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These 10 free SCS questions are organized by exam domain, so you can see how each part of the Smoke Control Systems Technician blueprint is tested. Reveal the answer and explanation under each question.
An airflow drawing shows return branch RA from Zone A and branch RB from Zone B joining upstream of exhaust fan EF-1. Damper DA is in RA, DB is in RB, and DC is in the common duct after the junction. Damper DO serves a separate outdoor-air supply. For a fire in Zone A, the design calls for exhausting A while isolating B from that exhaust path. Which damper must close to provide that isolation?
Correct answer: A - DB, in the return branch from Zone B
The project reference list must address stair pressurization, zoned smoke exhaust, system controls, and acceptance and periodic performance testing. Which standard provides the primary requirements for the smoke-control system as a whole?
Correct answer: C - NFPA 92
A pressurized vestibule is intended to provide a pressure cascade from stair to vestibule to corridor. Simultaneous readings at the same elevation, all relative to one common reference, are: stair +45 Pa, vestibule +15 Pa, and corridor +30 Pa. The doors are closed. These readings reveal which unintended leakage direction?
Correct answer: A - From the corridor toward the vestibule
On a calm winter morning, a high-rise stair shaft is substantially warmer than the outdoor air. Before the pressurization fan starts, pressure relative to outdoors is negative near the bottom and positive near the top. The pattern persists with the other building fans off. What is the dominant driving force?
Correct answer: C - Normal stack effect from the warmer shaft air
The stair supply fan is interlocked with its intake damper's fully-open end switch. During automatic activation, the damper is still traveling within its allowed time; open proof and the fan start command are both OFF. At this stage, the technician should:
Correct answer: D - Allow damper travel, then verify fan startup after open proof
At turnover, an SCS operations and maintenance manual contains the system purpose, design targets, inspection frequencies, test procedures, and manufacturers' instructions. It does not show how the installed system actually performed when commissioned. Which missing record would establish the verified performance baseline for later comparisons?
Correct answer: C - The installed system's measured performance during initial commissioning
A stair pressurization system delivers its specified airflow with the design number of doors open. When those doors close, stair pressure exceeds the permitted maximum and the doors become difficult to open. Fan speed remains at its approved setting. Which fault best fits this change in performance?
Correct answer: B - A barometric relief damper that cannot open
For a specified closed-door test, the approved criterion is 25-50 Pa with the stair at higher pressure than the corridor. A correctly zeroed differential manometer has its HIGH port in the corridor and LOW port in the stair. It reads -0.14 in. w.g. Using 1 in. w.g. = 249 Pa, how should this pressure measurement be interpreted?
Correct answer: D - About 35 Pa, stair higher; the specified pressure range is satisfied
During a scheduled smoke-control test in an occupied building, a security officer reports visible smoke on a floor that is not involved in the test. The test uses simulated alarm inputs, not smoke. What takes priority now?
Correct answer: A - Suspend testing and activate the building's emergency response procedure
An office zone uses variable-air-volume terminals for comfort conditioning and smoke-control pressurization. In smoke mode, the central supply fan reaches its scheduled smoke-mode speed, but the terminals remain under room-temperature control and throttle as the rooms cool. The zone then loses its required positive pressure. What change would correct this conflict between comfort control and smoke-control operation?
Correct answer: B - Override room-temperature control with the approved smoke-mode terminal airflow settings
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