Process Measurement & Metrics Flashcards
7 cards from real CPS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Process Measurement & Metrics flashcards as text
Takt time in process measurement is calculated as:
Answer: Available production time divided by customer demand rate
Takt time = Available production time / Customer demand, setting the pace at which a process must operate to meet demand without overproducing.
The process capability index Cp measures:
Answer: The ratio of the specification width to the natural process variation (6σ)
Cp = (USL − LSL) / 6σ, comparing the width of customer specifications to the spread of natural process variation to assess potential capability.
First Pass Yield (FPY) is defined as the percentage of:
Answer: Units that complete a process correctly without any rework or repair on the first attempt
FPY measures the proportion of units that pass through the entire process correctly the first time, with no rework, scrap, or repair needed.
In Statistical Process Control (SPC), control limits are set at:
Answer: ±3 standard deviations from the process mean
Control limits are placed at ±3σ from the process mean, representing the range of natural process variation; points outside indicate special-cause variation.
Mean Time Between Failures (MTBF) is a metric used to measure:
Answer: The average operating time between consecutive failures of a process or system
MTBF quantifies the average duration of successful operation between failures, serving as a reliability indicator for equipment and processes.
Cost of Poor Quality (COPQ) includes which of the following categories?
Answer: Prevention, appraisal, internal failure, and external failure costs
COPQ encompasses all four cost-of-quality categories: prevention (avoiding defects), appraisal (inspecting for defects), and both internal and external failure costs.
Defect rate as a process metric is most accurately expressed as:
Answer: The ratio of defective units to total units produced, often expressed as a percentage
Defect rate = (Defective units / Total units produced) × 100%, providing a normalized measure of quality that allows comparison across different production volumes.