For the equipments using Integrated Circuit Board: 400, Capacitors: 240 and Printed Circuits boards: 120 to run with minimum downtime, how many spares should be kept in the store respectively?

Solution

The failure rate of Integrated Circuit Board per 1000 is 30. Hence for 400, the failure will be (30*400)/1000=12

The failure rate of Capacitors per 1000 is 20. Hence for 240, the failure will be (20*240)/1000= 5 (Approximately)

The failure rate of Printed Circuit Board per 1000 is 33. Hence for 120, the failure will be (33*120)/1000= 4 (Approximately)

Hence 12,5,4 is the answer.

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