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NICET FAS-III study materials
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NICET FAS-III practice questions

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Question 1Codes, Standards, and References (e.g., NFPA 72)

Which document is the primary standard governing the design, installation, testing, and maintenance of fire alarm and signaling systems?

  1. NFPA 13, Standard for the Installation of Sprinkler Systems
  2. NFPA 70, National Electrical Code
  3. NFPA 72, National Fire Alarm and Signaling Code Correct answer.
  4. NFPA 101, Life Safety Code

Explanation

NFPA 72 is the National Fire Alarm and Signaling Code and covers the application, design, installation, commissioning, inspection, testing, and maintenance of fire alarm and signaling systems. The other documents govern electrical wiring, life safety/egress, and sprinkler installation respectively.

Question 2Codes, Standards, and References (e.g., NFPA 72)

Fire alarm circuit conductors in a commercial building, both power-limited and non-power-limited, are governed by which article of NFPA 70?

  1. Article 725
  2. Article 700
  3. Article 760 Correct answer.
  4. Article 770

Explanation

Article 760 of the National Electrical Code covers fire alarm systems and includes the requirements for non-power-limited fire alarm circuits and power-limited fire alarm circuits. Article 725 covers Class 1, 2, and 3 remote-control and signaling circuits that are not part of a fire alarm system.

Question 3Codes, Standards, and References (e.g., NFPA 72)

For public mode notification, audible appliances must produce a sound level of at least what value measured 10 ft (3 m) from the appliance?

  1. 70 dBA
  2. 65 dBA
  3. 85 dBA
  4. 75 dBA Correct answer.

Explanation

NFPA 72 requires public mode audible appliances to produce at least 75 dBA at 10 ft (3 m) and at least 15 dBA above the average ambient sound level. Private mode has a lower 10 ft threshold of 45 dBA.

Question 4Codes, Standards, and References (e.g., NFPA 72)

When several types of signals are present at the same time, which signal is required to take precedence at the control unit?

  1. Trouble signal
  2. Monitor or security signal
  3. Fire alarm signal Correct answer.
  4. Supervisory signal

Explanation

NFPA 72 establishes a signal priority in which fire alarm signals take precedence over supervisory, trouble, and other signals. Lower priority signals may be displayed but must not obscure or replace the alarm indication.

Question 5Codes, Standards, and References (e.g., NFPA 72)

A ground fault develops on a supervised fire alarm circuit. How is this condition annunciated at the control unit?

  1. Supervisory
  2. Trouble Correct answer.
  3. Monitor
  4. Alarm

Explanation

A ground fault is an abnormal condition affecting the integrity of the circuit, so it is annunciated as a trouble signal. Trouble signals indicate circuit faults, power failures, and other impairments of the system's ability to perform its intended function.

Question 6Codes, Standards, and References (e.g., NFPA 72)

In NFPA 72, the requirements for inspection, testing, and maintenance of fire alarm systems are located in which chapter?

  1. Chapter 14 Correct answer.
  2. Chapter 26
  3. Chapter 10
  4. Chapter 17

Explanation

NFPA 72 devotes a separate chapter to inspection, testing, and maintenance, and in current editions that is Chapter 14. It contains the testing frequencies, test methods, and record-keeping requirements.

Question 7Codes, Standards, and References (e.g., NFPA 72)

Which NFPA 72 form is completed and signed to certify that a fire alarm system has been installed in accordance with the design and the code?

  1. Record of Inspection and Testing
  2. As-built drawing set
  3. Record of Completion Correct answer.
  4. Sequence of Operation matrix

Explanation

The Record of Completion is the document signed by the installing contractor and the owner or owner's representative to certify that the system has been installed in accordance with the design and NFPA 72. The Record of Inspection and Testing documents the results of periodic testing rather than installation.

Question 8Codes, Standards, and References (e.g., NFPA 72)

On a smooth, flat ceiling, what is the maximum permitted spacing between spot-type smoke detectors for a standard (prescriptive) layout?

  1. 20 ft
  2. 15 ft
  3. 30 ft Correct answer.
  4. 25 ft

Explanation

NFPA 72 permits a maximum spacing of 30 ft (9.1 m) between spot-type smoke detectors on smooth ceilings, with the first detector located no more than 15 ft from a side wall. This yields a nominal coverage of about 900 sq ft per detector.

