QUESTION 12 Consider a 4-step process with all the steps in a series. Each step

Question

QUESTION 12

Consider a 4-step process with all the steps in a series. Each step takes 6 min/unit. If the processing time of the first step is reduced to 5 min/unit, the minimum flow time of the process will not reduce.

True

False

QUESTION 13

A process has three steps. There is one worker at each step. The time taken at step 1 is 4 minutes, at step 2 is 6 minutes and at step 3 is 10 minutes. Steps 1 and 2 are sub-assemblies that are done in parallel, and feed to the assembly step 3. The minimum flow time of the process is:

11 minutes

13 minutes

16 minutes

19 minutes

QUESTION 14

Capacity utilization and labor utilization of a process are always equal.

True

False

QUESTION 15

A process has three steps. There is one worker at each step. The time taken at step 1 is 4 minutes, at step 2 is 6 minutes and at step 3 is 10 minutes. If one more worker is added at step 3, the capacity of the process before and after adding these workers is

6 units/hour; 12 units/hr

4 units/hour; 8 units/hr

6 units/hr; 10 units/hr

4 units/hour; 6 units/hr

11 minutes

13 minutes

16 minutes

19 minutes

Explanation / Answer

QUESTION 12: Consider a 4-step process with all the steps in a series. Each step takes 6 min/unit. If the processing time of the first step is reduced to 5 min/unit, the minimum flow time of the process will not reduce.

This statement is false

The minimum flow time of the process is the average time taken to complete the each step of the process from first step to last. If each step takes 6 min/unit then the minimum flow time of the process is 24 min (= 6 min + 6 min + 6 min + 6 min). If the processing time of the first step is reduced to 5 min/unit, the minimum flow time of the process will be 19 min (= 1 min + 6 min + 6 min + 6 min). Therefore the minimum flow time of the process will reduce.

QUESTION 13: A process has three steps. There is one worker at each step. The time taken at step 1 is 4 minutes, at step 2 is 6 minutes and at step 3 is 10 minutes. Steps 1 and 2 are sub-assemblies that are done in parallel, and feed to the assembly step 3. The minimum flow time of the process is:

Steps 1 and 2 are sub-assemblies that are done in parallel means it takes 6 minutes to complete step 1 and step 2 together (maximum time taken by any of these steps) and feed to the assembly step 3 means step 3 starts after 6 minutes (after completing step 1 and step 2). Step 3 takes 10 minutes.

Therefore the minimum flow time of the process is 6 minutes + 10 minutes = 16 minutes

Therefore correct answer is option c. 16 minutes.

QUESTION 14: Capacity utilization and labor utilization of a process are always equal.

This statement is false.

Capacity utilization is actual output out of potential or designed capacity of a process which can be achieved under ideal condition. It is generally expressed in percentage.

Labor utilization of a process is actual contribution of the workers out of available time of workers towards the process. It is also expressed in percentage.

QUESTION 15: A process has three steps. There is one worker at each step. The time taken at step 1 is 4 minutes, at step 2 is 6 minutes and at step 3 is 10 minutes. If one more worker is added at step 3, the capacity of the process before and after adding these workers is

Capacity of the process per hour = one hour/ processing time of bottleneck

Where bottleneck is the step which takes maximum time to process

Before adding worker, bottleneck of the process is step 3 which takes 10 minutes per unit to process

Therefore the capacity of the process before adding these workers = one hour / 10 minutes per unit

Or 60 minutes/ 10 minutes per unit = 6 units/ hour

After adding worker, bottleneck of the process is step 2 which takes 6 minutes per unit to process (now step 3 will take only 5 minutes to process per unit so it is not the bottleneck of the process)

Therefore the capacity of the process after adding these workers = one hour / 6 minutes per unit

Or 60 minutes/ 6 minutes per unit = 10 units/ hour

Therefore correct answer is option c. 6 units/hr; 10 units/hr

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