Crane Operator Certification Exam Prep · Question
A crane is planned to lift a 20-tonne load at a 15-meter radius. The manufacturer's load chart indicates that for this radius, a specific counterweight configuration (CW-A) gives a capacity of 25 tonnes, while a reduced counterweight configuration (CW-B) gives 18 tonnes. What is the safest and most efficient counterweight configuration to use for this lift?
Using CW-A provides a 25% safety margin above the 20-tonne load (25/20), whereas CW-B is insufficient as its capacity is less than the load to be lifted. Mainta
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Question: A crane is planned to lift a 20-tonne load at a 15-meter radius. The manufacturer's load chart indicates that for this radius, a specific counterweight configuration (CW-A) gives a capacity of 25 tonnes, while a reduced counterweight configuration (CW-B) gives 18 tonnes. What is the safest and most efficient counterweight configuration to use for this lift?
Answer options: ✅ CW-A, as it provides a higher safety margin.
- CW-B, as it is lighter and consumes less fuel.
- Neither, as both are within the crane's maximum capacity.
- Use a combination of CW-A and CW-B weights.
Correct answer: CW-A, as it provides a higher safety margin.
Explanation: Using CW-A provides a 25% safety margin above the 20-tonne load (25/20), whereas CW-B is insufficient as its capacity is less than the load to be lifted. Maintaining an adequate safety margin is paramount for stability.
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Question explanations
- According to most Canadian provincial regulations, who is ultimately responsible for the safe operation of a c
- A crane's rated capacity decreases as the load radius:
- What is the minimum number of full wraps of wire rope that must remain on a hoist drum when the hook is in its
- Before setting up a mobile crane, what is the most important factor to assess regarding ground conditions?
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