Question 9Codes, Standards, and References (e.g., NFPA 72)

A duct-type smoke detector is required where the design capacity of an air handling unit exceeds which value?

  1. 5,000 cfm
  2. 1,000 cfm
  3. 2,000 cfm Correct answer.
  4. 15,000 cfm

Explanation

Air handling systems with a capacity greater than 2,000 cfm are required to have duct-type smoke detection, a requirement originating in the air conditioning and ventilating installation standards that NFPA 72 references. NFPA 72 also requires duct detectors where airflow would prevent smoke from reaching area detectors.

Question 10Codes, Standards, and References (e.g., NFPA 72)

Spot-type heat detectors listed for 25 ft spacing are installed on a smooth ceiling. What is the maximum permitted distance from a detector to a wall or partition?

  1. 15 ft
  2. 6 ft
  3. 12.5 ft Correct answer.
  4. 25 ft

Explanation

For prescriptive spacing, the distance from a detector to a side wall is limited to half the listed spacing, so a device listed at 25 ft must be within 12.5 ft of the wall. The same half-spacing rule applies to smoke detectors, giving 15 ft for a 30 ft listed spacing.

Question 11Codes, Standards, and References (e.g., NFPA 72)

What distinguishes a Class A initiating device circuit from a Class B circuit?

  1. Class A circuits are limited to 24 V nominal and Class B circuits are not
  2. Class A circuits are permitted to be installed without supervision
  3. Class A circuits continue to operate with a single open in the circuit Correct answer.
  4. Class A circuits require an end-of-line resistor installed at the control unit

Explanation

A Class A circuit is arranged so that a single open or ground fault does not prevent the circuit from performing its intended function, and the fault is annunciated as a trouble. A Class B circuit will not operate beyond a single open and relies on an end-of-line device at the far end.

Question 12Codes, Standards, and References (e.g., NFPA 72)

Which of the following conditions must be monitored by the fire alarm system and annunciated as a supervisory signal?

  1. Actuation of a manual pull station at an exit
  2. Actuation of a waterflow switch on a wet-pipe system
  3. A closed sprinkler control valve Correct answer.
  4. Alarm from a duct smoke detector in an air handler

Explanation

Off-normal positions of sprinkler control valves are supervisory conditions and must be annunciated as supervisory signals. Waterflow, duct detector alarms, and manual pull stations are alarm-initiating devices whose actuation produces an alarm signal.

Question 13Codes, Standards, and References (e.g., NFPA 72)

Under NFPA 72, what is the minimum frequency for functional testing of smoke detectors?

  1. Semi-annually
  2. Annually Correct answer.
  3. Monthly
  4. Quarterly

Explanation

The NFPA 72 testing table requires smoke detectors to be functionally tested at least annually using a listed aerosol or equivalent method. Quarterly testing is applied to other devices such as waterflow switches, and semi-annual testing applies to items such as valve supervisory switches in some editions.

Question 14Codes, Standards, and References (e.g., NFPA 72)

A smoke detector installed in an elevator machine room actuates. What action must the fire alarm system initiate?

  1. Illuminate only a local trouble light at the machine room
  2. Initiate Phase II in-car operation for the fire service
  3. Initiate Phase I recall Correct answer.
  4. Shunt-trip the elevator main line power immediately

Explanation

NFPA 72 requires smoke detectors in elevator machine rooms, hoistways, and lobbies to initiate Phase I emergency recall of the elevator. Phase II in-car operation is a separate function initiated manually by emergency responders.

Question 15Codes, Standards, and References (e.g., NFPA 72)

Where automatic sprinklers protect an elevator machine room or hoistway, NFPA 72 requires that elevator power be removed by a shunt trip activated by which device?

  1. A heat detector listed for the purpose Correct answer.
  2. The waterflow switch for that sprinkler system
  3. A manual pull station at the designated level
  4. A lobby smoke detector at the designated level

Explanation

NFPA 72 requires a listed heat detector in the machine room, hoistway, or pit where sprinklers are present, arranged to shunt-trip elevator power before waterflow occurs. Using the waterflow switch itself would allow water discharge before power is removed.

Question 16Codes, Standards, and References (e.g., NFPA 72)

Testing and acceptance of a smoke control system that interfaces with the fire alarm system is governed primarily by which document?

