a) What will be the job sequences using (1) CR and (2) SPT rules? b) What will be the (1) average flow time, (2) average days late, and 3) average work in progress for the CR and SPT sequences? c) Apply the appropriate method to determine the sequence which will minimize the total number of late jobs.

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The maintenance department of an Oil and Gas Company has 6 large drilling equipment waiting for repairs. These are labelled A, B, C, D, E and F. The respective repair times (in days) and the remaining days before the due date are given in the table below.

 

Problem 1: The maintenance department of an Oil and Gas Company has 6 large drilling equipment
waiting for repairs. These are labelled A, B, C, D, E and F. The respective repair times (in days) and the
remaining days before the due date are given in the table below.
Equipment Time required
Due (at the end of) day
A
1
30
В
8.
27
C
38
D
27
57
E
2
29
F
29
42
a) What will be the job sequences using (1) CR and (2) SPT rules?
b) What will be the (1) average flow time, (2) average days late, and 3) average work in progress
for the CR and SPT sequences?
c) Apply the appropriate method to determine the sequence which will minimize the total
number of late jobs.
Transcribed Image Text:Problem 1: The maintenance department of an Oil and Gas Company has 6 large drilling equipment waiting for repairs. These are labelled A, B, C, D, E and F. The respective repair times (in days) and the remaining days before the due date are given in the table below. Equipment Time required Due (at the end of) day A 1 30 В 8. 27 C 38 D 27 57 E 2 29 F 29 42 a) What will be the job sequences using (1) CR and (2) SPT rules? b) What will be the (1) average flow time, (2) average days late, and 3) average work in progress for the CR and SPT sequences? c) Apply the appropriate method to determine the sequence which will minimize the total number of late jobs.
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