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Tower crane brakes must apply when there is a power loss. These are called:
fail safe brakes T or F Tower and mobile cranes are both load tested at 125% overload false Tower crane operator controls should automatically return to what position when pressure is released?neutral
Every tower crane cab MUST be equipped with a:
load rating chart T or F Because of their light weight, it is not necessary to include slings and rigging hardware in the pre-lift load weight calculations false T or F A tower crane can be safely operated in wind speeds exceeding 20-30 mph if the load doesn't approach the crane capacity false T or F If so equipped, the digital computerized operator aid system can be used as a scale to test weight of the load false 1 / 2
What is used to adjust the jib for proper inclination and eliminate jib twist turnbuckles A tower crane fastened to the outside of a building should be secured a minimum of
- flours
- / 2
What is the purpose of a jib radius marker?indicate position of trolley on the jib T or F A limit switch is a device that restricts movements of the crane and prevents overloading or damage true T or F Each crane only requires only one limit switch. That switch will be on the trolley hoist false T or F All limit switches are of a mechanical type, including those on digital control cranes false T or F The person giving signals must always be in a position to see the load clearly at all times true The preferred method of contact between signal person and operator is by hard wire voice communicaton
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