Ontario Class A Practice Test · Question
Scenario 149: A 'jackknife' occurs when:
Drive-wheel lock-up or skid causes the trailer to swing around and form an angle with the tractor. The correct answer is "The tractor and trailer fold at the fi
Start free practice for Ontario Class A Practice Test
50 questions · no signup required · 40 free questions per day
Question: Scenario 149: A 'jackknife' occurs when:
Answer options: ✅ The tractor and trailer fold at the fifth wheel due to drive-wheel skid
- Tires lose air pressure suddenly
- The trailer load shifts forward
- The kingpin breaks
Correct answer: The tractor and trailer fold at the fifth wheel due to drive-wheel skid
Explanation: Drive-wheel lock-up or skid causes the trailer to swing around and form an angle with the tractor. The correct answer is "The tractor and trailer fold at the fifth wheel due to drive-wheel skid". This capacity-fill scenario 149 reinforces the same competency for the class1 bank and follows the certified explanation standard.
Start free practice for Ontario Class A Practice Test
50 questions · no signup required · 40 free questions per day
More about Ontario Class A Practice Test
Related Questions
- Approaching a sign that reads 'Runaway Lane / Emergency Escape Ramp Ahead', what is the immediate significance
- A rectangular sign with a truck symbol and an upward-pointing arrow, followed by 'Steep Grade', combined with
- What is the correct interpretation of a 'Oversize Load' sign displayed on a pilot vehicle in front of a flatbe
- A commercial vehicle displaying a red flag at the rear of its load indicates:
- You see a rectangular yellow sign with 'LONG VEHICLE' written in black letters. What information does this con
- A sign on the side of a transport truck reads ‘WIDE LOAD’. Which of the following is most probable about the v
More for Ontario Class A Practice Test candidates
Practice tests
Question explanations
- Approaching a sign that reads 'Runaway Lane / Emergency Escape Ramp Ahead', what is the immediate significance
- A rectangular sign with a truck symbol and an upward-pointing arrow, followed by 'Steep Grade', combined with
- What is the correct interpretation of a 'Oversize Load' sign displayed on a pilot vehicle in front of a flatbe
- A commercial vehicle displaying a red flag at the rear of its load indicates:
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Ontario Class A Practice Test Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.