The main purpose of a trial lift according to OSHA 1926.1417 is to _____.

a. go through the entire lift operation before risking passenger safety
b. verify the platform meets design load capacity specifications
c. make sure the platform is safe to lift personnel at a new work site
d. verify the crane’s load chart is accurate


a. go through the entire lift operation before risking passenger safety

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A sphere of ice, 5 cm in diameter, is exposed to 65 km/h wind with 15 percent relative humidity. Both the ice sphere and air are at ? 1°C and 90 kPa. Predict the rate of evaporation of the ice in g/h by use of the following correlation for single spheres: Sh = [4.0 + 1.21 (ReSc)2/3]0.5. Data at ? 1°C and 90 kPa: , kinematic viscosity (air) = 1.32 × 10?7 m2/s, vapor pressure (H2O) = 0.56 kPa and density (ice) = 915 kg/m3.

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Final drive ratio is being discussed. Technician A says a transmission gear ratio of 3.63 and a final drive axle ratio of 3.52, the overall gear ratio is 7.11. Technician B says the overall gear ratio is 12.78. Who is correct?

A. A only B. B only C. both A and B D. neither A nor B

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