RCDD Chapter 14 Overhead Paging Systems (Non-core Areas)
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Questions and Answers
- 1.
What are the four major purposes for sound systems in cmommercial buildings?
- A.
Overhead paging
- B.
Life safety
- C.
Noise masking
- D.
Sound reinforcement
- E.
All the above
Correct Answer
E. All the aboveExplanation
The four major purposes for sound systems in commercial buildings are overhead paging, life safety, noise masking, and sound reinforcement. Overhead paging is used to make announcements and communicate with people throughout the building. Life safety involves using sound systems to provide emergency notifications and evacuation instructions in case of fire or other emergencies. Noise masking is used to reduce distractions and create a more comfortable environment by adding a low-level background sound. Sound reinforcement is used to amplify and distribute sound for presentations, meetings, and entertainment purposes. Therefore, the correct answer is "All the above."Rate this question:
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- 2.
Paging systems may be accessed from standard telephones, either with or without being connected to a telephone system, or from central office lines.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Paging systems can indeed be accessed from standard telephones, whether they are connected to a telephone system or not, as well as from central office lines. This means that individuals can use their regular telephones to access paging systems and make announcements or send messages. Therefore, the statement "Paging systems may be accessed from standard telephones, either with or without being connected to a telephone system, or from central office lines" is true.Rate this question:
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- 3.
What are the two main technologies employed in paging systems?
- A.
Centrally amplified systems
- B.
Alert or alarm tones
- C.
Distributed amplified systems
- D.
Group call
Correct Answer(s)
A. Centrally amplified systems
C. Distributed amplified systemsExplanation
The two main technologies employed in paging systems are centrally amplified systems and distributed amplified systems. Centrally amplified systems involve a central amplifier that provides power and amplification to multiple speakers or zones. This allows for a centralized control and management of the paging system. On the other hand, distributed amplified systems have amplifiers distributed throughout the system, providing power and amplification to individual speakers or zones. This allows for greater flexibility and scalability in the paging system, as each zone can be independently controlled and adjusted.Rate this question:
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- 4.
What are the two types of amplifiers and speakers that can be used in a centrally amplified system?
- A.
Centrally amplified
- B.
Constant current
- C.
Distributed amplified
- D.
Constant voltage
Correct Answer(s)
B. Constant current
D. Constant voltageExplanation
In a centrally amplified system, there are two types of amplifiers and speakers that can be used: constant current and constant voltage. Constant current amplifiers are designed to deliver a steady current to the speakers, regardless of the impedance variations. This type of amplifier is commonly used in distributed audio systems where long speaker wire runs are required. On the other hand, constant voltage amplifiers deliver a fixed voltage to the speakers, allowing multiple speakers to be connected in parallel. This type of amplifier is commonly used in public address systems and commercial installations where multiple speakers need to be distributed throughout a large area.Rate this question:
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- 5.
In both constant cuurent and constant voltage systems, the cable is usually ______ AWG 1.0 mm (.039 in) or , larger, and is often shielded to prevent emissions?
- A.
24 AWG
- B.
16 AWG
- C.
18 AWG
- D.
14 AWG
Correct Answer
C. 18 AWGExplanation
In both constant current and constant voltage systems, the cable is usually 18 AWG or larger, and is often shielded to prevent emissions. The American Wire Gauge (AWG) is a standardized wire gauge system used to determine the diameter of electrical wire. In this case, 18 AWG is the most suitable choice as it is thick enough to handle the current or voltage in the system and is commonly used in such applications. The shielding is also important to prevent electromagnetic interference or emissions that could disrupt other nearby electronic devices.Rate this question:
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- 6.
For design purposes, speakers are rated at a measured SPL at __________ from the speaker with _____ watt of power input?
- A.
1 m (3.3 ft), one watt
- B.
2 m (6.6 ft), two watt
- C.
