To answer this question, you need to understand the objective of time study.
Time study is a technique used in industrial engineering to determine the time required for a worker to complete a specific task or operation. The objective of time study is to establish a standard time for completing the task, which can be used for various purposes such as labor cost estimation, production planning, and performance evaluation.
Now let's go through each option to understand why it is correct or incorrect:
Option A) a new worker - This option is incorrect because time study is not specifically focused on determining the time taken by a new worker. Time study can be used to determine the time taken by workers of different skill levels, including new workers, but it is not limited to them.
Option B) a trainee - This option is incorrect for the same reason as Option A. Time study can be used to determine the time taken by trainees, but it is not limited to them.
Option C) a very good worker - This option is incorrect because time study is not specifically focused on determining the time taken by a very good worker. Time study aims to determine the standard time required for completing a task, regardless of the worker's skill level.
Option D) efficient machine utilization - This option is the correct answer. The objective of time study is to determine the time taken for a task to achieve efficient machine utilization. By studying the time required for each task, companies can optimize their machine utilization and identify any inefficiencies or bottlenecks in their production process.
Therefore, the correct answer is D) efficient machine utilization. This option is correct because it aligns with the objective of time study.