Horns tilted up and jaws locked

  40. 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

  41. 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

  42. 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

  43. 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

  44. After you hear the fifth wheel lock, how should you confirm the coupling?

    1. Drive one block and then check it
    2. Rock the trailer with the landing gear
    3. Listen for the air dryer to purge
    4. Do at least two tug tests and look at the jaws

  45. Your permit allows a heavier load, but a bridge sign posts a lower weight limit. What applies?

    1. The sign applies only at night
    2. The posted sign must be obeyed
    3. Either one, at the driver's choice
    4. The permit overrides the sign

  46. Which function belongs to the relay emergency valve on a trailer?

    1. It dries the air before it reaches the trailer tank
    2. It controls the tractor's spring parking brakes
    3. Applies the trailer brakes if the supply line parts
    4. It lowers pressure to the trailer's front axle

  47. 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

  48. 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

  49. When may a school bus driver leave students alone on the bus?

    1. Only for less than five minutes at a scheduled stop
    2. Only if an older student is left in charge of the others
    3. Never, under any circumstances
    4. With an interlock set, or engine off, key out, brake on

  50. A taxi driver's annual criminal record check comes back unsatisfactory. What restriction may SGI add?

    1. L restriction: no Class 2 or 4 vehicles
    2. A restriction: no air brake vehicles
    3. T restriction: no passengers for hire
    4. W restriction: no driving in the United States

  51. How many hours of Mandatory Entry-Level Training does a Class 1 applicant need before the road test?

    1. At least 40 hours
    2. At least 80 hours
    3. At least 200 hours
    4. At least 121.5 hours

  52. You re-test for your S endorsement 60 days before your five-year anniversary. What happens to the date?

    1. Your anniversary moves 60 days earlier
    2. You must re-test again within 90 days
    3. Your original anniversary date stays the same
    4. Your endorsement is cancelled for 60 days

  53. 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

  54. Which knowledge papers does a Class 2 applicant write?

    1. Class 1, Class 2 and Air Brake
    2. Sign, Basic, Class 2, Class 3 and Class 4
    3. Sign, Basic, Class 2 and School Bus
    4. Sign, Basic and Class 2 only

  55. Who may supervise a driver who holds a learner endorsement for a higher class?

    1. A driver who has held any commercial class for at least 90 days
    2. A driver who has held that class for 365 days in the last three years
    3. Any driver with a Class 5 licence held for one year
    4. Any certified instructor, even without that class

  56. For a sharp right turn with a bus, how far from the curb should you approach the intersection?

    1. About 1 to 1.5 m (3 to 5 ft.)
    2. Right against the curb
    3. In the centre of the left lane
    4. About 3 to 4 m (10 to 13 ft.)

  57. When lining up to couple, where should you first stop the tractor?

    1. With the fifth wheel locked under the kingpin
    2. Fifth wheel just ahead of the trailer, off the kingpin
    3. About ten metres away, so you can walk around and inspect the trailer
    4. With the drive wheels under the trailer apron

  58. 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

  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. 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

  61. 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%

  62. 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

  63. Why might badly adjusted brakes go unnoticed?

    1. They only fail in warm weather
    2. The low air warning hides them
    3. They make the pedal feel harder
    4. They seem fine under light braking

  64. 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

  65. 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

  66. 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

  67. 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

  68. 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

  69. 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

  70. Which matter must a school bus driver promptly report to the employer?

    1. Any change in the driver's home phone
    2. A minor dent found on a private car in the driveway
    3. A medical condition that could affect safe driving
    4. A parking ticket received on a personal vehicle

  71. 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

  72. 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

  73. If both the weight and the speed of a truck are doubled, how much more stopping power is needed?

    1. Eight times as much
    2. Sixteen times as much
    3. Four times as much
    4. Twice as much

Keep practising