choose the correct gantt chart with the minimum makespan schedule. the correct graph is select- a. mill time…

choose the correct gantt chart with the minimum makespan schedule. the correct graph is select- a. mill time 0 4 9 17 26 36 50 job 216 519 327 258 462 617 drill time 0 4 11 17 27 42 45 62 job 216 519 327 258 462 617 b. mill time 0 10 24 33 41 46 50 job 462 617 258 327 519 216 drill time 0 10 13 36 51 61 67 job 462 617 258 327 519 216 c. mill time 0 4 9 17 26 40 50 job 216 519 327 258 617 462 drill time 0 4 11 17 27 42 54 57 job 216 519 327 258 617 462 d. mill time 0 4 12 22 27 36 50 job 216 327 462 519 258 617 drill time 0 4 11 22 25 33 51 63 job 216 327 462 519 258 617

choose the correct gantt chart with the minimum makespan schedule. the correct graph is select- a. mill time 0 4 9 17 26 36 50 job 216 519 327 258 462 617 drill time 0 4 11 17 27 42 45 62 job 216 519 327 258 462 617 b. mill time 0 10 24 33 41 46 50 job 462 617 258 327 519 216 drill time 0 10 13 36 51 61 67 job 462 617 258 327 519 216 c. mill time 0 4 9 17 26 40 50 job 216 519 327 258 617 462 drill time 0 4 11 17 27 42 54 57 job 216 519 327 258 617 462 d. mill time 0 4 12 22 27 36 50 job 216 327 462 519 258 617 drill time 0 4 11 22 25 33 51 63 job 216 327 462 519 258 617

Answer

Explanation:

Step1: Identify makespan for each option

The makespan is the total time taken to complete all jobs. For option A, for the MILL operation, the jobs end at time 50 and for the DRILL operation at time 62. So the makespan is 62. For option B, for MILL it's 50 and for DRILL it's 67, so makespan is 67. For option C, for MILL it's 50 and for DRILL it's 57, so makespan is 57. For option D, for MILL it's 50 and for DRILL it's 63, so makespan is 63.

Step2: Compare makespans

We compare the makespans 62, 67, 57 and 63. The minimum value among them is 57.

Answer:

C.