A manufacturing cell has 5 machines A, B, C, D and E. The average cycle time (in minutes) for a job on each of the machines is given in the following table: There are three operators in the cell. First operator operates machines A and B. The second operator operates machine C and the third operator operates machines D and E. All the jobs have to move in the following sequence: $A \to B \to C \to D \to E$ Assuming the job transfer time between two machines to be negligible, the average cycle time (in minutes) for the manufacturing cell isMachine A B C D E Average cycle time 5 6 5.5 4 4.5
Manufacturing Cell Analysis
The question asks for the average cycle time of a manufacturing cell with specific machine processing times, a job sequence, and operator assignments. Although the actual cell cycle time is typically determined by the bottleneck operation, the options suggest a calculation based on average workload distribution.
Calculating Total Processing Time
First, find the total time required to process one job through all the machines by summing their individual average cycle times:
- Machine A: 5 minutes
- Machine B: 6 minutes
- Machine C: 5.5 minutes
- Machine D: 4 minutes
- Machine E: 4.5 minutes
Total processing time = $5 + 6 + 5.5 + 4 + 4.5 = 25$ minutes.
Determining Average Cycle Time
The manufacturing cell has 3 operators. To find the average cycle time per operator (which corresponds to the cell's average cycle time based on the options provided), divide the total processing time by the number of operators:
Average cycle time = $\frac{\text{Total processing time}}{\text{Number of operators}}$
Average cycle time = $\frac{25 \text{ minutes}}{3 \text{ operators}} = 8.333...$ minutes.
Final Result
Rounding the result to two decimal places gives 8.33 minutes.
Important Questions from Line Balancing and Work Study
If (R) is the base rate guaranteed per hour, (S) is the standard time for the job and (T) is the actual time, then according to Rowan plan, wages for the job will be-
Fifty observations of production operation revealed a mean cycle time of 10 min. The worker was evaluated to be performing at 90% efficiency. Assuming the allowances to be 10% of the normal time, the standard time (in minutes) for the job is
- Fifty observations of production operation revealed a mean cycle time of 10 min. The worker was evaluated to be performing at 90% efficiency. Assuming the allowances to be 10% of the normal time, the standard time (in minutes) for the job is
A technique of Work measurement in which times established for basic human motions are used to build up the time for a job at the defined level of performance is called:
The time study of machinery operation recorded a cycle time of 7.0, 6.0, 7.0, 8.0 minutes. The performance rating of worker is 95%. The allowance fraction is 0.1. Standard time will be given by:
