Which of the following statements about the use of turnbuckles is correct?
a. Hook-and-hook turnbuckles are preferred over eye-and-eye turnbuckles for rigging.
b. Turnbuckles are used to adjust the length of rigging connections.
c. Turnbuckles are best tightened with a pipe wrench at least 24" (61 cm) in length.
d. When using multi-legged slings or hitches, two turnbuckles should be used on each leg.
b. Turnbuckles are used to adjust the length of rigging connections.
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Which of the following statements regarding on-rubber crane operations is true?
a. The operator can rely on a 25 percent capacity buffer for loads slightly heavier than the load-chart capacity. b. Lowering tire pressure will increase crane stability by lowering the crane’s CG. c. On-rubber operations allow more capacity than on-outriggers. d. The on-rubber load chart capacities reflect 75 percent of tested tipping capacity.
You need to find the vapor pressure of ethyl benzene at a temperature 20 degrees Celsius above its normal boiling point (the normal boiling point is 136 C). You will do this two ways:
a) Use the physical property data available in the Appendix C to help provide this estimate. (b) Use the Antoine equation constants available in Appendix E to provide this estimate.
Motors are the most important loads in any heating, cooling, or refrigeration system.
Answer the following statement true (T) or false (F)
Technician A says that a fuel tank is either constructed of steel with brass plating for corrosion resistance or of polyethylene plastic. Technician B says that some fuel tank filler tubes contain an anti-siphoning device. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician