Question

The operation chart of a method of assembling nuts and bolts for a left-handed operator has been illustrated in the figure.

Which ONE or MORE among the following options is/are CORRECT?

• A. The work distribution between the two hands is not balanced.
• B. The two hands do not follow opposite motions.
• C. The work is well distributed between the two hands.
• D. The dominant hand of the operator performs majority of the tasks.

Hint:

Compare how many active tasks each hand performs and whether their motions mirror each other, then check which hand is actually the dominant one.

Answer 1

The Correct Option is A, B

Step 1: Understanding the Question:
The figure is a two-hand process chart for assembling a nut and bolt, listing what the left hand and the right hand are each doing at every step, for an operator who is left-handed.
We need to judge the quality of this work method using the basic principles of motion economy, which say that both hands should share the workload evenly and should move in a coordinated, mirror-like way.

Step 2: Looking at the Work Distribution:
Reading down the left-hand column, the hand is mostly Idle at the start, then simply Grasps and Holds the bolt, meaning it acts like a stationary clamp for most of the cycle, and finishes Idle again.
Reading down the right-hand column, that hand is constantly busy: going to bin 1, picking the bolt, bringing it over, going to bin 2, picking the nut, bringing it over, screwing the nut on, grasping the finished assembly, moving it to bin 3, and releasing it.
Nearly every task in this chart, including the fine motor step of screwing the nut onto the bolt, is done by the right hand while the left hand does almost nothing, so the workload is clearly not shared evenly between the two hands, which makes statement (A) true and statement (C), which claims the work is well distributed, false.

Step 3: Looking at the Motion Pattern:
Good two-hand practice calls for symmetrical, opposite motions, for example both hands reaching outward together and returning together, so that the body stays balanced and neither hand waits idly for the other.
In this chart, the left hand stays essentially fixed in place holding the bolt while the right hand alone travels back and forth between bin 1, bin 2, and bin 3, so the two hands are not moving in mirrored, opposite paths at all.
This confirms statement (B) is true, since the hands clearly do not follow opposite motions.

Step 4: Checking the Dominant-Hand Claim:
The operator is stated to be left-handed, so their dominant, more skillful hand is the left hand.
But the chart assigns almost every active and precise task, including the screwing motion, to the right hand instead, leaving the dominant left hand underused as a simple holding fixture.
This is the opposite of what statement (D) claims, so (D) is false.

Final Answer:
The chart shows unbalanced work and non-opposite hand motions, so statements (A) and (B) are the correct ones. \[ \boxed{\text{Correct options: A, B}} \]