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1 | |
A waiting line tends to form when service capacity exceeds demand. |
| | A) | True |
| | B) | False |
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2 | |
Service time is the reciprocal of service rate. |
| | A) | True |
| | B) | False |
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3 | |
As system utilization increases, the expected number of customers waiting for service increases. |
| | A) | True |
| | B) | False |
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4 | |
For infinite source systems, the average number of customers being served is equal to the arrival rate divided by the service rate. |
| | A) | True |
| | B) | False |
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5 | |
A three-step repair service with one server at each step would be an example of a: |
| | A) | multiple-phase, multiple-channel system. |
| | B) | single-phase, multiple-channel system. |
| | C) | multiple-phase, single-channel system. |
| | D) | none of these. |
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6 | |
A system with an arrival rate of two per hour, a service time of 20 minutes, and one server, would have a utilization of. |
| | A) | 10% |
| | B) | 33% |
| | C) | 40% |
| | D) | 67% |
| | E) | none of these |
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7 | |
Waiting lines tend to form in underloaded systems because: |
| | A) | capacity always exceeds demand. |
| | B) | capacity sometimes exceeds demand. |
| | C) | demand always exceeds supply. |
| | D) | demand sometimes exceeds supply. |
| | E) | none of these. |
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8 | |
For an infinite-source system with an arrival rate of 6 per hour (Poisson) and service time of 6 minutes per customer (exponential), the average number being served is: |
| | A) | .10 |
| | B) | .60 |
| | C) | 1.0 |
| | D) | none of these |
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9 | |
Why is there waiting in an infinite source queuing system? |
| | A) | poor scheduling |
| | B) | slow service |
| | C) | low utilization |
| | D) | variability in arrival and service rates |
| | E) | multiple phase processing |
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10 | |
The term "queue discipline" refers to: |
| | A) | the willingness of customers to wait in line for service |
| | B) | having multiple waiting lines without customers switching from line to line |
| | C) | the order in which customers are processed |
| | D) | the reason waiting occurs in underloaded systems |
| | E) | none of these |
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11 | |
When the cost incurred by all customers is not the same, an appropriate queuing model is: |
| | A) | single channel, single phase |
| | B) | single channel, multiple phase |
| | C) | multiple channel, single priority |
| | D) | multiple channel, multiple phase |
| | E) | multiple channel, multiple priority |
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12 | |
A queuing system has four crews with three members each. The number of "servers" is: |
| | A) | 3 |
| | B) | 4 |
| | C) | 7 |
| | D) | 12 |
| | E) | 1 |
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