Supply Chain- CH. 10
Poisson distribution
where one is interested in the number of arrivals during some time period T
In a college registration process, several department heads have to approve an individual student's semester course load. What is the queuing system line structure? A. Single channel, single phase B. Single channel, multiphase C. Multichannel, single phase D. Multichannel, multiphase E. None of these
B
In modeling a simulation, random numbers from 00 to 99 are assigned with the intervals determined from frequency distributions for each behavior occurrence. Assume there are two behaviors, A and B, out of 100 tallies. On behavior A you record 45 tallies, and on behavior B you record 55 tallies. Which of the following is a correct random-number interval for behavior A? A. 00 to 45 B. 00 to 44 C. 56 to 99 D. 55 to 100 E. 45 to 100
B
For an infinite queuing situation, if the arrival rate for loading trucks is 5 trucks per hour, what is the mean time between arrivals? A. 5 hours B. 2.5 hours C. 0.2 hour D. 0.1 hour E. None of these
C
In modeling a simulation, random numbers from 00 to 99 are assigned with the intervals determined from frequency distributions for each behavior occurrence. Assume there are two behaviors, X and Y, out of 50 tallies. On behavior X you record 20 tallies, and on behavior Y you record 30 tallies. Which of the following is a correct random-number interval for behavior X? A. 00 to 19 B. 01 to 20 C. 00 to 39 D. 41 to 61 E. 45 to 100
C
Machine breakdown and repair in a 12-machine factory having three repair mechanics would develop which type of queuing system line structure concerning machine breakdowns? A. Single channel, single phase B. Single channel, multiphase C. Multichannel, single phase D. Multichannel, multiphase E. None of these
C
Standing in line to buy a ticket for a movie where there are multiple windows at which to buy tickets is which type of queuing system line structure? A. Single channel, single phase B. Single channel, multiphase C. Multichannel, single phase D. Multichannel, multiphase E. None of these
C
A roller coaster ride in an amusement park employs which type of queuing system line structure? A. Single channel, single phase B. Single channel, multiphase C. Multichannel, single phase D. Multichannel, multiphase E. None of these
A
Getting an autograph from a famous person might involve standing in which type of queuing line structure? A. Single channel, single phase B. Single channel, multiphase C. Multichannel, single phase D. Multichannel, multiphase E. None of these
A
Which of the following are the three major components of a queuing system? A. The source population, how customers exit the system, and the queuing discipline B. The number of servers, the service speed, and the waiting line C. The source population, how the customer exits the system, and the servicing system D. The source population and the way customers arrive at the system, the serving systems, and how customers exit the system E. The service speed, the queue discipline, and the waiting line
C
Which of the following is a suggestion for managing queues that is mentioned in the textbook? A. Put up a serpentine lane to keep people from jumping ahead in line. B. Use humor to defuse a potentially irritating situation. C. Segment the customers. D. Assure customers that the wait is fair, and inform them of the queue discipline. E. Tell people in the queue that each will be served as soon as possible.
C
Which of the following is a suggestion for managing queues that is mentioned in the textbook? A. Put up a serpentine lane to keep people from jumping ahead in line. B. Use humor to defuse a potentially irritating situation. C. Train your servers to be friendly. D. Assure customers that the wait is fair, and inform them of the queue discipline. E. Tell people in the queue that each will be served as soon as possible.
C
Assume the service rate for a queue in a truck-loading operation is 2 trucks per hour. Using the infinite queuing notion for the models presented in the textbook, which of the following is the average service time? A. 2 hours B. 1 hour C. 0.5 hour D. 0.25 hour E. None of these
C
Buying a ticket for a college football game where there are multiple windows at which to buy the ticket features which type of queuing system line structure? A. Single channel, single phase B. Single channel, multiphase C. Multichannel, single phase D. Multichannel, multiphase E. None of these
C
Buying food at a large food store with multiple checkout counters features which type of queuing system line structure? A. Single channel, single phase B. Single channel, multiphase C. Multichannel, single phase D. Multichannel, multiphase E. None of these
C
Machine breakdown and repair in a 12-machine factory having one repair mechanic would develop which type of queuing system line structure concerning machine breakdowns? A. Single channel, single phase B. Single channel, multiphase C. Multichannel, single phase D. Multichannel, multiphase E. None of these
A
Which of the following is a suggestion for managing queues presented in the textbook? A. Train your servers to be friendly. B. Tell customers that the line should encourage them to come during slack periods. C. Give each customer a number. D. Periodically close the service channel to temporarily disperse the line. E. Use humor to defuse a potentially irritating situation.
A
Which of the following is an example of general-purpose simulation software? A. PC-MODEL B. MAP/1 C. SIMFACTORY D. Canella IV E. OPUS/2.3
A
Which of the following queue disciplines is discussed in the textbook? A. Emergencies first B. Garner-Whitten formula C. Newest customer first D. Patient customers last E. None of these
A
Which of the following is an example of a finite population in a queuing system? A. People waiting to place their order at a fast-food restaurant B. The departmental faculty in line at the copier C. People waiting in line at an ATM D. Patients seeking help in a hospital emergency room E. Taxpayers calling for assistance from the IRS
B
Which of the following is an example of general-purpose simulation software? A. Link Trainer Programs B. SIMSCRIPT II.5 C. SIM-Central D. C++ E. Visual Basic =
B
Which of the following is not a queue discipline discussed in the textbook? A. First come, first served B. Last in, first out C. Limited needs D. Shortest processing time E. Best customer first
B
Which of the following is not a suggestion for managing queues presented in the textbook? A. Train your servers to be friendly. B. Segment the customers. C. Determine an acceptable waiting time for your customers. D. Inform your customers of what to expect. E. Encourage customers to come during slack periods.
C
A small vendor has either a good day of sales with an average of $1,000 or a bad day with an average of only $500 for the day. To simulate these outcomes, random numbers from 00 to 99 should be assigned with the intervals determined from the frequency distribution. If, during the last 100 days, the vendor had 27 good days and 73 bad days, which of the following is a correct random-number interval for a bad day? A. 28 to 99 B. 27 to 73 C. 27 to 100 D. 27 to 99 E. 00 to 26
D
In essence, a queuing system includes several major components. Which of the following is not one of them? A. Source population B. Servicing system C. How the customer exits the system D. The queue discipline E. None of these
D
Which of the following is not an example of general-purpose simulation software? A. SIMAN B. GPSS/PC C. RESQ D. GAPE/H E. SLAMII
D
Finite population
limited-size customer pool that will use the service and, at times, form a line
Constant arrival distributions
periodic, with exactly the same time between successive arrivals
Infinite population
population large enough so that the population size caused by subtractions or additions to the population does not significantly affect the system probabilities
Arrival rate
the number of units arriving per period
A company is concerned about the number of customers who have to wait for service in its customer service department. Assume the rate at which customers are serviced is 12 per hour. Using the infinite queuing notion for the models presented in the textbook, which of the following is the mean time between arrivals? A. 12 minutes B. 6 minutes C. 2 minutes D. 1 minute E. None of these
E
Which of the following is not a suggestion for managing queues presented in the textbook? A. Try to divert your customer's attention when waiting. B. Segment the customers. C. Encourage customers to come during the slack periods. D. Train your people to be friendly. E. Periodically close the service channel to temporarily disperse the line.
E
Queue discipline
a priority rule or set of rules for determining the order of service to customers in a waiting line
Variable (random) arrival distributions
arrival probabilities described statistically