  1. NFPA 25
  2. NFPA 72 Chapter 17
  3. NFPA 92 Correct answer.
  4. NFPA 101

Explanation

NFPA 92, Standard for Smoke Control Systems, contains the design, installation, acceptance testing, and periodic testing requirements for smoke control systems. NFPA 72 addresses the fire alarm interface and the emergency control functions that operate the smoke control equipment.

Question 17Codes, Standards, and References (e.g., NFPA 72)

A continuously staffed monitoring location on the protected premises, operated by facility employees, that monitors the fire alarm systems of that same facility is classified as which type of supervising station?

  1. Remote supervising station
  2. Auxiliary supervising station
  3. Proprietary Correct answer.
  4. Central station

Explanation

NFPA 72 defines a proprietary supervising station as one located on the protected premises and operated by the owner to monitor systems of that same property. A central station is a commercial off-premises facility serving many customers.

Question 18Codes, Standards, and References (e.g., NFPA 72)

Why are voltage-drop calculations performed for a notification appliance circuit?

  1. To verify the minimum listed operating voltage is maintained at each appliance Correct answer.
  2. To confirm the sound level at 10 ft reaches 75 dBA in all occupied areas
  3. To verify the total circuit current does not exceed the rating of the control unit battery charger
  4. To prove the appliances draw no more than 50 percent of the circuit's rated current

Explanation

Voltage-drop calculations confirm that conductor resistance does not reduce the voltage at the furthest appliance below its listed minimum operating voltage. Appliances operating below their listed voltage may fail to produce rated sound output or may not operate at all.

Question 19Codes, Standards, and References (e.g., NFPA 72)

Where is the end-of-line device for a Class B notification appliance circuit required to be installed?

  1. At the junction box nearest the control unit
  2. At the control unit's terminals
  3. At the first appliance on the circuit
  4. At the last appliance on the circuit Correct answer.

Explanation

A Class B circuit is supervised by an end-of-line device installed beyond the last appliance so that an open anywhere in the circuit is detected. Placing it elsewhere would leave a portion of the circuit unsupervised.

Question 20Codes, Standards, and References (e.g., NFPA 72)

What is the purpose of alarm verification on a smoke detection circuit?

  1. Delay alarm processing while the detector resets and confirms the alarm Correct answer.
  2. Allow building occupants to disable detection during cooking operations
  3. Eliminate the requirement for a trouble signal at the control unit
  4. Reduce the required standby battery capacity of the control unit by 50 percent

Explanation

Alarm verification briefly resets the detector and waits a preset period; the alarm is only processed if the detector signals again within that time, which reduces nuisance alarms from transient conditions. The verification time is limited by code so that legitimate alarms are not excessively delayed.

Question 21Codes, Standards, and References (e.g., NFPA 72)

A pathway survivability Level 2 is specified for an emergency communications system. What protection does NFPA 72 require for the pathway?

  1. No additional protection beyond normal circuit requirements
  2. Protection by the building sprinkler system alone
  3. 1-hour fire resistance with no other protection
  4. 2-hour fire resistance or circuit integrity cable Correct answer.

Explanation

NFPA 72 assigns survivability levels to circuit pathways, with Level 2 requiring a 2-hour fire-resistive pathway or a listed circuit integrity cable system. Level 0 provides no additional protection, and Level 1 corresponds to 1-hour protection or a fully sprinklered building.

Question 22Codes, Standards, and References (e.g., NFPA 72)

A waterflow switch on a wet-pipe sprinkler system must cause an alarm signal at the control unit within what maximum time after water begins flowing at the alarm-initiating rate?

  1. 5 minutes
  2. 90 seconds Correct answer.
  3. 30 seconds
  4. 120 seconds

Explanation

NFPA 72 requires waterflow alarm-initiating devices to operate within 90 seconds of water flow at the alarm-initiating rate. The 90-second window allows the device to ride through pressure surges that would otherwise cause false alarms.

Question 23Codes, Standards, and References (e.g., NFPA 72)

How is Phase II emergency in-car elevator operation normally placed into service?

  1. Automatic activation of the lobby smoke detector
  2. Activation of the heat detector in the machine room
  3. A key-operated switch inside the car Correct answer.
  4. General alarm from any manual pull station in the building

Explanation

Phase II operation is a manual function initiated by emergency responders using a key-operated switch inside the elevator car after Phase I recall has brought the car to the recall level. Automatic detection functions initiate Phase I recall rather than Phase II.

