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Exam 24: Management of Waiting Lines

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Question 21

Multiple Choice

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Offering an "early bird" special at a restaurant to reduce waiting times during peak hours is an example of:

A) demand shifting.
B) queuing psychology.
C) service phasing.
D) service standardization.
E) outsourcing.

F) B) and C)
G) C) and D)

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Question 22

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A bank of 10 machines requires regular periodic service. Machine running time and service time are both exponential. Machines run for an average of 44 minutes between service requirements, and service time averages six minutes per machine. If operators cost $15 per hour in wages and fringe benefits and machine downtime costs $75 per hour in lost production, what is the optimal number of operators for this bank of machines?

A) 1
B) 2
C) 3
D) 4
E) 5

F) D) and E)
G) None of the above

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Question 23

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In a multichannel system with multiple waiting lines, customers shifting among the waiting lines is an example of:

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

Which one of the following measures of system performance is a key measure with respect to customer satisfaction?

Why is there waiting in an infinite-source queuing system?

A customer growing frustrated with the wait and leaving the facility (without being served) is an example of:

A single-bay car wash with a Poisson arrival rate and an exponential service time has cars arriving an average of 10 minutes apart, and an average service time of four minutes. The system utilization is:

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

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.

Compared to a single-channel system with exponential service time, a single-channel system with a constant service time causes a reduction of 50 percent in the average number waiting in line.

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.

As the ratio of arrival rate to service rate is increased, which of the following is likely?

The goal of waiting-line management is to minimize:

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

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

In a _______ system, customers enter the waiting line, receive service, and leave.

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

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

A multiple-channel queuing system with a Poisson arrival rate and exponential service time has an average arrival rate of four customers per hour and an average service time of 18 minutes per customer. The minimum number of servers required to avoid an overloaded system is: