Quality Inspection Flashcards
7 cards from real BOC 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 Inspection flashcards as text
What is the main goal of a root cause analysis after a repeated equipment failure?
Answer: To find the underlying cause so the failure does not happen again
Root cause analysis looks past the symptoms to the underlying cause, so corrective action prevents the failure from coming back.
How is predictive maintenance different from preventive maintenance?
Answer: Predictive maintenance uses condition monitoring data to schedule work when it is needed
Predictive maintenance uses measurements such as vibration, thermography, and oil analysis to act on actual equipment condition, not elapsed time.
Before closing a work order, what should a quality inspection confirm?
Answer: The work is complete, the equipment runs correctly, and the details are documented
Closeout should confirm the repair fixed the problem, the system runs normally, and the work history is recorded.
What is the correct way to verify the accuracy of a BAS space temperature sensor?
Answer: Compare its reading with a calibrated reference instrument at the same location
Calibration means comparing the sensor with a traceable reference instrument placed at the same point and correcting any offset.
An operator reviews BAS trend logs and sees the heating valve and cooling valve open at the same time on one air handler. What does this show?
Answer: Simultaneous heating and cooling, which wastes energy
Unless the system is designed for reheat dehumidification, heating and cooling at the same time is a control fault that wastes energy.
Which instrument is used with a duct traverse to measure air velocity for checking airflow?
Answer: A pitot tube with a manometer
A pitot tube measures velocity pressure at multiple traverse points, which are converted to velocity and then multiplied by the duct area to get CFM.
What is retro-commissioning?
Answer: A systematic commissioning process for an existing building that was never commissioned
Retro-commissioning applies the commissioning process to an existing building that was never commissioned, so its systems can be tuned to meet current needs.