opp Flashcards
In a store there are 5 people waiting in line for the payment. There are 2 cash counters and the service of each cashier is 2 people every 10 minutes. Each cashier has its own queue. What is the queue configuration?
a. 2M/M/2 b. 2M/M/1 c. M/M/5 d. M/M/2
b. 2M/M/1
Chose the one correct answer regarding the graph with X being the AS-IS situation
a. To move from X to Y, we want to reduce the average number of units in line, we should reduce the utilization rate by reducing the number of resources
b. Process variability results in simultaneous waiting and resources underutilization
c. In order to move from X to Z, we should reduce system variability by introducing
more resources
d. All the answers are correct
B
In a bar, the barman is able to serve 2 people every 8 minutes. The arrival rate of clients has been estimated to be around 10 people every hour. Estimated the saturation of the barman.
a. 0.5 b. 0.2 c. 1.5 d. 0.67
D
In a grocery, there are 5 people waiting in line for the payment. There are 2 cash counters, and the service rate of each cashier is 2 people every 10 minutes. The clients are served by the 2 cashiers following a FIFO approach in one single line. What is the queue configuration?
a. 2 M/M/2
b. 2 M/M/1
c. M/M/5
d. M/M/2
D
Choose only one correct answer regarding the customer behaviour in a queuing system modelling
a. Rejecting is when a customer already in the queue gives up the service and goes away without being served
b. Balking is when a customer already in queue gives up the service and goes away without being served
c. Reneging is when a customer already in queue gives up the service and goes away without being served
d. Reneging is when a customer decides not to enter a queue because it is already too long
C
With Pre-Shop-Pool and workload planning, the company :
a. Reduces WIP and Shop-Floor time
b. Controls the production and reduces necessity operators
c. Reduces setups
d. Immediately releases production orders to shorten lead-time
A
what are the pros for the leading strategy
a. Lower impact of unforeseen events and underestimating demand, spare parts
capacity, better deliver reliability
b. Lower production costs, lower impact from overestimating demand, high plant
utilization
c. Lower impact of unforeseen events, high plant utilization, spare parts capacity,
better delivery reliability
d. Outbound cash flow, higher impact of overestimating demand, higher production
costs
A
In the service industry, the level of satisfaction of a customer has been defined
a. By the experience
b. As the difference between the expectation and the service price
c. As the difference between perception and expectation
d. By the experience of the outcome
C
What are the service product characteristics?
a. Simultaneity, customer participation, homogeneity, perishability
b. Perishability, intangibility, time consuming, homogeneity, customer participation
c. Intangibility, simultaneity, heterogeneity, customer involvement in the service
process, perishability
d. Simultaneity, heterogeneity, invisibility, customer involvement in the service
process, perishability
C
How would you compute the variability?
a. The difference between the average value and the actual value
b. The difference between the average value and the forecasted value
c. The difference between the average value and the forecasted value (sì, era doppia)
d. The difference between the actual value and the forecasted value
A
Investing in cross-trained employees supports company to
a. Reduce demand variability
b. Make capacity more flexible
c. Increase time-buffer for customers
d. Increase overall capacity
B
Which characteristic belongs to a professional service shop compared to professional service? a. More attention to quality b. Request of knowledge sharing c. Less attention to cost d. More product innovation
B
You are a manager of a restaurant; if your service process (output) is affected by variability, which lever do you invest in?
a. Reservation system
b. Promotion
c. Standardization of activities
d. Increase customer participation in the process
C
Which characteristic belongs to a performance that is classified as Order Qualifier?
a. Companys quality performance is very good
b. If companys performance improves, the company gains more orders
c. If companys performance gets worse, the company loses orders
d. The performance defines the competitive advantage of the company
C
The assembly stage of Ryccar Spa company process 5 variants of bikes and works 1350 min/day. Average demand is equal to 50 bikes/day. Assembly sage is fully dedicated, and its availability is 75%. Cycle time to assemble bikes is 18 min/bike. Assembly stage requires a setup every time the variant changes. Changeover time is equal to 35min/setup. Which of the following EPE for the assembly stage is the correct one?
a. 1.16 days
b. 0.38 days
c. 1.45 days
d. 0.79 days
A
which is the most probable decision you can find if a company decides to drive digital transformation through lean principles?
a. Automations in order to exploit new technologies for increasing capacity
b. HMI technologies in order to increase flexibility of operators
c. RFiD technologies in order to track real time product status
B
Consider a manufacturing company producing machine tools and define which activity is value adding:
a. Test a product before sending it to the customer
b. Inserting a ball shift on its shaft
c. Bring electric motors from the warehouse to the place where machine tool is
assembled
d. Plan internal and external operators9 activities for the next week
B
During SMED
a. Setup activities are automatized
b. Internal activities are moved to the begin or to the end of setup procedure
c. External activities are moved to the begin or to the end of setup procedure
d. Products are batched in order to reduce setups
C
Shotter Spa produces pencils and works with 2 shifts (Ta=900 min/day). The average demand is 300 pencil/day. There are 2 production stages, both fully dedicated and with availability of 100%: P1 (CT=30 sec/pencil; CO=5 min/setup) and P2 (CT= 25sec/pencil; CO=0 min/setup). Which is the Minimum Batch Size of the company?
a. MBS= 2 pencil/batch
b. MBS= 150 pencil/batch
c. MBS= unitary batch
d. MBS= 230 pencil/batch
A
Considering an R&D department led by Lean Innovation concepts, which is the most probable context you can find?
a. Function Pushing for perfect learning cycle, launching product on the market only when all the features are completed
b. Function Pushing for fast learning cycle through many small iterative projects
c. Function Pushing for fast learning cycle with very big teams in order to have more
resources on the same projects
d. Teams working at the same time on more projects in parallel
B KAIZEN
Which is the longest time in an operations system?
a. Throughput time
b. Value adding time
c. Cycle time
d. Not-value adding time
D
Bendys Spa is a MTO company. Production process is made by 4 stages with the following EPE values: EPE(S1)=3.15 days; EPE(S2)=0.16 days; EPE(S3)=0; EPE(S4)=1.14 days. Which is the time period necessary to Bendys Spa to produce the whole mix and satisfy required by the customers?
a. 3.15 days
b. 1.14 days
c. It depends on the amount of stocks and raw materials
d. 1.1125 days
A
The impact of Heijunka box is of
a. Creating continuous flows
b. Reducing bullwhip effect
c. Increase safety stocks
d. Reducing setups
B
DECAF conditions analysis supports managers in
a. Increase availability of a cell
b. Defining optimal level of stocks
c. Improving planning of production
d. Understanding gap for creating continuous flow
D