Ontario Class D Practice Test · Question
Scenario 3: A retarder on a heavy truck is used to:
Retarders (engine, exhaust, transmission or driveline) provide additional braking, sparing the service brakes. The correct answer is "Help slow the vehicle with
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Question: Scenario 3: A retarder on a heavy truck is used to:
Answer options:
- Increase engine power ✅ Help slow the vehicle without using service brakes
- Heat the cab
- Improve fuel economy at high speed
Correct answer: Help slow the vehicle without using service brakes
Explanation: Retarders (engine, exhaust, transmission or driveline) provide additional braking, sparing the service brakes. The correct answer is "Help slow the vehicle without using service brakes". This capacity-fill scenario 3 reinforces the same competency for the class3 bank and follows the certified explanation standard.
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- 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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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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