Bachelor of Science in Industrial Engineering MCQ Flashcards

In a single-server queuing system (M/M/1), what happens to the average waiting time as the traffic intensity (ρ) approaches 1?

Answer: It approaches infinity

As ρ → 1, the queue length and waiting time grow without bound, making the system unstable.

Which ergonomic principle states that workstations should be designed to fit the 5th to 95th percentile of the user population?

Answer: Design for adjustability

Designing for adjustability accommodates the broadest range of users by allowing the workstation to be modified to fit individual needs.

In Six Sigma methodology, a process operating at 6 sigma quality level produces approximately how many defects per million opportunities (DPMO)?

Answer: 3.4

A Six Sigma process, with a 1.5 sigma shift, yields approximately 3.4 DPMO.

The Wagner-Whitin algorithm is used to solve which type of inventory problem?

Answer: Dynamic lot sizing with time-varying demand

The Wagner-Whitin algorithm finds the optimal lot-sizing policy when demand varies across planning periods.

Which simulation technique is most appropriate for modeling systems where state changes occur at discrete points in time?

Answer: Discrete-event simulation

Discrete-event simulation tracks system state changes that occur at specific event times, making it ideal for queuing and manufacturing systems.

In the context of facilities layout, the Systematic Layout Planning (SLP) method uses a relationship chart that rates the closeness desirability between departments using letters. Which letter represents 'absolutely necessary' closeness?

Answer: A

In SLP's AEIOUX scale, 'A' stands for 'Absolutely necessary,' the highest closeness rating.

A reliability block diagram has two components in parallel, each with reliability R. What is the system reliability?

Answer: 2R - R²

For two parallel components, system reliability = 1 - (1-R)(1-R) = 2R - R².