Question 1

A waiting line or __________ is where items or people are in a line awaiting service; __________ is a body of knowledge about waiting lines.

Accepted Answer

queue, que

Question 2

Of the three types of queue discipline, only __________ is assumed by the four primary waiting line models.

Accepted Answer

FIFO or FI

Question 3

There is only one bay and one type of service at an automatic car wash. Provide the most likely characteristics of this system.
a. name of model
b. number of channels
c. number of phases
d. arrival rate distribution
e. service time distribution
f. population size
g. queue discipline

Accepted Answer

Constant service (M/

Question 4

Which of the following represents a customer that reneged due to the waiting-line?

Accepted Answer

A)  A husband and wife decide to eat out instead after seeing the movie ticket line. 
B)  A car drives past the first fast-food restaurant on Hamburger Row because the drive-through was full. 
C)  A Black Friday shopper skipped one store because the line went around the building. 
D)  A student ordered pizza online because the phone line was busy. 
E)  A customer at a gas station went inside to buy a soda, but after waiting in line for a minute left the soda behind and went outside empty-handed. 
A)  A husband and wife decide to eat out instead after seeing the movie ticket line. 
B)  A car drives past the first fast-food restaurant on Hamburger Row because the drive-through was full. 
C)  A Black Friday shopper skipped one store because the line went around the building. 
D)  A student ordered pizza online because the phone line was busy. 
E)  A customer at a gas station went inside to buy a soda, but after waiting in line for a minute left the soda behind and went outside empty-handed.

Question 5

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

Accepted Answer

A)  binomial 
B)  normal 
C)  Poisson 
D)  exponential 
E)  lognormal 
A)  binomial 
B)  normal 
C)  Poisson 
D)  exponential 
E)  lognormal

Question 6

Study of waiting-line models helps operations managers better understand

Accepted Answer

A)  service systems such as bank teller stations 
B)  maintenance activities that might repair broken machinery 
C)  shop-floor control activities 
D)  service systems such as amusement park rides 
E)  all of the above 
A)  service systems such as bank teller stations 
B)  maintenance activities that might repair broken machinery 
C)  shop-floor control activities 
D)  service systems such as amusement park rides 
E)  all of the above

Question 7

What costs are present in waiting line analysis?
 How do these costs vary with the level of service?

Accepted Answer

The costs are the cost of providing serv

Question 8

Suppose that 1 customer arrives each minute in a Poisson distribution. Is it more likely that 2 customers or 0 customers will arrive each minute?

Accepted Answer

P(0)=e^-1*1^0/0! = .368
P(2)=e

Question 9

In a repetitive focus factory, the number of channels available for the processing of a certain part would likely refer to

Accepted Answer

A)  the number of successive operations that have to be performed on that part 
B)  the number of machines doing the same necessary operations 
C)  the number of parts waiting to be processed 
D)  all of the above depending on the layout 
E)  none of the above 
A)  the number of successive operations that have to be performed on that part 
B)  the number of machines doing the same necessary operations 
C)  the number of parts waiting to be processed 
D)  all of the above depending on the layout 
E)  none of the above

Question 10

A finite population waiting line model has an average service time T of 200 minutes and an average time between service requirements U of 300 minutes; the service factor X is

Accepted Answer

A)  0.20 
B)  0.40 
C)  0.60 
D)  0.67 
E)  2.5 
A)  0.20 
B)  0.40 
C)  0.60 
D)  0.67 
E)  2.5

Question 11

What are the assumptions underlying the M/M/1 waiting line model?
 Which of these also hold for the M/D/1 model?

Accepted Answer

The assumptions underlying the standard

Question 12

Students arrive randomly at the help desk of the computer lab. There is only one service agent, and the time required for inquiry varies from student to student. Arrival rates have been found to follow the Poisson distribution, and the service times follow the negative exponential distribution. The average arrival rate is 12 students per hour, and the average service rate is 20 students per hour. A student has just entered the system. How long is she expected to stay in the system?

Accepted Answer

A)  0.125 minute 
B)  0.9 minute 
C)  1.5 minutes 
D)  7.5 minutes 
E)  0.075 hour 
A)  0.125 minute 
B)  0.9 minute 
C)  1.5 minutes 
D)  7.5 minutes 
E)  0.075 hour

Question 13

Suppose that a service facility has an average line of 2 customers that must wait, on average, 5 minutes for service. How many customers are arriving per hour?

Accepted Answer

Use Little's Law that 2 custom

Question 14

The shopper who says to himself, "I've waited too long in this line. I don't really need to buy this product today," and leaves the store is an illustration of which element of arrival behavior?

