Heavy Equipment Operator Certification Exam Prep · Question
An aggregate supplier advertises crushed rock with a swell factor of 10%. If a truck delivers 15 bank cubic metres (BCM) of this rock, what is the approximate volume in loose cubic metres (LCM) that the operator will observe in the truck box?
To convert Bank Cubic Metres (BCM) to Loose Cubic Metres (LCM) using the swell factor, the formula is: LCM = BCM × (1 + Swell Factor). Therefore, LCM = 15 BCM ×
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Question: An aggregate supplier advertises crushed rock with a swell factor of 10%. If a truck delivers 15 bank cubic metres (BCM) of this rock, what is the approximate volume in loose cubic metres (LCM) that the operator will observe in the truck box?
Answer options:
- 13.5 LCM
- 15.0 LCM ✅ 16.5 LCM
- 18.0 LCM
Correct answer: 16.5 LCM
Explanation: To convert Bank Cubic Metres (BCM) to Loose Cubic Metres (LCM) using the swell factor, the formula is: LCM = BCM × (1 + Swell Factor). Therefore, LCM = 15 BCM × (1 + 0.10) = 15 × 1.10 = 16.5 LCM. This accounts for the material expanding when excavated.
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