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NEW QUESTION # 14
What is the maximum permitted height for stored Class 2 oxidizers in a nonsprinklered retail sales area that is open to the public?
Answer: C
Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
Storage of Class 2 Oxidizers:
Per NFPA 430 (Code for the Storage of Liquid and Solid Oxidizers), Section 6.3.4, in nonsprinklered retail sales areas open to the public, Class 2 oxidizers must not be stored at heights exceeding 5 feet (1.5 meters).
Why 5 Feet is the Limit:
Limiting the height reduces the risk of spills, accidental damage, and fire spread in a retail environment.
Other Options Explained:
Option A (3 ft): Too restrictive; NFPA allows up to 5 ft.
Option C (6 ft) and Option D (12 ft): Exceed the maximum permitted height for nonsprinklered areas.
Summary:
The maximum height for stored Class 2 oxidizers in a nonsprinklered retail area open to the public is 5 feet (1.5 meters).
NEW QUESTION # 15
Spray undercoating or spray body lining of vehicles shall be conducted a minimum of what distance from open flames or spark-producing equipment?
Answer: A
Explanation:
The minimum distance required for spray undercoating or spray body lining of vehicles from open flames or spark-producing equipment is specified in NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials.
Spraying operations involving combustible coatings pose a significant fire risk due to flammable vapors, which can ignite from open flames or sparks.
To ensure safety, these operations must be conducted at least 20 feet (6,100 mm) away from ignition sources, as vapors can travel and accumulate in the surrounding air.
3 ft (914 mm) (A) and 5 ft (1,524 mm) (B) are insufficient to prevent ignition.
10 ft (3,048 mm) (C) may be acceptable for certain low-risk operations but does not meet the requirements for vehicle spray applications.
Reference:
NFPA 33, Section 9.3: Minimum distance from open flames and spark-producing equipment.
NEW QUESTION # 16
New underground and limited access structures require an approved, supervised, automatic sprinkler system, when the occupant load meets or exceeds how many people?
Answer: D
Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
Sprinkler System Requirement:
According to NFPA 101 (Life Safety Code), Section 11.8, new underground and limited-access structures with an occupant load of 20 or more people are required to have an approved, supervised automatic sprinkler system.
Why 20 People is the Threshold:
Underground and limited-access structures pose unique fire and life safety challenges due to restricted egress and ventilation.
Automatic sprinkler systems mitigate fire hazards by controlling or suppressing the fire, allowing time for evacuation.
Other Options Explained:
Option A (10 people): Not the specified threshold.
Option C (40 people) and Option D (50 people): Too high; NFPA sets the limit at 20 people for these structures.
Summary:
An automatic sprinkler system is required when the occupant load in new underground or limited-access structures meets or exceeds 20 people.
NEW QUESTION # 17
Which of the following systems has a quick-opening device?
Answer: B
Explanation:
Comprehensive and Detailed Step-by-Step Explanation:
Quick-Opening Devices:
A quick-opening device is used in dry-pipe sprinkler systems to accelerate the operation of the system and reduce the delay caused by air in the pipes.
Why Dry-Pipe Systems Use It:
Dry-pipe systems are filled with air or nitrogen instead of water. When a sprinkler activates, the air must be released before water can flow.
Quick-opening devices, like accelerators or exhausters, speed up the release of air to minimize response time.
Other Options Explained:
Option B (Wet-pipe system): Always filled with water; no delay or need for quick-opening devices.
Option C (Preaction system): Uses air but often requires detection activation, not quick-opening devices.
Option D (Deluge system): Opens immediately but does not require quick-opening devices as pipes are already open.
Summary:
A dry-pipe system uses a quick-opening device to reduce activation delays caused by air in the pipes.
NEW QUESTION # 18
What class of organic peroxide burns rapidly and presents a moderate reactivity hazard?
Answer: C
Explanation:
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.
NEW QUESTION # 19
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