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:
Predetermined motion time study
Understanding Work Measurement Techniques
Work measurement is a systematic process for establishing the time required for a qualified worker to carry out a task at a defined level of performance. Various techniques are used for this purpose, each suited for different types of work and levels of detail.
Identifying the Correct Work Measurement Technique
The question describes a technique where times for basic human motions are pre-established and used to build up the total time for a job. Let's examine the given options to find the technique that fits this description.
- Work sampling: This involves observing a worker or a group of workers at random intervals over a period of time to determine the proportion of time spent on various activities. It gives an estimate of how time is distributed among different tasks or delays, but it does not use pre-established times for basic motions.
- Time study: This involves directly observing a worker performing a task, timing each element of the task using a stopwatch or video, and adjusting the observed time based on the worker's performance rating and allowances for fatigue and personal needs. While it measures time, it's based on direct observation of a specific task, not building from fundamental motion times.
- Predetermined motion time study: This technique involves breaking down a job into fundamental human motions (like reaching, grasping, moving, positioning). Standard times for these basic motions have been established through extensive research and are available in published tables (e.g., MTM - Methods-Time Measurement, MOST - Maynard Operation Sequence Technique). By summing the times for all the basic motions required to complete a job, the total standard time for the job can be determined. This method precisely matches the description provided in the question.
- Analytical estimating: This technique is often used for non-repetitive or long-cycle jobs where direct time study or PMTS is not practical. It involves analyzing the job, breaking it into elements, and estimating the time for each element based on experience, historical data, and knowledge of the work. It relies on estimation rather than pre-established times for basic motions.
Conclusion on Work Measurement Technique
Based on the analysis, the technique that uses times established for basic human motions to build up the time for a job at a defined level of performance is Predetermined Motion Time Study.
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
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:
Which of the following is best fit for analyzing the effect of variable, relationship and manipulation of a model?
