Chp 11 _Waiting Line Model

The body of knowledge dealing with waiting lines is known as queueing theory.

• True

• False

Decision makers in queuing situations attempt to balance

• operating characteristics against the arrival rate.

• service levels against service cost.

• the number of units in the system against the time in the system.

• the service rate against the arrival rate.

Performance measures dealing with the number of units in line and the time spent waiting are called

• queuing facts.

• performance queues.

• system measures.

• operating characteristics.

The manner in which units receive their service, such as FCFS, is the

• queue discipline.

• server.

• steady state.

• operating characteristic.

In a waiting line situation, arrivals occur, on average, every 10 minutes, and 10 units can be received every hour. Which of the following represents λ and μ in this situation?

• λ = 10, μ = 10

• λ = 6, μ = 6

• λ = 6, μ = 10

• λ = 10, μ = 6

The mean number of units that can be served per time period is called

• the service rate and is denoted by λ.

• the service rate and is denoted by μ.

• the steady state.

For many waiting line situations, the arrivals occur randomly and independently of other arrivals and it has been found that a good description of the arrival pattern is provided by a(n)

• normal probability distribution.

• exponential probability distribution.

• uniform probability distribution.

• Poisson probability distribution.

Single-booth ticket sales at a theater are an example of which of the following queuing models?

• single-server, Poisson service rate distribution, unlimited queue length

• single-server, Poisson service rate distribution, limited queue length

• single-server, constant service rate distribution, unlimited queue length

• single-server, normal service rate distribution, unlimited queue length

The equations provided in the textbook for computing operating characteristics apply to a waiting line operating

• at start-up.

• at steady state.

• at peak demand times.

• in transition

Adding more servers always improves the operating characteristics of the waiting line and reduces the waiting cost.

• True

• False