Comparative analysis of two unit cold standby system with three types of repair policy and replacement to a model with instruction and two out of these three types policy

The present paper deals with comparative analysis of two unit cold standby system with three types of repair policy and replacement with a model having instruction and two of the three types of repair policy. In the first model damage unit sometimes may or may not be repairable and therefore, it is repaired or replaced. The two types of repair policy used are: resume repair policy and policy adopted at the more degraded stage due to damage made by the ordinary repairman during try for repair. The purpose of taking the idea of instruction in the paper is to avoid the possibility of incorrect process of repair done by the ordinary repairman. It has been assumed that the expert repairman when comes for repairing a failed unit repairs all the unit which fail during his stay at the system.