Quiz 4

In an M/M/1 queuing system, customers arrive at a rate of 2 per hour and are served at a rate of 3 per hour. What is the probability that there will be 2 customers in the system? (When giving your answer, round off to three decimal places).

0.148

In an M/M/1 queuing system, customers arrive at a rate of 4 per hour and are served at a rate of 6 per hours. What is the probability that a customer will have to wait? (When giving your answer, round off to two decimal places).

0.67

What is the efficiency of a line that has five workstations, a cycle time of twenty minutes, and task times totalling 90 minutes.

0.9

Which of the following are important factors in facility location decisions?

A. Type and number of facilities B. Geo-political factors

Which of the following is NOT a factor generally affecting the location of heavy manufacturing facilities?

A. proximity to raw materials and shipment modes B. all the above C. land costs D. Utilities E. construction costs

A mixed model assembly line is a type of hybrid layout that

Attempts to maintain efficiency while also increasing flexibility

Which of the following is NOT a typical performance measure for queuing systems?

Average maximum number of customers in the system

Which of the following departments is not directly affected by the facilities decision?

D. None of the above Answers: A. Operations B. Marketing C. Finance

Which of the following statements is true about facilities decisions?

Facilities decisions involves all organizational units and are often made at the highest corporate level.

A "manufacturing cell" is not one of the "Hybrid" forms of layout discussed in class.

False

A process-oriented layout is generally not used in a job-shop environment

False

Generally speaking, you can use the same queuing model whether the size of the calling population is infinite or limited.

False

Locational break-even analysis seeks to minimize the total load distance costs

False

Specific objectives of facility layout are not necessary, as long as the general and strategic objectives are well defined.

False

When a queuing model finds a steady state solution, it means that model has found an optimal solution.

False

When developing a facility layout, quality of work life issues are relatively unimportant

False

Which of the following is NOT an important arrival characteristic that should be considered when selecting a queuing model?

How many servers are there in the system

Which of the following is NOT an "other" type of layout?

Mixed model assemble line

The first M in M/M/1 queing model notation indicates

Poisson distribution if arrival data are measured as # of arrivals per time period

Which of the following is NOT a factor complicating a fixed position layout?

Sequential arrangement of work

Which of the following is not a "component" of a queuing system

Served customers

A modern (TQM-based) approach to managing costs in a queuing system advocates improving the system to reduce costs of service and waiting simultaneously instead of trading off costs of service and waiting.

True

A product-oriented layout is often used in mass production situations

True

Block diagramming attempts to find a layout with a very low total cost of moving all loads between departments

True

Facility location is important because up to 10% of total costs for industrial firms are directly attributable to location decisions.

True

For facility location decisions, the factor rating method is the most broadly applicable of the methods we discussed in class

True

In the location of competitive retail facilities, proximity to customers is often more important than construction costs (on a relative basis) because the revenue function dominates the cost function.

True

Many, but not all queuing models assume that the arrival rate distribution is approximately comparable to a Poisson statistical distribution.

True

Mixed model assembly lines seek to retain the efficiency of a production line, while increasing the flexibility of product mix.

True

Obtaining accurate and useful estimates of a queuing system's Operating Characteristics requires selection of a precise queuing model.

True

One advantage of a cellular layout, relative to a FMS layout, is that you may get comparable amounts of flexibility and efficiency, without a large capital investment.

True

Process-oriented layouts often have large amounts of storage space for work in process inventory

True

The transportation method was the only facility location model/method we discussed in class that allowed us to consider multiple site locations simultaneously.

True

There are very few generally applicable rules for developing a fixed position layout; however, scheduling of people, materials, finances and technology are important for managing virtually all fixed position layouts.

True

Which of the following is NOT an example of a question asked in a facilities decision?

Where should the capacity be located?

Which of the following is not a factor impacting the elements of a facilities strategy?

size of units