Advanced Mine Survey Certificate Exam Practice Questions - Advanced Certificate In Mine Survey (South Africa) Exam

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Heavy plumb bobs suspended in vertical shafts experience continuous pendulum oscillations due to air currents. Which method is standard practice in South African deep-level mines to dampen wire oscillations?

Immersing the plumb bob in a bucket of high-viscosity oil or water with dampening vanes Attaching high-powered neodymium magnets to the bottom of the shaft liner Increasing the tension beyond the yield strength of the steel piano wire Enclosing the entire wire inside a pressurized pneumatic conduit tube

Correct Answer:

Immersing the plumb bob in a bucket of high-viscosity oil or water with dampening vanes

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