Question

Problem 2 A shop has fifty (50) machines which are repaired in the same order in which they fail. A machine fails on average of 0.0250 machine per hour and each repair crew can repair 0.2778 machine per hour. The maintenance policy is to repair the broke down machine and bring back in production within 4 hours. 1. How many repair crews are required? Section 2 (Short Essay): If you think that First In-First Out (FIFO) is not a good tool to define priorities in scheduled maintenance what tool you will choose and how it work?

Answer 1

n = 50

machine fails 0.0250 per hour

repairs are done 0.2778 machine per hour

Machine is repaired and brought back in 4 hours

Number of repair crews = Repair rate / no.of machines repaired per hour

Repair rate = 0.025 + 1/4 = 0.275 machines / hour

Number of repair crews = 0.275 / 0.2778 = 0.9899 = 1

Only one member is required for the given situation.

Please post the other question separately as we can't answer more than one question per post. Thanks for understanding.