For an emergency operation theatre in a hospital, the power is obtained from the main city supply through a transformer connected in series. To ensure an uninterrupted supply, an auxiliary generator is also used with a suitable switch- over. The probability of failure of the city supply is 0.02 and the transformer reliability is 0.969 the auxiliary power generator has a reliability factor of 0.989 draw the block diagram for the system. Construct the fault tree and, based on this, calculate the reliability of the system. A Main fails B F (S) Transformer fails Generator fails