Management Of Waiting Lines

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Question 1

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Waiting lines occur even in underloaded systems because of variability in service rates and/or arrival rates.

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Question 2

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A system has one service facility that can service 10 customers per hour. The customers arrive at a variable rate, which averages six per hour. Since there is excess capacity, no waiting lines will form.

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Question 3

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The goal of waiting-line management is to eliminate customer waiting lines.

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Question 4

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The cost of customer waiting is easy to estimate, the number waiting multiplied by the wait cost per minute.

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Question 5

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In a theme park like Disney world, reservation systems are a win-lose situation since only those holding reservations are satisfied.

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Question 6

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The point that minimizes total queuing system costs is that point where waiting costs and capacity costs are equal.

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Question 7

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A multiple-channel system assumes that each server will have its own waiting line, and line changing is not permitted.

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Question 8

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A dental office with two professionals (one dentist, one hygienist) who work together as a team would be an example of a multiple-channel system.

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Question 9

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A single-server, variable-service-time system is known as an M/D/1 system.

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Question 10

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The most commonly used queuing models assume that the arrival rate can be described by a Poisson distribution.

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Question 11

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The goal of queuing analysis is to balance the cost of providing a level of service capacity with the possible loss of business due to customers leaving the line or refusing to wait.

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Question 12

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According to Little's law, the number of people in line depends on the time of day that they arrive.

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Question 13

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For a system that has a low utilization ratio, decreasing service capacity slightly will have only negligible effect on customer waiting time.

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Question 14

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An approach to reducing the variability in processing times might include greater standardization.

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Question 15

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The queuing models discussed in the text apply only to steady-state conditions. Steady state exists only when customers arrive at a steady rate; that is, without any variability.

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Question 16

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In an infinite-source model, the average number being served is equal to the ratio of the arrival rate to the service rate.

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Question 17

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In an infinite-source model, the average time in line is equal to the average number in line divided by the arrival rate.

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Question 18

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In an infinite-source model, the system utilization is the ratio of the arrival rate to the service capacity.

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Question 19

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To reduce the average number waiting in line, it is important to increase utilization.

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Question 20

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Queue discipline requires a security presence to maintain order.

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