Question 24Codes, Standards, and References (e.g., NFPA 72)

A valve supervisory switch on a sprinkler control valve must annunciate an off-normal condition when the valve has been moved how far?

  1. Five revolutions of the handwheel
  2. Any movement of the valve handle, with no tolerance
  3. Two revolutions of the handwheel Correct answer.
  4. One-half revolution of the handwheel

Explanation

NFPA 72 requires the supervisory switch to signal when the valve is moved two revolutions of the handwheel or one-fifth of the distance to the fully open position, whichever is less. This tolerance prevents nuisance supervisory signals from minor handle movement.

Question 25Codes, Standards, and References (e.g., NFPA 72)

A 24 V fire alarm system has a standby load of 0.5 A and an alarm load of 3.0 A. Using the minimum NFPA 72 secondary supply duration of 24 hours standby plus 5 minutes of alarm, what battery capacity is required before any aging or derating factor is applied?

  1. 12.25 Ah Correct answer.
  2. 3.25 Ah
  3. 14.70 Ah
  4. 12.00 Ah

Explanation

Standby capacity is 0.5 A times 24 hours, or 12.0 Ah, and alarm capacity is 3.0 A times 5/60 hour, or 0.25 Ah, for a total of 12.25 Ah. Any aging or margin factor would be applied to this calculated value afterward.

Question 26Codes, Standards, and References (e.g., NFPA 72)

What is the maximum permitted height above the finished floor for the operable handle of a manual fire alarm box?

  1. 42 in
  2. 48 in Correct answer.
  3. 36 in
  4. 60 in

Explanation

NFPA 72 requires manual fire alarm boxes to be mounted so that the operable handle is not less than 42 in and not more than 48 in above the finished floor. The value 48 in is the upper limit of that range.

Question 27Codes, Standards, and References (e.g., NFPA 72)

Fire alarm control units are required to be listed to which product standard?

  1. UL 464
  2. UL 268
  3. UL 864 Correct answer.
  4. UL 521

Explanation

Fire alarm control units are listed to UL 864, the standard for control units and accessories for fire alarm systems. UL 268 covers smoke detectors, UL 464 covers notification appliances, and UL 521 covers heat detectors.

Question 28Codes, Standards, and References (e.g., NFPA 72)

At the fire alarm control unit, how must alarm, supervisory, and trouble signals be presented?

  1. Visual signals only
  2. Distinguishable signals Correct answer.
  3. Remote station only
  4. Identical audible signals

Explanation

NFPA 72 requires alarm, supervisory, and trouble signals to be clearly distinguishable from one another so that responding personnel can identify the condition. This is typically accomplished through distinct audible and visual indications.

Question 29Codes, Standards, and References (e.g., NFPA 72)

NFPA 72 defines the authority having jurisdiction as which of the following?

  1. The property insurer's risk engineer
  2. The equipment manufacturer's representative
  3. The installing contractor's project manager
  4. The approving organization or individual Correct answer.

Explanation

The authority having jurisdiction is the organization, office, or individual responsible for approving equipment, an installation, or a procedure. The definition focuses on the approving authority rather than on the insurer, installer, or manufacturer.

Question 30Codes, Standards, and References (e.g., NFPA 72)

In public mode, what is the minimum sound pressure level that audible notification appliances must produce at 10 ft when ambient sound is low?

  1. 75 dBA Correct answer.
  2. 80 dBA
  3. 70 dBA
  4. 65 dBA

Explanation

Public mode audible signals must be at least 15 dBA above average ambient or 5 dBA above maximum ambient, whichever is greater, and not less than 75 dBA at 10 ft. With low ambient sound, the 75 dBA floor governs.

Question 31Codes, Standards, and References (e.g., NFPA 72)

A supervising station located at the protected premises and operated by the owner or occupier is known as what type of station?

  1. remote station
  2. proprietary station Correct answer.
  3. central station
  4. auxiliary station

Explanation

A proprietary supervising station is located at the protected premises and is operated by the owner or occupier. Central and remote stations are generally off-premises arrangements, while an auxiliary station connects to a municipal or other reporting system.

Question 32Codes, Standards, and References (e.g., NFPA 72)

Manual fire alarm boxes must be located within what maximum horizontal distance of each exit doorway on each floor?

