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質問 # 41
How often shall emergency egress and relocation drills in educational occupancies be conducted?
- A. Annually
- B. Monthly
- C. Every semester
- D. Weekly
正解：B
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Drill Frequency in Educational Occupancies:
Per NFPA 101 (Life Safety Code), Section 14.7.2, emergency egress and relocation drills in educational occupancies are required to be conducted monthly during the school year.
Purpose of Monthly Drills:
Frequent drills ensure students and staff are familiar with evacuation procedures, improving safety during actual emergencies.
Other Options Explained:
Option A (Weekly): Excessive and not required by NFPA 101.
Option C (Every semester): Insufficient frequency for maintaining readiness.
Option D (Annually): Not frequent enough for educational settings.
Summary:
Emergency egress and relocation drills in educational occupancies must be conducted monthly during the school year.
質問 # 42
What is the acceptable flow of water normally required for a pipe schedule sprinkler system that has a minimum pressure of 20 psi (14 bar) in an ordinary hazard occupancy?
- A. 700-1,000 gpm (2,650-3,785 L/min)
- B. 1,750-2,000 gpm (6,624-7,571 L/min)
- C. 500-750 gpm (1,893-2,839 L/min)
- D. 850-1,500 gpm (3,218-5,678 L/min)
正解：D
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Pipe Schedule Sprinkler Systems:
According to NFPA 13 (Standard for the Installation of Sprinkler Systems), Table 11.2.3.2.1, the required flow rate for ordinary hazard occupancies is typically 850-1,500 gpm (3,218-5,678 L/min) at a minimum pressure of 20 psi (14 bar).
Ordinary Hazard Occupancies:
These include areas with moderate fire loads, such as manufacturing spaces or storage areas, where a higher water flow is required compared to light hazard occupancies.
Other Options Explained:
Option A (500-750 gpm): Insufficient for ordinary hazard occupancies; more suited to light hazard classifications.
Option B (700-1,000 gpm): Too low for larger or higher-risk ordinary hazard areas.
Option D (1,750-2,000 gpm): Exceeds the typical requirement for ordinary hazards.
Summary:
The acceptable flow for a pipe schedule sprinkler system in an ordinary hazard occupancy is 850-1,500 gpm (3,218-5,678 L/min) at 20 psI .
質問 # 43
During an inspection, it is determined that the installation of a new suppression system is significantly different from the one approved during plans review. What action should be taken by the inspector?
- A. Issue a violation notice to the owner
- B. Indicate the modifications on the approved plan
- C. Evaluate the installation for compliance
- D. Require a submittal of a set of corrected plans
正解：D
解説：
When a significant deviation from the approved plans is discovered during an inspection, the appropriate action is to require a submittal of a set of corrected plans. This is necessary to ensure the system is reviewed and approved in compliance with the applicable codes and standards.
Issue a violation notice (A): While this may be a secondary step if the system does not meet code, it is not the first step when encountering unapproved changes.
Evaluate the installation for compliance (B): Inspectors cannot simply evaluate the installation without updated plans, as the plans serve as the approved baseline for design compliance.
Require corrected plans (C): This step ensures that the new design is documented, reviewed, and approved before proceeding. It maintains compliance with NFPA standards.
Indicate modifications on the approved plan (D): Altering plans without proper review is not acceptable and does not ensure the system meets the original intent.
Reference:
NFPA 1 and NFPA 13: Systems must comply with approved designs and significant changes require resubmittal for review.
質問 # 44
Which of the following may initiate a fire alarm system?
I . A manual fire alarm
II . An automatic detector
III . An extinguishing system
- A. I and III
- B. I, II, and III
- C. I and II
- D. II and III
正解：B
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Fire Alarm System Initiation:
Fire alarm systems can be initiated through multiple methods as per NFPA 72 (National Fire Alarm and Signaling Code), Chapter 17:
Manual Fire Alarm (I): Initiated by individuals using manual pull stations.
Automatic Detector (II): Initiated by devices like smoke detectors, heat detectors, or flame detectors.
Extinguishing System (III): Automatic suppression systems (e.g., sprinklers) can activate the fire alarm when they discharge.
Why All Three Are Valid:
Manual alarms allow for immediate activation.
Automatic detectors provide early warning.
