SGI Class 1 License 4

Question 1

What is the purpose of the tractor protection valve on a Class 1 vehicle's air brake system?

Accepted Answer

It protects the tractor air supply if the trailer develops a major air leak

Answer

The tractor protection valve automatically closes to seal the tractor air supply if a major air leak occurs in the trailer, preserving tractor braking capability.

Question 2

Under SGI regulations, what is the minimum tread depth required for front steering axle tires on a commercial vehicle?

Accepted Answer

4 mm

Answer

Front steering axle tires must have a minimum tread depth of 4 mm to ensure adequate steering control and stopping ability.

Question 3

A Class 1 driver must complete a pre-trip inspection before driving. At minimum, how often must a post-trip inspection report be completed?

Accepted Answer

After every trip or at the end of each day's work

Answer

NSC Standard 13 requires drivers to complete a Driver Vehicle Inspection Report (DVIR) at the end of every trip or workday.

Question 4

When approaching a railway crossing with a Class 1 combination vehicle, what is the maximum speed you may cross at if no train is visible?

Accepted Answer

30 km/h

Answer

Commercial vehicles must slow to a maximum of 30 km/h when crossing railway tracks to maintain control over the crossing surface.

Question 5

What is the main reason a Class 1 driver should 'stab brake' rather than lock the brakes on a non-ABS equipped vehicle during an emergency stop?

Accepted Answer

Locking brakes causes the trailer to push the tractor sideways

Answer

Locking the brakes on a combination vehicle can cause the trailer to push the tractor in a jackknife; stab braking maintains steering control.

SGI - Saskatchewan Government Insurance Corporation Practice Test

SGI - Saskatchewan Government Insurance Corporation Practice Test

SGI Class 1 License 4