Quality Control Quiz

The ceramic factory aims to achieve Six Sigma quality in tile dimensions. What does this mean in terms of defects?

• 3.4 defects per hundred tiles

• 3.4 defects per thousand tiles

• 3.4 defects per million tiles

• 3.4 defects per billion tiles

A factory produces tiles with a target thickness. Consider two scenarios: Scenario 1: Three Sigma Process Scenario 2: Six Sigma Process Which of the following statements is most likely true when comparing these scenarios?

• The Three Sigma process produces a higher percentage of tiles that meet the thickness specifications.

• The Six Sigma process has a higher probability of producing tiles with incorrect thickness.

• The Three Sigma process is more capable and consistent.

• The Six Sigma process can be expected to have significantly fewer defects.

A company manufactures screws. They have a customer who requires that the length of the screws be within a specific range: 2.5 cm ± 0.1 cm. The company's manufacturing process currently operates at a Three Sigma level for screw length. Does the company's Three Sigma process meet the customer's specification for screw length if the standard deviation is less than 0.033 cm?

A company manufactures screws. They have a customer who requires that the length of the screws be within a specific range: 2.5 cm ± 0.1 cm. The company's manufacturing process currently operates at a Three Sigma level for screw length. Does the company's Three Sigma process meet the customer's specification for screw length if the standard is 0.05 cm?

The plant is experiencing a high number of defective bicycles due to faulty brakes. Which problem statement is MOST effective?

• The brake systems are failing quality checks at an unacceptable rate.

• The bicycle assembly line has a 5% defect rate due to improperly installed brake cables, leading to increased rework costs and potential safety hazards for riders.

• The quality control procedures for brake inspection are inadequate and require revision.

• A new brake testing system is needed to reduce the current defect rate.

Which of the following activities are typically performed during the Define phase of a Six Sigma DMAIC project? (Select all that apply)

• Defining Critical to Quality (CTQ) characteristics that translate customer needs into measurable terms.

• Creating a process map to visualize the steps involved in the process being improved.

• Conducting a Gage R&R study to assess measurement system variability.

• Gathering Voice of the Customer (VOC) data to understand customer needs and expectations.

• Developing a project charter that outlines the project goals, scope, and team members.

A company manufactures metal rods for use in construction. They need to ensure that the diameter of the rods is within a specific range to meet customer requirements and safety standards. The customer specifies that the rod diameter should be 10 mm ± 0.5 mm. The company uses a control chart to monitor the diameter of the rods during production. Which of the following statements correctly describes the difference between the Upper Control Limit (UCL) and the Upper Specification Limit (USL) for the rod diameter?

• The UCL is derived from process data to monitor variability, while the USL represents the maximum acceptable value defined by the customer for the rod diameter.

• The UCL and the USL serve the same purpose in quality control and can be used interchangeably in practice.

• The UCL is determined by customer requirements and design specifications, while the USL is calculated from the collected production data.

• The UCL is calculated from the process data to detect when the process is out of control, while the USL is set by the customer to define the acceptable range.