Extinguishing systems ensure fire alarm activation during suppression.
Other Options Explained:
Option A (I and II): Excludes extinguishing systems, which can also initiate alarms.
Option B (I and III): Excludes automatic detectors, a common initiation method.
Option D (II and III): Excludes manual fire alarms.
Summary:
All three-manual fire alarms, automatic detectors, and extinguishing systems-can initiate a fire alarm system. The correct answer is I, II, and III .
質問 # 45
What is the maximum length of dead-end corridors in new mercantile occupancies protected by a supervised automatic sprinkler system?
- A. 75 ft (23 m)
- B. 20 ft (6 m)
- C. 100 ft (30 m)
- D. 50 ft (15 m)
正解：A
解説：
Dead-end corridors are portions of a hallway that do not lead to an exit, posing challenges for occupant evacuation during a fire. According to NFPA 101, Life Safety Code, Section 36.2.5.2 (New Mercantile Occupancies):
In buildings equipped with a supervised automatic sprinkler system, the maximum allowable length of a dead-end corridor is 75 feet (23 meters).
Without a sprinkler system, the limit is typically much shorter, such as 20 feet (6 meters) or 50 feet (15 meters) depending on occupancy type.
20 ft (A) and 50 ft (B): These limits apply to unsprinklered or higher-risk occupancies.
100 ft (D): This exceeds the allowable limit, even with sprinklers.
Reference:
NFPA 101, Section 36.2.5.2: Dead-end corridor limits for mercantile occupancies
質問 # 46
Which of the following is true regarding the copy of an issued permit?
- A. It shall be reissued upon completion of the project.
- B. It shall be transferable to a new address.
- C. It shall be readily accessible at each place of operation.
- D. It shall be maintained by the architect of record.
正解：C
解説：
Permits are required to document authorization for specific fire protection and safety activities. According to NFPA 1, Fire Code, and general permit guidelines:
Issued permits must be readily accessible at the location of the operation to ensure:
Inspectors can verify compliance with the permit requirements.
The permit holder demonstrates authorization for ongoing work.
Reissuing a permit after completion of a project (B) is not standard practice.
Permits are not the responsibility of architects (C) unless they are the permit holder.
Permits are generally non-transferable (D) because they are site-specific and operation-specific.
Reference:
NFPA 1, Fire Code, Section 1.12.13: Permit requirements for accessibility and non-transferability.
質問 # 47
What is a system that discharges water from open sprinklers activated by a detection system called?
- A. Dry-pipe system
- B. Preaction system
- C. Wet-pipe system
- D. Deluge system
正解：D
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Deluge Systems:
A deluge system is a fire sprinkler system in which all sprinklers are open, and water is discharged simultaneously when activated by a separate detection system (e.g., heat or smoke detection).
Key Characteristics of a Deluge System:
Sprinkler heads are open, with no heat-sensitive element.
The piping is not pressurized with water until the detection system activates the deluge valve.
Commonly used in high-hazard areas like aircraft hangars or flammable liquid storage facilities.
Other Options Explained:
Option A (Wet-pipe system): Pipes are filled with water, and only heat-activated sprinklers discharge water.
Option B (Dry-pipe system): Pipes contain air or nitrogen; water enters after a sprinkler activates.
Option C (Preaction system): Combines elements of dry-pipe and detection systems but does not discharge from all open sprinklers.
Summary:
A deluge system discharges water from open sprinklers activated by a detection system.
質問 # 48
How often must a hose valve on a hose station attached to a sprinkler system and Class II standpipe system be tested?
- A. Every year
- B. Every four years
- C. Every two years
- D. Every three years
正解：A
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Testing Requirements for Hose Valves:
Hose valves in Class II standpipe systems and sprinkler systems are critical components for fire protection.
NFPA 25 (Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems), Section 6.3.1 requires hose valves to be tested annually to ensure proper operation and water flow.
Why Annual Testing is Required:
Regular testing ensures the valves function correctly in case of an emergency.
Annual testing helps identify potential issues such as leaks, corrosion, or improper operation.
Other Options Explained:
Option B (Every two years), Option C (Every three years), Option D (Every four years):
These frequencies do not meet the minimum requirements stated in NFPA 25 for hose valves on standpipe and sprinkler systems.
