Quality Assurance Flashcards
7 cards from real SE ENGR. practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Quality Assurance flashcards as text
Which IEC 61215 environmental test exposes PV modules to 85°C and 85% relative humidity for 1,000 hours?
Answer: Damp heat
The damp heat test (85°C/85% RH for 1,000 h) evaluates resistance to long-term moisture ingress.
During IEC 61215 hail testing, what is the standard ice ball diameter and velocity?
Answer: 25 mm at 23 m/s
The baseline hail test fires 25 mm ice balls at 23 m/s at specified impact points.
An electroluminescence (EL) image of a new module shows dark branching lines across several cells. What defect does this most likely indicate?
Answer: Cell microcracks
Dark lines in EL images reveal electrically inactive regions caused by cell microcracks.
What is the minimum plane-of-array irradiance generally required by IEC TS 62446-3 for meaningful infrared thermography of operating PV arrays?
Answer: 600 W/m²
IEC TS 62446-3 calls for at least 600 W/m² so current-driven thermal anomalies are clearly visible.
In an FMEA, how is the Risk Priority Number (RPN) calculated?
Answer: Severity × Occurrence × Detection
RPN is the product of severity, occurrence, and detection ratings, used to prioritize failure modes.
Which standard specifies requirements for laboratories that perform accredited PV module testing and calibration?
Answer: ISO/IEC 17025
ISO/IEC 17025 defines competence requirements for testing and calibration laboratories.
A commissioning crew measures string open-circuit voltages and finds one string about one-third of a module's Voc lower than its identical neighbors. What is the most likely cause?
Answer: A shorted bypass diode in one module
A shorted bypass diode removes one cell substring, dropping string Voc by roughly one-third of a module Voc.