Question

explain the answers pls

What is the most common cause of crane accidents?

A. Load dropped B. Energized power lines C. Overturning D. Boom collapsed

The machine performance depends on the following powers: (Check all that apply)

A. Required power B. Rimpull C. Drawbar pull D. Useable power

Answer 1

solution is posted below.

hope it helps.

as per osha's analysis the main cause of crane failure and accident are due to contact of boom and crane with energized line. which stands nearly 45 percent of total. hence option  b is the answer.

performance of machine is analysed on the basis of performance chart which are made individually for a machine.

performance chart is the graphical representation of power versus corresponding speed  the engine can deliver.

load condition for making performance chart are either rimpull or drawbar pull.

hence option B and C are correct options.