  1. 10 ft
  2. 5 ft Correct answer.
  3. 20 ft
  4. 15 ft

Explanation

NFPA 72 requires manual fire alarm boxes to be located within 5 ft of each exit doorway on each floor. This ensures occupants can initiate an alarm while using a normal egress path.

Question 33Codes, Standards, and References (e.g., NFPA 72)

A spot-type smoke detector mounted on a ceiling must be at least what distance from a side wall?

  1. 36 in
  2. 4 in Correct answer.
  3. 12 in
  4. 18 in

Explanation

NFPA 72 requires ceiling-mounted spot-type smoke detectors to be located at least 4 in from a side wall to avoid the dead-air space near the wall-ceiling intersection. Larger distances may be used, but 4 in is the minimum clearance.

Question 34Codes, Standards, and References (e.g., NFPA 72)

Wall-mounted visible notification appliances in public mode must be mounted at what height above the finished floor?

  1. 60 in to 72 in
  2. 42 in to 48 in
  3. 96 in to 120 in
  4. 80 in to 96 in Correct answer.

Explanation

NFPA 72 requires wall-mounted visible notification appliances to be mounted not less than 80 in and not more than 96 in above the finished floor, unless the manufacturer's instructions specify otherwise. This range supports visibility and accessibility.

Question 35Codes, Standards, and References (e.g., NFPA 72)

The primary power supply for a fire alarm system must be provided by what type of circuit?

  1. Dedicated branch Correct answer.
  2. Temporary branch
  3. Lighting branch
  4. Receptacle branch

Explanation

NFPA 72 requires the primary power supply to be a dedicated branch circuit with overcurrent protection, arranged so that it cannot be switched off accidentally. It must not be shared with lighting, receptacles, or temporary test circuits.

Question 36Codes, Standards, and References (e.g., NFPA 72)

After discharge, secondary batteries used for fire alarm standby power must be recharged within what maximum time?

  1. 72 hours
  2. 48 hours Correct answer.
  3. 4 hours
  4. 12 hours

Explanation

NFPA 72 requires secondary batteries to be recharged within 48 hours after discharge. This ensures the system can restore its standby capability within a defined period.

Question 37Codes, Standards, and References (e.g., NFPA 72)

What is the fundamental performance requirement for voice alarm notification?

  1. Visible signaling only
  2. Maximum loudness only
  3. Trouble annunciation only
  4. Speech intelligibility Correct answer.

Explanation

Voice alarm systems must deliver messages that are intelligible under expected ambient conditions, not merely loud. Intelligibility is evaluated in the acoustically distinguishable spaces served by the system.

Question 38Codes, Standards, and References (e.g., NFPA 72)

In a positive alarm sequence, an alarm signal at the control unit must be acknowledged within what time to prevent immediate alarm?

  1. 15 seconds Correct answer.
  2. 180 seconds
  3. 60 seconds
  4. 30 seconds

Explanation

A positive alarm sequence permits a brief investigation only if the signal is acknowledged within 15 seconds. If acknowledged, the investigation period is limited to 180 seconds before the system must alarm.

Question 39Codes, Standards, and References (e.g., NFPA 72)

In a combined fire alarm and mass notification system, which signal has the highest priority?

  1. Trouble signal
  2. Fire alarm signal Correct answer.
  3. Supervisory signal
  4. Mass notification message

Explanation

NFPA 72 gives fire alarm signals priority over mass notification signals in combined systems. Mass notification functions must not prevent or delay the fire alarm signal.

Question 40Codes, Standards, and References (e.g., NFPA 72)

Visible notification appliances within the same field of view must do what?

  1. Be disabled during voice messages
  2. Flash in synchronization Correct answer.
  3. Operate continuously
  4. Flash at different rates

Explanation

NFPA 72 requires visible notification appliances in the same field of view to flash in synchronization. Synchronized flashing reduces confusion and the risk of photosensitive seizures.

Question 41Fire Alarm System Fundamentals and Design

According to NFPA 72, the operating handle of a manual fire alarm pull station must be mounted at what height above the finished floor?

  1. 60 in. to 72 in. (1.52 m to 1.83 m)
  2. 42 in. to 48 in. (1.07 m to 1.22 m) Correct answer.
  3. 72 in. to 84 in. (1.83 m to 2.13 m)
  4. 24 in. to 36 in. (0.61 m to 0.91 m)

Explanation

NFPA 72 requires manual fire alarm boxes to be mounted so the operable portion is 42 in. to 48 in. above the finished floor. This range keeps the device reachable for most occupants, including many wheelchair users.

