CWLP Quality Control 2 — Questions and Answers
Question 1: Which statistical tool is used to identify the root cause of defects by organizing potential causes into categories?
- Pareto chart
- Fishbone diagram (Correct answer)
- Control chart
- Scatter diagram
Correct answer: Fishbone diagram
A fishbone (Ishikawa) diagram categorizes potential causes of a defect into branches such as man, machine, method, and material.
Question 2: A warehouse receives a shipment of 5,000 units. Using an AQL of 2.5 with a sample size of 125, inspectors find 6 defects. What is the appropriate action?
- Accept the shipment (Correct answer)
- Reject the shipment
- Re-sample the entire lot
- Return half the shipment
Correct answer: Accept the shipment
At AQL 2.5 with a sample size of 125, the acceptance number is typically 7, so 6 defects falls within the acceptable range.
Question 3: What does FIFO stand for in warehouse quality and inventory management?
- First In, First Out (Correct answer)
- Final Inspection, Final Output
- Freight In, Freight Out
- First Intake, Final Output
Correct answer: First In, First Out
FIFO (First In, First Out) ensures older inventory is used or shipped before newer stock, reducing spoilage and obsolescence.
Question 4: Which document provides the agreed-upon specifications and quality standards that inbound shipments must meet?
- Bill of lading
- Purchase order
- Vendor quality agreement (Correct answer)
- Packing list
Correct answer: Vendor quality agreement
A vendor quality agreement formally defines the quality standards, inspection criteria, and compliance requirements that suppliers must meet.
Question 5: A control chart shows data points consistently trending upward over 7 consecutive points. This pattern indicates:
- Normal random variation
- A process shift requiring investigation (Correct answer)
- Acceptable statistical noise
- Measurement error only
Correct answer: A process shift requiring investigation
Seven consecutive points trending in one direction is a Western Electric rule violation, signaling a non-random process shift that requires investigation.
Question 6: What is the primary purpose of a goods receipt inspection in a warehouse setting?
- To verify invoice amounts match purchase orders
- To confirm inbound items meet quantity, quality, and labeling requirements (Correct answer)
- To update inventory records in the WMS
- To assign storage locations to incoming products
Correct answer: To confirm inbound items meet quantity, quality, and labeling requirements
Goods receipt inspection verifies that incoming shipments match ordered quantities, meet quality standards, and are correctly labeled before acceptance.
Question 7: Which quality metric measures the percentage of orders shipped without errors in quantity, item, and documentation?
- On-time delivery rate
- Perfect order rate (Correct answer)
- Fill rate
- Order cycle time
Correct answer: Perfect order rate
The perfect order rate tracks the percentage of orders delivered complete, on time, undamaged, and with accurate documentation.
CWLP Quality Control 2
Which statistical tool is used to identify the root cause of defects by organizing potential causes into categories?