Five Jobs Are Waiting for Processing Through Two Work Centres

question 19

Multiple Choice

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, what is the optimum sequence of jobs and the minimum time for completion of all jobs? $$\begin{array} { | c | c | c | } \hline \text { Job } & \text { Alpha } & \text { Beta } \\\hline R & 20 & 10 \\\hline \mathrm { S } & 25 & 35 \\\hline \mathrm { T } & 50 & 20 \\\hline \mathrm { U } & 15 & 35 \\\hline \mathrm { V } & 55 & 75 \\\hline\end{array}$$

• A) V-T-S-U-R; 225
• B) U-R-T-S-V; 175
• C) R-S-T-U-V; 240
• D) U-S-V-T-R; 200
• E) V-U-T-S-R; 250

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Definitions:

DSA

Digital Subtraction Angiography, a type of fluoroscopy technique used in radiology to visualize blood vessels by subtracting a pre-contrast image from subsequent images, after the contrast material has been injected.

Metabolism

The biochemical processes that occur within a living organism to maintain life, including the conversion of food to energy, the construction of proteins and nucleic acids, and the elimination of waste products.

Organization

In a biological context, it refers to the structured and regulated arrangement of living organisms, from cellular components to complex body systems.

Maturation

The process of becoming mature, involving growth and development that occurs in an organism over time.