NRFSP Cleaning and Sanitizing 1 — Questions and Answers
Question 1: What is the correct sequence for the manual warewashing three-compartment sink?
- Rinse, wash, sanitize, air dry
- Wash, sanitize, rinse, air dry
- Wash, rinse, sanitize, air dry (Correct answer)
- Scrape, sanitize, wash, rinse
Correct answer: Wash, rinse, sanitize, air dry
The correct three-compartment sink procedure is: scrape/pre-rinse, wash in detergent, rinse, sanitize, then air dry.
Question 2: What is the minimum concentration for a chlorine (bleach) sanitizing solution used on food-contact surfaces?
- 10 ppm
- 25 ppm
- 50 ppm (Correct answer)
- 100 ppm
Correct answer: 50 ppm
Chlorine sanitizing solutions must be at least 50 ppm to effectively sanitize food-contact surfaces per FDA Food Code.
Question 3: What is the difference between cleaning and sanitizing?
- They are the same process
- Cleaning removes pathogens; sanitizing removes dirt
- Cleaning removes visible soil; sanitizing reduces pathogens to safe levels (Correct answer)
- Sanitizing must always be done before cleaning
Correct answer: Cleaning removes visible soil; sanitizing reduces pathogens to safe levels
Cleaning physically removes soil and debris, while sanitizing uses heat or chemicals to reduce microbial populations to safe levels.
Question 4: How often must food-contact surfaces be cleaned and sanitized during continuous use?
- Once per day at closing
- Every 2 hours
- Every 4 hours (Correct answer)
- Only when visibly soiled
Correct answer: Every 4 hours
Food-contact surfaces in continuous use must be cleaned and sanitized at least every 4 hours to prevent bacterial buildup.
Question 5: What water temperature is required for the wash compartment of a three-compartment sink?
- 100°F minimum
- 110°F minimum (Correct answer)
- 120°F minimum
- 140°F minimum
Correct answer: 110°F minimum
The wash compartment must maintain a minimum water temperature of 110°F for effective cleaning detergent action.
Question 6: Which sanitizer works most effectively at a concentration between 200–400 ppm?
- Chlorine (bleach)
- Iodine
- Quaternary ammonium compounds (quats) (Correct answer)
- Hydrogen peroxide
Correct answer: Quaternary ammonium compounds (quats)
Quaternary ammonium compounds (quats) are most effective at 200–400 ppm and are less affected by organic matter than chlorine.
NRFSP Cleaning and Sanitizing 1
What is the correct sequence for the manual warewashing three-compartment sink?