Equipment Maintenance & Safety Flashcards
7 cards from real CCO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Equipment Maintenance & Safety flashcards as text
Which of the following best describes 'spalling' in the context of cremation retort maintenance?
Answer: Flaking or chipping of the refractory lining due to thermal stress
Spalling is the flaking or chipping of refractory brick or castable lining caused by repeated thermal expansion and contraction cycles.
The primary air supply to a cremation retort's main burner is MOST critical for:
Answer: Providing oxygen for complete combustion of the remains
Primary air supplies oxygen directly to the main burner and primary chamber to support complete combustion of human remains.
During a cremation, heavy black smoke is observed exiting the stack. The FIRST corrective action should be:
Answer: Check and adjust the secondary (afterburner) chamber temperature and airflow
Black smoke indicates incomplete combustion in the secondary chamber; adjusting afterburner temperature and airflow is the immediate corrective step.
Why is it important to allow a retort to cool gradually rather than forcing rapid cooling after a cremation cycle?
Answer: Sudden temperature changes cause thermal shock, which can crack the refractory lining
Thermal shock from rapid cooling causes differential expansion stresses that crack or spall the refractory, shortening lining life.
A retort's thermocouple is reading abnormally low temperatures despite the burner firing at full capacity. The MOST likely issue is:
Answer: The thermocouple is faulty, incorrectly positioned, or coated with ash buildup
A thermocouple coated with residue, incorrectly positioned, or malfunctioning will give inaccurate readings, making temperature control unreliable.
Which gas detector should be installed in a crematory facility to protect workers from a potentially fatal leak in gas-fired retort equipment?
Answer: Combustible gas detector (natural gas/propane) and carbon monoxide (CO) detector
Combustible gas detectors alert to fuel leaks that could cause fire or explosion, while CO detectors warn of incomplete combustion producing toxic gas.
What is the function of the secondary combustion chamber's residence time requirement?
Answer: To ensure combustion gases are held at required temperature long enough to destroy pollutants
Residence time ensures flue gases remain at the required temperature (typically ≥1,800°F for ≥1 second) to achieve complete destruction of organic compounds and reduce visible emissions.