Question 42Fire Alarm System Fundamentals and Design

On a smooth, flat ceiling, what is the maximum listed spacing for spot-type smoke detectors?

  1. 30 ft (9.1 m) Correct answer.
  2. 15 ft (4.6 m)
  3. 60 ft (18.3 m)
  4. 50 ft (15.2 m)

Explanation

NFPA 72 uses 30 ft as the maximum spacing for spot-type smoke detectors on smooth ceilings. The listed spacing of the specific detector may be less, in which case the lower value governs.

Question 43Fire Alarm System Fundamentals and Design

In public mode, a fire alarm notification appliance must produce a sound pressure level at least how far above the ambient noise level?

  1. 20 dBA
  2. 5 dBA
  3. 15 dBA Correct answer.
  4. 10 dBA

Explanation

NFPA 72 public-mode audibility requires the alarm signal to be at least 15 dBA above the ambient sound level. Private-mode signals have a lower 10 dBA threshold, while sleeping areas have additional requirements at the pillow.

Question 44Fire Alarm System Fundamentals and Design

What is the primary function of an end-of-line resistor on a conventional initiating device circuit?

  1. To silence the notification appliances
  2. To limit current to the alarm devices
  3. To supervise the circuit wiring Correct answer.
  4. To provide power to the detectors

Explanation

An end-of-line resistor allows the panel to monitor the circuit current and detect an open in the wiring. A missing or changed resistance causes a trouble indication. It does not power detectors or control notification appliance silencing.

Question 45Fire Alarm System Fundamentals and Design

A waterflow switch on a sprinkler system is typically connected to a fire alarm panel to produce which signal?

  1. A trouble signal
  2. A voice evacuation signal
  3. An alarm signal Correct answer.
  4. A supervisory signal

Explanation

Waterflow indicates that a sprinkler has discharged water, so it is treated as an alarm signal. Supervisory signals, by contrast, indicate an off-normal condition such as a closed valve.

Question 46Fire Alarm System Fundamentals and Design

A valve tamper switch on a sprinkler control valve normally reports which type of signal to the fire alarm control panel?

  1. Trouble
  2. Security
  3. Alarm
  4. Supervisory Correct answer.

Explanation

A valve tamper switch reports an off-normal valve position as a supervisory signal. This alerts building personnel that the sprinkler system may be impaired. It is not an alarm signal because water is not necessarily flowing.

Question 47Fire Alarm System Fundamentals and Design

Which statement describes a Class B initiating device circuit?

  1. It requires two independent paths to every device.
  2. It is permitted only for notification appliances.
  3. A single open causes trouble but not alarm. Correct answer.
  4. It survives a single open conductor and continues to operate.

Explanation

A Class B circuit is supervised but does not survive a single open conductor. An open causes a trouble signal, and devices beyond the open may not operate. Class A circuits are the ones designed to survive a single open.

Question 48Fire Alarm System Fundamentals and Design

On a smooth ceiling, spot-type smoke detectors must be located no more than what distance from a side wall?

  1. 5 ft (1.5 m)
  2. 15 ft (4.6 m)
  3. 21 ft (6.4 m) Correct answer.
  4. 10 ft (3.0 m)

Explanation

NFPA 72 requires spot-type smoke detectors to be no more than 21 ft from a side wall when using 30 ft spacing. This keeps the wall-to-detector distance within the detector's listed coverage.

Question 49Fire Alarm System Fundamentals and Design

Where should a duct smoke detector be installed in a supply air duct?

  1. Inside fan housing and after branches
  2. At outside air intake before filters
  3. Downstream of filters, before branches Correct answer.
  4. Upstream of filters and at return grille

Explanation

NFPA 72 requires duct smoke detectors in supply ducts to be located downstream of the air filters and ahead of any branch connections. This samples air after filtration and before it is distributed to multiple areas.

Question 50Fire Alarm System Fundamentals and Design

On elevator recall, which level is the primary recall floor?

  1. The floor with the machine room
  2. The basement level
  3. The designated level Correct answer.
  4. The highest floor served

Explanation

Primary elevator recall sends cars to the designated level, which is usually the ground or main entrance floor. If smoke is detected at the designated level, the system uses the alternate recall floor.