MEM Operations Management 3

Question 1

A hospital emergency department has an average arrival rate of 10 patients/hour and an average service rate of 12 patients/hour. Using M/M/1 queuing, what is the average time a patient spends in the system?

Accepted Answer

30 minutes

Answer

W = 1/(μ−λ) = 1/(12−10) = 0.5 hours = 30 minutes.

Question 2

Which supply chain risk mitigation strategy involves holding excess inventory at strategic locations to buffer against supply disruptions?

Accepted Answer

Forward stocking

Answer

Forward stocking places buffer inventory closer to demand points to absorb upstream supply disruptions quickly.

Question 3

An operation has a cycle time of 4 minutes per unit and a shift of 480 minutes with 60 minutes of planned downtime. What is the takt time if customer demand is 100 units per shift?

Accepted Answer

4.2 minutes

Answer

Available time = 480 − 60 = 420 minutes; takt time = 420 / 100 = 4.2 minutes per unit.

Question 4

In the DMAIC framework used in Six Sigma projects, the 'Analyze' phase primarily focuses on which activity?

Accepted Answer

Identifying root causes of defects

Answer

The Analyze phase uses statistical tools to identify and verify the root causes driving process variation and defects.

Question 5

A manufacturer selects suppliers using a weighted-score model. Supplier A scores 80 on quality (weight 0.5), 70 on delivery (weight 0.3), and 90 on cost (weight 0.2). What is the total weighted score?

Accepted Answer

79

Answer

Score = (80×0.5) + (70×0.3) + (90×0.2) = 40 + 21 + 18 = 79.

MEM - Master of Engineering Management Practice Test

MEM - Master of Engineering Management Practice Test

MEM Operations Management 3