BC Class 4 Practice Test · Question
What does a continuous cloud of white smoke from the exhaust pipe usually indicate?
White smoke often indicates coolant leaking into the engine, while black smoke indicates too much fuel (running rich). Any unusual smoke should be investigated.
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Question: What does a continuous cloud of white smoke from the exhaust pipe usually indicate?
Answer options: ✅ Coolant leaking into the combustion chamber
- The engine is running at the correct temperature
- The air filter is perfectly clean
- The brakes are overheating
Correct answer: Coolant leaking into the combustion chamber
Explanation: White smoke often indicates coolant leaking into the engine, while black smoke indicates too much fuel (running rich). Any unusual smoke should be investigated.
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Question explanations
- What should you do if your accelerator pedal sticks while you are driving?
- What type of information should a Class 4 driver generally NOT include in their daily trip records or logbook
- When operating a taxi or small bus, when are you required to ensure passengers are using seatbelts?
- What is the correct procedure for a small bus driver approaching an uncontrolled railway crossing?
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