FSD Actuators, Controls & Automatic Operation

Question 1

What is the primary function of a fusible link in a fire damper?

Accepted Answer

To hold the damper open and release it when heat causes it to melt

Answer

To provide electrical power to the actuator

Answer

To indicate the damper position to the control system

Answer

To regulate airflow through the duct

Question 2

At what temperature is the most common standard fusible link for fire dampers in typical HVAC duct systems rated to melt?

Accepted Answer

165°F (74°C)

Answer

135°F (57°C)

Answer

212°F (100°C)

Answer

250°F (121°C)

Question 3

Which type of actuator is required for smoke dampers that must respond to signals from a fire alarm system?

Accepted Answer

Electric or electro-pneumatic actuator

Answer

Fusible link actuator

Answer

Manual crank actuator

Answer

Gravity-operated actuator

Question 4

What does a 'spring return' feature in a smoke damper actuator ensure?

Accepted Answer

The damper returns to its fail-safe position upon loss of power

Answer

The damper opens faster during normal HVAC operation

Answer

The actuator automatically resets after each fire alarm test

Answer

The damper maintains a fixed position regardless of airflow changes

Question 5

What is the typical fail-safe position for a smoke damper actuator?

Accepted Answer

Fully closed

Answer

Fully open

Answer

50% open

Answer

Locked in last position

Question 6

Which signal most commonly triggers the automatic closure of a smoke damper in a commercial building?

Accepted Answer

An electrical signal from the fire alarm control panel

Answer

A temperature rise detected by a fusible link

Answer

A pressure drop in the HVAC duct system

Answer

A manual command from building maintenance

Question 7

Which organization provides listings and certifications for fire and smoke damper actuators under standards such as UL 555 and UL 555S?

Accepted Answer

Underwriters Laboratories (UL)

Answer

NFPA

Answer

ASHRAE

Answer

OSHA