Question 59

The Correct Answer is B ### Why Option B is Correct **Option B) Two sets of twin cranes hoisting 120 tons** describes a tandem lift. A **tandem crane lift** (or dual crane lift) is defined as an operation where two (or more) separate, independent crane machines are required to simultaneously lift, support, and maneuver a single load. This requires extreme coordination between two sets of independent operators and ground crews. Option B implies the involvement of multiple, distinct crane systems working together (at least two independent systems, labeled here as "sets of twin cranes") to manage the single, heavy 120-ton load. This meets the essential definition of a tandem lift. *** ### Why Other Options Are Incorrect **A) Single crane hoisting 30 tons** This is a standard, single-crane operation. It involves only one crane machine, which explicitly excludes it from being a tandem lift. **C) Two cranes on a single pedestal hoisting 60 tons** This scenario typically describes a dual-hoist or twin-hook crane system. Although there are two hooks (or "cranes" referring to the boom/hoist mechanism), they are mounted on and controlled as a single piece of equipment by a single operator or control system. A tandem lift requires two separate, independent crane *machines* to be involved. **D) All of the above** Since options A and C do not meet the criteria for a tandem lift, D is incorrect.