The failure data analysis of a longwall mining system consisting of...

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The failure data analysis of a longwall mining system consisting of thre major subsystems revealed that the failure rate of shearer, face conveyor any stage loader are 0.15/ hour, 0.2/ hour and 0.1/ hour respectively. If all the subsystems must be running for a satisfactory system operation, the reliability of the longwall system for a period of 4 hours is

A. 0.165

B. 0.259

C. 0.405

D. 0.63

Answer: Option A

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