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Exam 18: Management of Waiting Lines

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Question 31

True/False

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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.

A) True
B) False

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Question 32

Multiple Choice

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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. What is the probability that a machine will have to wait for service with two operators?

A) .654
B) .090
C) .346
D) .910
E) .016

F) A) and D)
G) A) and C)

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Question 33

Multiple Choice

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Which of the following is not generally considered to be a measure of system performance in a queuing analysis?

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

A multiple-server system has all the following assumptions except.

A restaurant that implements a limited menu and a "no substitutions" policy during peak dining hours is practicing _____________ with respect to waiting-line management.

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

Which of the following would reduce perceived waiting times most dramatically in a doctor's office?

The goal of waiting-line management is to minimize

________________ is a mathematical approach to analyzing waiting lines.

Queue discipline requires a security presence to maintain order.

In which of these settings would one be least likely to encounter first-come service?

A single-phase queuing system in which each arriving customer will be served by a three-member crew has four crews with three members each. The number of "servers" is

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

A restaurant at a popular Colorado casino provides priority service to player's card holders. The restaurant has 10 tables or booths where customers may be seated. The service time (time a booth or table is occupied) averages 42 minutes once a party is seated. The customer arrival rate is 8 parties per hour, with the parties being equally divided between card holders and people without player's cards. On average, how much longer do parties without player's cards spend in the system, compared to parties with the player's cards?

A ________ is one way of reducing perceived waiting time.

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

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. What is the average machine downtime with two operators?

If a manager increases system utilization (assuming no change in the customer arrival rate) what happens to the customer waiting time?

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