Summary:
Hose valves on a Class II standpipe system and sprinkler systems must be tested annually per NFPA 25 to ensure operational readiness.
質問 # 49
Smoking is prohibited within what minimum distance from an outdoor hazardous material storage facility or dispensing area?
- A. 10 ft (3.4 m)
- B. 25 ft (7.6 m)
- C. 50 ft (15.2 m)
- D. 100 ft (30.4 m)
正解：C
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Smoking Prohibition Near Hazardous Materials:
According to NFPA 1 (Fire Code), Section 60.5.2.3, smoking is prohibited within a minimum of 50 feet (15.2 m) from outdoor hazardous material storage facilities or dispensing areas to reduce fire risks from ignition sources.
Why 50 Feet is Required:
Hazardous materials can release flammable vapors that ignite easily. The 50-foot distance ensures safety by minimizing the risk of exposure to open flames or sparks.
Other Options Explained:
Option A (10 ft) and Option B (25 ft): Too close to ensure safety.
Option D (100 ft): More than required under NFPA 1.
Summary:
Smoking is prohibited within 50 feet (15.2 m) of outdoor hazardous material storage or dispensing areas.
質問 # 50
A highly volatile liquid is best described as having a boiling point of
- A. 70°F (21°C)
- B. Greater than 212°F (100°C)
- C. Less than 68°F (20°C)
- D. 100°F (38°C)
正解：C
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Definition of Highly Volatile Liquids:
A highly volatile liquid is defined as a liquid with a low boiling point, meaning it evaporates quickly and can create hazardous vapor concentrations.
Per NFPA 30 (Flammable and Combustible Liquids Code):
Liquids with a boiling point below 68°F (20°C) are considered highly volatile.
Why 68°F (20°C) Matters:
Liquids with such a low boiling point vaporize readily at room temperature, posing significant fire and explosion hazards.
Other Options Explained:
Option B (70°F), Option C (100°F), and Option D (Greater than 212°F):
These values correspond to less volatile or moderately volatile liquids.
Summary:
A highly volatile liquid is one with a boiling point less than 68°F (20°C) due to its rapid evaporation and fire risk.
質問 # 51
How often are fire drills required for each shift of an acute care hospital?
- A. Monthly
- B. Quarterly
- C. Annually
- D. Semiannually
正解：B
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Fire Drills in Health Care Facilities:
According to NFPA 101 (Life Safety Code), Section 19.7.1.6, fire drills in acute care hospitals must be conducted quarterly on each shift.
This ensures staff on all shifts are prepared to respond appropriately in an emergency.
Why Quarterly is Required:
Regular drills help reinforce response protocols and ensure compliance with fire safety standards.
Other Options Explained:
Option A (Monthly): Exceeds the minimum requirement of quarterly drills.
Option C (Semiannually) and Option D (Annually): Insufficient to meet the requirements for high-risk environments like hospitals.
Summary:
Fire drills in acute care hospitals must be conducted quarterly for each shift to ensure readiness and compliance.
質問 # 52
When may acoustical and decorative materials such as cotton, hay, paper, straw, moss, split bamboo, and wood chips be used as decorations within an assembly occupancy?
- A. When they meet independent third-party certification
- B. When flame-retardant treated to the satisfaction of the AHJ
- C. Materials not permitted
- D. When small quantities are used
正解：B
解説：
Acoustical and decorative materials pose a significant fire hazard due to their combustibility. According to NFPA 101, Life Safety Code, Section 10.3.1, and related standards:
Such materials may only be used if they are flame-retardant treated or inherently noncombustible.
The treatment must be to the satisfaction of the Authority Having Jurisdiction (AHJ), ensuring compliance with testing requirements (e.g., NFPA 701).
Small quantities (B): Even small quantities can pose risks, so this is insufficient justification.
Third-party certification (C): While helpful, AHJ approval is still required.
Reference:
NFPA 101, Section 10.3.1: Requirements for interior finishes, decorations, and trim.
NFPA 701: Testing standards for flame retardancy of textiles and materials.
質問 # 53
A permit shall be required to store more than how many tires outside?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
解説：
The outdoor storage of tires is regulated because tires pose significant fire hazards due to their combustibility and difficulty in extinguishment. According to NFPA 1, Fire Code, Section 19.2.2:
Storage of more than 400 tires outdoors requires a permit.
