Ontario Class D Practice Test · Question
What is the primary purpose of using engine braking when descending a long, steep grade in a straight truck?
Engine braking helps control vehicle speed on downhill grades, reducing the reliance on the service brakes and preventing them from overheating and failing due
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Question: What is the primary purpose of using engine braking when descending a long, steep grade in a straight truck?
Answer options:
- To increase fuel efficiency ✅ To maintain speed without using the service brakes excessively
- To reduce engine wear
- To prevent the transmission from overheating
Correct answer: To maintain speed without using the service brakes excessively
Explanation: Engine braking helps control vehicle speed on downhill grades, reducing the reliance on the service brakes and preventing them from overheating and failing due to continuous application.
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Question explanations
- When performing a pre-trip inspection, what is the minimum air pressure required in an air brake system before
- When driving a straight truck, how should you pass a pedestrian walking on the shoulder of the road without a
- Scenario 1: Tare weight refers to:
- Scenario 2: Gross combination weight (GCW) is:
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