Heavy Equipment Operator Certification Exam Prep · Question
A dozer pushes material 40 metres at an average speed of 5 km/h. The return trip is 8 km/h. If the dozer spends 30 seconds for blade load and dump cycle, what is its approximate total productive cycle time in minutes?
Push time: (40 m / 5000 m/hr) * 60 min/hr = 0.48 minutes. Return time: (40 m / 8000 m/hr) * 60 min/hr = 0.3 minutes. Fixed time (load/dump): 30 seconds = 0.5 mi
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Question: A dozer pushes material 40 metres at an average speed of 5 km/h. The return trip is 8 km/h. If the dozer spends 30 seconds for blade load and dump cycle, what is its approximate total productive cycle time in minutes?
Answer options:
- 1.5 minutes ✅ 1.25 minutes
- 1.75 minutes
- 2 minutes
Correct answer: 1.25 minutes
Explanation: Push time: (40 m / 5000 m/hr) * 60 min/hr = 0.48 minutes. Return time: (40 m / 8000 m/hr) * 60 min/hr = 0.3 minutes. Fixed time (load/dump): 30 seconds = 0.5 minutes. Total cycle time = 0.48 + 0.3 + 0.5 = 1.28 minutes. Closest option is 1.25 minutes. (Reference: IUOE 793 Training Standards, Cycle Time Analysis).
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