A-4. A notation D/M/3/FCFS/1 5/ao defines a queuing system with: a. 3 servers, 1
ID: 1885438 • Letter: A
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A-4. A notation D/M/3/FCFS/1 5/ao defines a queuing system with: a. 3 servers, 15 customers max, exponentially distributed inter-arrival times, first-in- b. 15 servers, 3 customers, constant service times, first-in-first-out service method, c. 3 servers, 15 customers max, distributed service times, first-come-first-served d. 15 servers, 3 customers, constant service times, first-come-first-served service e. 1 server, 3 customers, 15 waiting places, expected service times, last-come-first- first-out service method, and constant service times. and maximally distributed inter-arrival times. service method, and expected inter-arrival times method, and distributed inter-arrival times. served service method, and moderately distributed inter-arrival times. Explanation: A-5. If a vertical road curve has negative entering and exiting grades then the following statement is correct: a. b. c. d. e. f. g. Explanation: The curve is sag vertical curve The curve is crest vertical curve The curve cannot be either sag or crest vertical curve The curve can be either sag or crest vertical curve The curve can be sag, but cannot be crest vertical curve The curve can be crest, but cannot be sag vertical curve None of the above A-6. A stop sign controlling a four-way stop intersection represents a: a. Warning Sign b. Circular Sign c. Regulatory Sign d. Informational Sign e. Guide Sign f. Turn-movement Prohibition Sign g. Lane-use Sign Explanation A-7. Relationship between spacing and density is analogue to the relationship between: a. Spacing and volume b. Volume and density c. Headway and density d. Headway and volume e. Volume and headway f. Spacing and headwayExplanation / Answer
A-4. ANS-(c) D-represents the deterministic or constant value,M-represents exponential service time distribution,3-represents the number of channels(servers),FCFS-represents first come first served,15-represents the maximum number of customers in total.
A-5.ANS-(f) Sag curves are used where the change in grade is positive,such as valleys while Crest curves are used when the change in grade is negative.,such as hills.In this case as both entry and exit grades are negative that's why the curve can be crest but cannot be sag vertical curve.
A-6 ANS-(c) At a four-way stop if two vehicles reach the intersection simultaneously,the vehicle on the left must yield the right-of-way to the vehicle on the right.
A-7 ANS-(e) Relationship between spacing and density is analogue to the relationship between Volume and headway.
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