The work distribution between the two hands is not balanced.
The two hands do not follow opposite motions.
The work is well distributed between the two hands.
The dominant hand of the operator performs majority of the tasks.
Show Solution
The Correct Option isA, B
Solution and Explanation
Step 1: The Principles We Are Checking Against:
Two rules from motion economy apply directly to a two-hand process chart: first, both hands should carry a roughly equal share of the work, and second, the hands should move together in a balanced, mirror-image pattern rather than one hand sitting still.
This solution checks the four given statements against the chart one at a time, rather than describing the whole chart first.
Step 2: Testing Statement (A), Balance of Work:
Counting the symbols in each column, the right hand has roughly ten active steps (travel, grasp, release, assemble, screw) while the left hand has essentially only one meaningful step, holding the bolt in place, sandwiched between two Idle periods.
Ten-plus active steps against effectively one is a heavily lopsided split, so statement (A), 'work distribution is not balanced,' matches the chart, TRUE.
Step 3: Testing Statement (C), the Opposite Claim:
Statement (C) claims the opposite of (A), that the work is well distributed. Since we already established the split is roughly ten tasks to one, this statement contradicts the chart, so (C) is FALSE.
Step 4: Testing Statement (B), Opposite Motions:
'Opposite motions' would mean, for instance, the left hand reaches to a bin at the same time the right hand returns, in a mirrored rhythm.
Here the left hand does not reach anywhere at all after grasping the bolt, it just holds position, while the right hand does all the reaching to bin 1, bin 2, and bin 3 by itself.
Since one hand is static while the other moves alone, there is no opposite or mirrored motion happening, so statement (B) is TRUE.
Step 5: Testing Statement (D), Dominant Hand Usage:
The operator is left-handed, so the left hand is the dominant one. Statement (D) claims the dominant hand does most of the work.
But we already found the right hand, the non-dominant hand here, performs almost every task, including the precise screwing action, while the dominant left hand only holds the bolt still.
This is the reverse of what (D) claims, so (D) is FALSE.
Final Answer:
Checking each statement individually against the chart confirms only (A) and (B) hold true.
\[ \boxed{\text{Correct options: A, B}} \]
