Saskatchewan Commercial: Tires, fire safety, fuel efficiency and winter driving

All 16 questions in this test

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

1. While driving you start to feel dizzy and drowsy. What could be the cause and what should you do?

   1. Low blood sugar; eat while you keep driving
   2. Tire noise; turn up the radio to stay alert
   3. Normal fatigue; open the window wider and keep on driving
   4. Possible carbon monoxide; stop and get fresh air

2. 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

3. 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

4. Beyond what angle does SGI say a jackknife is almost impossible to recover?

   1. About 90 degrees
   2. About 45 degrees
   3. About 15 degrees
   4. About 5 degrees

5. 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

6. Why use a winter-grade lubricant on a fifth wheel?

   1. Summer grease melts and drips onto the brakes
   2. Summer grease stiffens in cold and hinders steering
   3. Winter grease stops ice from forming around the kingpin
   4. Winter grease is required for the trailer ABS

7. 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

8. 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

9. 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

10. What is the maximum difference in diameter allowed between two tires in a set of duals?

    1. 25 mm (1 in.)
    2. 12.5 mm (1/2 in.)
    3. 6 mm (1/4 in.)
    4. 38 mm (1 1/2 in.)

11. 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

12. What should you use on a burning gasoline or oil fire?

    1. Water mixed with a little dish soap
    2. A wet blanket soaked in diesel fuel
    3. An extinguisher, sand or dirt to smother it
    4. A steady stream of water from a hose

13. 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

14. 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

15. 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.

16. 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