This threshold ensures that large quantities of tires are managed under specific fire safety requirements, such as spacing, clearance, and firefighting access.
Tires can generate intense heat, dense smoke, and toxic gases when burning, requiring careful oversight.
Storage quantities below 400 tires may not require a permit but still must adhere to basic safety practices.
Reference:
NFPA 1, Fire Code, Section 19.2.2: Tire storage and fire safety permit thresholds.
質問 # 54
The acceptance of a permit as defined in the fire code gives the authority having jurisdiction the right to enter the premises to inspect
- A. at reasonable times.
- B. on a quarterly cycle.
- C. with the permission of the owner.
- D. at any time.
正解：A
解説：
The right of entry for inspections is governed by NFPA 1, Fire Code:
The Authority Having Jurisdiction (AHJ) is granted the right to enter and inspect premises at reasonable times to ensure compliance with the conditions of the permit and fire safety regulations.
The term "reasonable times" ensures that inspections are conducted without causing unnecessary disruption to occupants or operations.
"With the permission of the owner" (A) is not required under the fire code since permits inherently authorize inspection.
Quarterly cycle (B) is not defined in the fire code and depends on the nature of the permit.
At any time (D) would be unreasonable unless immediate danger is suspected.
Reference:
NFPA 1, Section 1.7.7: Right of entry for fire inspections.
質問 # 55
What is the required interior finish for the exits in a new educational building not protected by an automatic sprinkler system?
- A. Class C
- B. Class B
- C. Class A, B, or C
- D. Class A
正解：D
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Interior Finish Ratings:
Interior finishes are rated based on flame spread and smoke development using NFPA 101 (Life Safety Code) standards:
Class A: Flame Spread 0-25 (Low flame spread).
Class B: Flame Spread 26-75 (Moderate flame spread).
Class C: Flame Spread 76-200 (Higher flame spread).
Educational Occupancies:
In new educational occupancies (e.g., schools), special attention is given to exit pathways because they are critical for safe egress during emergencies.
When a building is not protected by an automatic sprinkler system, stricter requirements apply.
Per NFPA 101, Section 14.3.3.2 (Interior Wall and Ceiling Finish), the required finish for exit enclosures is Class A.
Why Class A is Required:
Class A ensures the least flame spread and provides the highest level of fire resistance.
Exits are life-critical pathways, so the material must offer superior fire performance to ensure safe evacuation.
Other Options Explained:
Option B (Class B): Allowed in some less critical areas but not for exits in unsprinklered educational occupancies.
Option C (Class C): Permitted only in less critical areas like corridors, provided there are fire protection measures.
Option D (Class A, B, or C): Incorrect because Class A is specifically required for exits when sprinklers are absent.
Summary:
In new educational buildings without an automatic sprinkler system, Class A interior finish is required for exit enclosures to maximize safety and fire resistance.
質問 # 56
Emergency shutoff valves and internal valves that are fitted for remote closure for LP-Gas vehicle fuel dispensing shall be tested for proper operation at what interval?
- A. Monthly
- B. Quarterly
- C. Annually
- D. Biennially
正解：C
解説：
Testing intervals for emergency shutoff valves and internal valves are specified in NFPA 58, Liquefied Petroleum Gas Code.
Annually (C): Proper operation of emergency shutoff and remote closure valves must be tested at least once per year to ensure functionality during emergencies.
Monthly (A) and Quarterly (B): More frequent testing is not required by NFPA 58 for these valves.
Biennially (D): Testing every two years exceeds the allowable interval.
Reference:
NFPA 58, Section 6.14.3: Maintenance and testing requirements for LP-Gas valves.
質問 # 57
Which of the following requires an emergency plan?
- A. A grocery store
- B. A two-story office building
- C. A special amusement building
- D. A three-story parking garage
正解：C
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Emergency Plan Requirements:
According to NFPA 101 (Life Safety Code), Section 12.4.1, special occupancies like special amusement buildings are required to have an emergency plan due to their unique fire hazards, including lighting effects, confined pathways, and high fire risk.
Why Special Amusement Buildings Need a Plan:
These structures often have complex layouts and unique hazards, increasing the need for a clear and practiced emergency plan.
Other Options Explained:
Option A (Parking garage): Typically does not require an emergency plan unless additional hazards exist.
