Know the objective of maintenance and reliability

to maintain the capability of the system

Know the definition of reliability

the probability that a machine part or product will function properly for a specified time under stated conditions

Know different reliability tactics

Improving individual components, providing redundancy

Know what the MTBF measures

Operating time between failures

Know the different applications of linear programming

Product mix problem,

Which of the following is NOT a requirement of a linear programming problem

for each decision variable there must be one constraint or resource limit

We will write a custom essay sample on

Any topic specifically for you

For only $13.90/page

Order Now
Know how a constraint would be written in linear programming

2X + 7Y ≥ 100

Know what an objective function is

a mathematical expression in linear programming that maximizes or minimizes some quantity (often profit or cost)

Know what “feasible solution space” means

The region which satisfies all of the constraints in graphical linear programming

Know what the “corner point solution” requires

finding the coordinates (profit) at each corner of the feasible solution space

Study of waiting-line models helps operations managers better understand

All of the above…Service systems (bank teller, amusement park rides), repair broken machinery, shop-floor control activities

Ls

average # units in system

Ws

total time in system

q

time in the queu (waiting to be served)

Lq

average # units waiting to be served

Wq

average time a unit spends waiting in the queue; longer than Lq

Know what “poisson” means

The arrival rate in queuing theory

In queuing problems, which of the following probability distributions is typically used to describe the number of arrivals per unit of time

Poisson

Know the characteristics of a waiting line

Waiting time to be served and waiting time in system

Which of the following is NOT a common queuing situation

parcel delivery truck following its computer-generated route

Model A

Single Channel; one door; Poisson

Model B

Multi-channel distribution; more than one door

Model C

Constant service; single channel; constant arrival and constant service

An airline ticket counter, with several agents for one line of customers, is an example of

A multi-channel, single phase system

Understand the variables used to measure a que’s performance

All of the above (utilization factor, average queue length, probability of a specific number of customers, avg waiting time in the line)

The sign at the bank reads “Wait here for the next available teller” suggests the use of what waiting line system

Multi Channel

A small hair salon has several operators. While customers do not have appointments, each is waiting to be served by a specific operator. This scenario provides an example of a

multiple single-channel system, limited queue length

A large discount store and supermarket has a hair salon on its premises. Salon customers can shop in other parts of the store until their name is called for salon service. This scenario provides an example of a

multi-channel, unlimited queue length

Which one of the following is NOT a characteristic of a model B

single channel

Which of the following is NOT a characteristic of a Model A

limited population size

P=£/µ

percent of time that the machine is used

Lq=£²[µ(µ-£)]

the average length of the queue

Ls=£/(µ-£)

the average # of students in the system

Wq=£/µ(µ-£)

the average time spend waiting in the queue

Ws=1/µ-£

average time in the system

£/µ

equals busy

1-£/µ

equals idle