Five jobs are waiting for processing through two work centres. Their processing time (in minutes) at each work centre is contained in the table below. Each job requires work centre Alpha before work centre Beta. According to Johnson's rule, which job should be scheduled first in the sequence? $$\begin{array} { | c | c | c | }
\hline \text { Job } & \text { Alpha } & \text { Beta } \
\hline R & 20 & 10 \
\hline \mathrm { S } & 25 & 35 \
\hline \mathrm { T } & 50 & 20 \
\hline \mathrm { U } & 15 & 35 \
\hline \mathrm { V } & 55 & 75 \
\hline
\end{array}$$
A) R
B) S
C) T
D) U
E) V

Question

Five jobs are waiting for processing through two work centres. Their processing time (in minutes) at each work centre is contained in the table below. Each job requires work centre Alpha before work centre Beta. According to Johnson's rule, which job should be scheduled first in the sequence? $$\begin{array} { | c | c | c | } 
\hline \text { Job } & \text { Alpha } & \text { Beta } \
\hline R & 20 & 10 \
\hline \mathrm { S } & 25 & 35 \
\hline \mathrm { T } & 50 & 20 \
\hline \mathrm { U } & 15 & 35 \
\hline \mathrm { V } & 55 & 75 \
\hline
\end{array}$$
A) R
B) S
C) T
D) U
E) V

Quizplus · Accepted Answer

Johnson's rule for scheduling jobs through two work centers involves selecting the job with the shortest processing time at either work center and scheduling it either as early as possible if that time is in the first work center (Alpha) or as late as possible if that time is in the second work center (Beta). In this case, Job U has the shortest processing time in the first work center (Alpha) with 15 minutes, so it should be scheduled first.

Five Jobs Are Waiting for Processing Through Two Work Centres