Class 3 Commercial Driver Practice · Question
A retarder on a heavy truck is used to:
Retarders (engine, exhaust, transmission or driveline) provide additional braking, sparing the service brakes.
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Question: 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.
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- 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:
- Scenario 3: A retarder on a heavy truck is used to:
- Scenario 4: An e-log (ELD) records:
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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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