Actuators, Controls & Automatic Operation Flashcards
7 cards from real FSD practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Actuators, Controls & Automatic Operation flashcards as text
Per UL 555S requirements, what is the maximum time allowed for a smoke damper to reach its fully closed position after receiving an activation signal?
Answer: 75 seconds
UL 555S requires smoke dampers to close within 75 seconds of receiving an activation signal, balancing rapid response with the mechanical time needed to move large damper assemblies.
What is the function of a 'supervisory' signal in a fire damper monitoring system?
Answer: It monitors and reports the operational status or fault conditions of fire protection equipment
Supervisory signals monitor the operational readiness of fire protection equipment, alerting operators to conditions like a bypassed detector or tampered device that could compromise fire protection.
Which NFPA standard specifically addresses the design, installation, testing, and maintenance of smoke control systems including smoke dampers?
Answer: NFPA 92
NFPA 92 (Standard for Smoke Control Systems) specifically covers the design, installation, testing, and maintenance of smoke control systems, including smoke dampers and their associated controls.
How does a combination fire/smoke damper differ from a standalone smoke damper in terms of activation?
Answer: It activates on both smoke detection via an electrical signal and excessive heat via a fusible link
A combination fire/smoke damper incorporates both a fusible link for heat-triggered closure and an electric actuator for smoke-signal-triggered closure, responding to both types of fire conditions.
What is the role of duct smoke detectors in relation to smoke damper automatic operation?
Answer: They detect smoke in the airstream and signal the FACP to close associated smoke dampers
Duct smoke detectors sample the airstream within the duct and, upon detecting smoke, send a signal to the FACP, which then commands the associated smoke dampers to close.
When a building automation system (BAS) is integrated with smoke damper controls, what is a mandatory life safety requirement?
Answer: The fire alarm system must take priority over BAS commands during a fire event
Fire codes require that the fire alarm system always takes priority over BAS commands during a fire event, ensuring life safety functions cannot be overridden by routine HVAC control logic.
What is the purpose of verifying smoke damper actuator 'end-of-travel' limits during commissioning?
Answer: To verify the damper achieves fully open and fully closed positions and that limit switches accurately report those positions
Testing end-of-travel limits during commissioning confirms the damper reaches fully open and fully closed positions and that limit switches accurately report these positions to the fire alarm panel or BAS.