A machine repeats a complete working cycle periodically that lasts for t = 40 mi

Question

A machine repeats a complete working cycle periodically that lasts for t = 40 min. During the working period the input power is Pinput,1 = 8 [kWJ and the efficiency is n1, = 79%. Between two working periods, while the work piece is replaced, the machine runs idle with a power consumption of Pinput,2 = 1.3 [kWJ. Find the time available for the replacement of the work piece if a minimum of n average = 75% average efficiency must be kept and the average load factor if the time of the replacement reduces to t=8 min.

Explanation / Answer

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