SGI SGI Heavy Commercial Vehicle Operations 2

Question 1

What is 'jackknifing' in a tractor-trailer combination?

Accepted Answer

The trailer swings out at an angle relative to the tractor during braking

Answer

Jackknifing occurs when excessive braking causes the trailer to swing outward, folding the combination like a closing jackknife.

Question 2

What is the correct way to back a tractor-trailer to the left?

Accepted Answer

Turn the steering wheel to the right to move the trailer to the left

Answer

To back a trailer to the left, the driver turns the steering wheel to the right, which pushes the rear of the trailer to the left.

Question 3

What is the 'off-tracking' phenomenon in large vehicles?

Accepted Answer

Rear wheels follow a shorter path than front wheels around curves

Answer

Off-tracking means the rear axles of a large vehicle track inside the path of the front wheels, requiring drivers to swing wider on turns to avoid hitting curbs.

Question 4

What is the minimum depth allowed for tire tread on a commercial vehicle's front steering axle?

Accepted Answer

4.8 mm (6/32 inch)

Answer

Front steering axle tires require a minimum of 4.8 mm (6/32 inch) of tread depth due to their critical role in vehicle control.

Question 5

What should a commercial driver do when a tire blows out on a rear axle?

Accepted Answer

Hold the wheel firmly, gradually ease off the throttle, and steer straight to a safe stop

Answer

Holding the wheel firmly and gradually slowing down maintains control, as sudden braking can cause the vehicle to swerve or jackknife.

SGI - Saskatchewan Government Insurance Corporation Practice Test

SGI - Saskatchewan Government Insurance Corporation Practice Test

SGI SGI Heavy Commercial Vehicle Operations 2