Option B (Grocery store): Emergency plans are usually required for larger assembly or high-risk occupancies.
Option C (Two-story office building): Generally does not require an emergency plan unless it exceeds occupancy thresholds.
Summary:
A special amusement building requires an emergency plan due to its unique fire and egress hazards.
質問 # 58
Prior to seeking system acceptance for a sprinkler installation, an installer shall do which of the following?
I . Perform all required acceptance tests
II . Complete all contractors' material and test certificates
III . Notify the AHJ of the time and date of the test
IV . Complete owners' approval form and forward it to the AHJ
- A. I and IV
- B. III and IV
- C. II, III, and IV
- D. I, II, and III
正解：D
解説：
Before seeking system acceptance for a sprinkler installation, the installer must complete specific steps to comply with NFPA 13, Standard for the Installation of Sprinkler Systems:
Perform all required acceptance tests (I): Ensures the system functions as designed.
Complete contractors' material and test certificates (II): Certifies that the materials and testing meet NFPA standards.
Notify the AHJ (III): Ensures the AHJ can witness the tests and validate compliance.
The owner's approval form (IV) is not an NFPA requirement for acceptance testing.
Reference:
NFPA 13, Chapter 24: Requirements for acceptance testing.
質問 # 59
A high-hazard occupancy less than 200 ft² (18.6 m) in size, and with an occupant load not exceeding three, requires a second means of egress when the travel distance is greater than:
- A. 20 ft (6 m)
- B. 10 ft (3 m)
- C. 15 ft (4.5 m)
- D. 25 ft (7.6 m)
正解：A
解説：
According to NFPA 101, Life Safety Code, Section 7.4.1, travel distance requirements determine when a second means of egress is necessary for small high-hazard occupancies:
For high-hazard occupancies less than 200 ft² with an occupant load of 3 or fewer, a second means of egress is required if the travel distance exceeds 20 ft (6 m).
This distance allows safe evacuation while minimizing exposure to hazardous conditions.
10 ft (A) and 15 ft (B): These distances are too restrictive based on NFPA 101.
25 ft (D): This exceeds the allowable limit.
Reference:
NFPA 101, Section 7.4.1: Means of egress requirements for small high-hazard occupancies.
質問 # 60
Where is the evacuation and relocation plan maintained in existing health care occupancies?
- A. In the local fire department's dispatch center
- B. In the hospital administrator's office
- C. In the building manager's office
- D. In the facility's telephone operator's location or in the security center
正解：D
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Evacuation and Relocation Plans:
According to NFPA 101 (Life Safety Code), Section 18.7.2.2, for existing health care occupancies, the evacuation and relocation plan must be readily accessible and maintained in a location where it can be quickly referenced during an emergency.
Specific Locations:
The facility's telephone operator's location or the security center is ideal because:
These areas are staffed continuously.
Personnel in these locations can coordinate emergency responses quickly.
Other Options Explained:
Option A (In the building manager's office): Typically not staffed 24/7, and the plan may not be accessible during an emergency.
Option B (Local fire department's dispatch center): While helpful, the plan must be maintained onsite for immediate use.
Option D (Hospital administrator's office): This location is less practical during emergencies.
Summary:
The evacuation and relocation plan in existing health care occupancies must be maintained in the facility's telephone operator's location or security center for quick access during emergencies.
質問 # 61
How long should records of inspections be maintained?
- A. As long as the facility is occupied by the same individual or entity
- B. As long as the facility or building remains in the jurisdiction
- C. Until the violations detected during the inspection are corrected
- D. Until the usefulness of the record has been served
正解：B
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Retention of Inspection Records:
Per NFPA 1 (Fire Code), Section 1.7.4.3, inspection records must be maintained for as long as the facility or building remains in the jurisdiction.
This ensures historical data and accountability are available for review during subsequent inspections, audits, or legal matters.
Why "As Long as the Facility Remains" is Required:
Maintaining records ensures compliance verification, tracks violations, and provides a reference for future inspectors or AHJs.
Other Options Explained:
Option A: Subjective and does not align with code requirements.
Option B: Violations may be corrected, but records must still be maintained.
Option C: Occupancy changes do not nullify the need for record retention.
