In the fire main system, quick cleaning strainers are located at the __________.

Correct Answer: Option D — fire hydrants

Quick-cleaning strainers are installed at fire hydrants to prevent debris, scale, or marine growth from entering the fire hose and clogging the nozzle. This ensures that the water stream remains unobstructed, maintaining the nozzle's ability to produce the required fog or solid stream patterns during critical fire suppression.