某设备近期的运行状况如下表，则该设备的平均修复时间为（ ）小时。
- A.3
- B.4
- C.120
- D.124
正确答案及解析
正确答案
解析
平均无故障时间（MTBF）：与可靠性相关；平均无故障时间＝系统运行时间/系统在运行时间的故障次数；平均无故障时间越长，系统的可靠性越高。
平均故障修复时间（MTTR）：与可恢复性和可服务性相关；平均故障修复时间＝系统故障耗时/故障次数；平均故障修复时间越短，表示恢复性越好。
平均故障间隔时间（MTBSI）：等于MTBF＋MTTR；平均故障间隔越长，表示可靠性越高。
本题中，MTTR＝（3＋6＋3）/3＝4小时。
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