Accepted Answer

A)  random arrival 
B)  renege 
C)  random departure 
D)  balk 
E)  none of the above 
A)  random arrival 
B)  renege 
C)  random departure 
D)  balk 
E)  none of the above

Question 15

A finite population waiting line model has an average service time T of 100 minutes and an average time between service requirements U of 400 minutes; the service factor X is 0.25.

Accepted Answer

A) True 
 B)False

Question 16

A single-phase waiting-line system meets the assumptions of constant service time or M/D/1. Units arrive at this system every 10 minutes on average. Service takes a constant 4 minutes. The average length of the queue Lq is

Accepted Answer

A)  0.4 
B)  0.133 
C)  4.167 
D)  4.583 
E)  6 
A)  0.4 
B)  0.133 
C)  4.167 
D)  4.583 
E)  6

Question 17

Balk and renege are elements of queue discipline.

Accepted Answer

A) True 
 B)False

Question 18

A waiting-line system that meets the assumptions of M/M/1 has = 1, = 4. Calculate Pₒ. Build a table showing the probability of more than 0, 1, 2, 3, 4, 5, 6,and 7 units in the system. Round to six decimal places in your work

Accepted Answer

The answer of A waiting-line system that meets the assumptions...

Question 19

A queuing model which follows the M/M/1 assumptions has λ = 3 and μ = 2. The average number in the system is

Accepted Answer

A)  -3 
B)  3 
C)  0.667 
D)  150 percent 
E)  growing without limit, since λ is larger than μ. 
A)  -3 
B)  3 
C)  0.667 
D)  150 percent 
E)  growing without limit, since λ is larger than μ.

Question 20

Arrivals or inputs to a waiting-line system have characteristics that include

Accepted Answer

A)  population size 
B)  population behavior 
C)  population's statistical distribution 
D)  A and C 
E)  A, B, and C 
A)  population size 
B)  population behavior 
C)  population's statistical distribution 
D)  A and C 
E)  A, B, and C

Exam 24: Waiting-Line Models

A waiting line or __________ is where items or people are in a line awaiting service; __________ is a body of knowledge about waiting lines.

Of the three types of queue discipline, only __________ is assumed by the four primary waiting line models.

There is only one bay and one type of service at an automatic car wash. Provide the most likely characteristics of this system. a. name of model b. number of channels c. number of phases d. arrival rate distribution e. service time distribution f. population size g. queue discipline

Which of the following represents a customer that reneged due to the waiting-line?

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

Study of waiting-line models helps operations managers better understand

What costs are present in waiting line analysis? How do these costs vary with the level of service?

Suppose that 1 customer arrives each minute in a Poisson distribution. Is it more likely that 2 customers or 0 customers will arrive each minute?

In a repetitive focus factory, the number of channels available for the processing of a certain part would likely refer to

A finite population waiting line model has an average service time T of 200 minutes and an average time between service requirements U of 300 minutes; the service factor X is

What are the assumptions underlying the M/M/1 waiting line model? Which of these also hold for the M/D/1 model?

Suppose that a service facility has an average line of 2 customers that must wait, on average, 5 minutes for service. How many customers are arriving per hour?

The shopper who says to himself, "I've waited too long in this line. I don't really need to buy this product today," and leaves the store is an illustration of which element of arrival behavior?

A finite population waiting line model has an average service time T of 100 minutes and an average time between service requirements U of 400 minutes; the service factor X is 0.25.

A single-phase waiting-line system meets the assumptions of constant service time or M/D/1. Units arrive at this system every 10 minutes on average. Service takes a constant 4 minutes. The average length of the queue Lq is

Balk and renege are elements of queue discipline.

A waiting-line system that meets the assumptions of M/M/1 has = 1, = 4. Calculate Pₒ. Build a table showing the probability of more than 0, 1, 2, 3, 4, 5, 6,and 7 units in the system. Round to six decimal places in your work

A queuing model which follows the M/M/1 assumptions has λ = 3 and μ = 2. The average number in the system is

Arrivals or inputs to a waiting-line system have characteristics that include

Operations and Productivity

Operations Strategy in a Global Environment

Project Management

Forecasting

Design of Goods and Services

Managing Quality

Statistical Process Control

Process Strategy

Capacity and Constraint Management

Location Strategies

Layout Strategies

Human Resources, Job Design, and Work Measurement

Supply-Chain Management

Outsourcing as a Supply-Chain Strategy

Inventory Management

Aggregate Planning

Material Requirements Planning MRP and ERP

Short-Term Scheduling

Just-In-Time and Lean Options

Maintenance and Reliability

Decision-Making Tools

Linear Programming

Transportation Models

Learning Curves

Simulation

Filters

A waiting line or is where items or people are in a line awaiting service; is a body of knowledge about waiting lines.