Summary:
Inspection records must be maintained as long as the facility or building remains in the jurisdiction to comply with NFPA requirements.
質問 # 62
Which one of the following is a primary reason for issuing a permit?
- A. To make the jurisdiction aware of potentially hazardous situations or conditions
- B. To establish the economic feasibility of a project
- C. To allow the requester to meet less restrictive code requirements
- D. To meet fire insurance requirements
正解：A
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Purpose of Permits:
Permits are issued primarily to ensure the jurisdiction (Authority Having Jurisdiction - AHJ) is aware of potentially hazardous situations or conditions and can enforce compliance with fire and safety codes.
Permits also provide an opportunity to inspect operations, processes, or structures to ensure safety.
NFPA References:
According to NFPA 1 (Fire Code), permits are required for activities that could pose risks, such as hazardous materials, fire protection system installations, and occupancy changes.
Other Options Explained:
Option A (To meet fire insurance requirements): Permits are not issued for insurance purposes, although compliance may indirectly affect insurance.
Option C (Less restrictive code requirements): Permits are not for bypassing codes.
Option D (Economic feasibility): Economic factors are unrelated to the permitting process.
Summary:
Permits are issued to make the jurisdiction aware of potentially hazardous situations or conditions and ensure compliance with fire safety regulations.
質問 # 63
What is the minimum required total stair width in a non-sprinklered hotel with an occupancy capacity of 650?
- A. 130 in. (3,302 mm)
- B. 455 in. (11,557 mm)
- C. 217 in. (5,512 mm)
- D. 195 in. (4,953 mm)
正解：D
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Egress Width Calculation:
According to NFPA 101 (Life Safety Code), Section 7.3.3.1, for non-sprinklered occupancies, the required stair width is 0.3 inches per occupant.
Calculation:
Occupancy capacity = 650 people
Required stair width = 0.3in.×650=195inches0.3 \, \text{in.} \times 650 = 195 \, \text{inches}0.3in.×650=195inches.
Other Options Explained:
Option A (130 in): Too small for 650 occupants.
Option C (217 in): Exceeds the requirement.
Option D (455 in): Far exceeds the requirement.
Summary:
The minimum required total stair width for a non-sprinklered hotel with an occupancy capacity of 650 is 195 inches.
質問 # 64
What class of organic peroxide burns rapidly and presents a moderate reactivity hazard?
- A. Class I
- B. Class II
- C. Class III
- D. Class IV
正解：B
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Organic Peroxides:
Organic peroxides are highly reactive chemicals that can burn rapidly or decompose, presenting significant fire and explosion hazards.
They are classified into classes based on their burning rate and reactivity hazard according to NFPA 400 (Hazardous Materials Code).
Class II Organic Peroxides:
Class II organic peroxides are characterized by:
Burning rapidly.
Presenting a moderate reactivity hazard.
They are less hazardous than Class I but still require precautions during storage and handling.
Other Options Explained:
Option A (Class I): Extremely hazardous; burns rapidly with high reactivity.
Option C (Class III): Burns moderately and has a lower reactivity hazard.
Option D (Class IV): Burns slowly with minimal reactivity hazard.
Summary:
A Class II organic peroxide burns rapidly and presents a moderate reactivity hazard as defined by NFPA 400.
質問 # 65
What is the minimum diameter allowed for piping serving fire hydrants on private fire service mains?
- A. 8 in. (203.2 mm)
- B. 10 in. (254 mm)
- C. 4 in. (101.6 mm)
- D. 6 in. (152.4 mm)
正解：D
解説：
Comprehensive and Detailed Step-by-Step Explanation:
Fire Hydrant Piping Diameter:
Per NFPA 24 (Standard for the Installation of Private Fire Service Mains and Their Appurtenances), Section 5.2.1, the minimum diameter for piping serving fire hydrants on private fire service mains is 6 inches (152.4 mm).
Why 6 Inches is Required:
A minimum 6-inch pipe ensures sufficient water flow and pressure to meet firefighting demands.
Other Options Explained:
Option A (4 in): Too small; insufficient for hydrant water supply.
Option C (8 in) and Option D (10 in): Acceptable but exceed the minimum requirement.
Summary:
The minimum diameter for piping serving fire hydrants on private fire service mains is 6 inches (152.4 mm).
質問 # 66
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