3 m (10 ft), 3 watt
Correct Answer
A. 1 m (3.3 ft), one wattExplanation
Speakers are rated at a measured SPL (Sound Pressure Level) at a specific distance from the speaker and with a specific power input. In this case, the correct answer is 1 m (3.3 ft) and one watt. This means that the speaker's sound output is measured at a distance of 1 meter from the speaker, and the power input to the speaker is one watt. This rating helps designers and users understand the speaker's performance and determine its suitability for their intended use.Rate this question:
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- 7.
The power rule states that a doubling of the amount of power from the amplifier will cause the sound pressure level (SP) to increase by ______ db?
- A.
2
- B.
3
- C.
4
- D.
5
Correct Answer
B. 3Explanation
The power rule states that a doubling of the amount of power from the amplifier will cause the sound pressure level (SP) to increase by 3 dB. This means that if the power is increased by a factor of 2, the sound pressure level will increase by 3 dB.Rate this question:
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- 8.
During a jet airplane takeoff the db may exceed what?
- A.
200db
- B.
300db
- C.
400db
- D.
100db
Correct Answer
D. 100dbExplanation
During a jet airplane takeoff, the noise level may exceed 100db. Jet engines produce a significant amount of noise during takeoff due to the high power and speed involved. The noise generated can be measured in decibels (db), and it is common for jet airplane takeoffs to reach or exceed 100db.Rate this question:
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- 9.
In a Doctor's exam room the db may be?
- A.
55
- B.
45
- C.
25
- D.
65
Correct Answer
A. 55Explanation
The correct answer is 55 because the question is asking about the decibel level in a doctor's exam room. Typically, a doctor's exam room is a quiet environment where patients need to be able to hear the doctor clearly. Therefore, the decibel level would be relatively low, around 55 dB, to ensure a calm and peaceful atmosphere for both the doctor and the patient.Rate this question:
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- 10.
Levels above _____ dB are unsuitable for paging?
- A.
100 dB
- B.
95 dB
- C.
85 dB
- D.
75 dB
Correct Answer
B. 95 dBExplanation
Levels above 95 dB are unsuitable for paging because they can cause discomfort and potential damage to the human ear. The human threshold for pain is typically around 120 dB, so anything above 95 dB can be considered extremely loud. In a paging system, it is important to maintain a volume level that is clear and audible without causing harm to the listeners.Rate this question:
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- 11.
What are the two most common speaker distribution patterns used by designers?
- A.
Hexagonal
- B.
Triangle
- C.
Square
- D.
Rectangle
Correct Answer(s)
A. Hexagonal
C. SquareExplanation
The two most common speaker distribution patterns used by designers are hexagonal and square. Hexagonal distribution provides a more uniform sound coverage and minimizes dead zones, making it suitable for larger spaces. On the other hand, square distribution is commonly used in smaller rooms or home theaters, as it provides even sound distribution throughout the space. Both patterns offer their own advantages depending on the size and purpose of the room.Rate this question:
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- 12.
In areas with less that 70 dB noise level, the distance between ceiling speakers in a row whoud be approximately ________ the celing hight?
- A.
Twice
- B.
Quadruple
- C.
Three times
Correct Answer
A. TwiceExplanation
In areas with less than 70 dB noise level, the distance between ceiling speakers in a row should be approximately twice the ceiling height. This means that if the ceiling height is x, the distance between the speakers should be 2x. This ensures that the sound is evenly distributed throughout the area and provides optimal audio coverage.Rate this question:
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- 13.
For appropriate sound coverage, wall-mounted speakers should b mounted __________ above the floor?
- A.
2.4 to 3.7m (8 to 12 ft)
- B.
4.4 to 5.4 m (14 to 17 ft)
- C.
1.4 to 2.4 m (5 to 12 ft)
Correct Answer
A. 2.4 to 3.7m (8 to 12 ft)Explanation
Wall-mounted speakers should be mounted 2.4 to 3.7m (8 to 12 ft) above the floor to provide appropriate sound coverage. By mounting the speakers at this height, the sound can be evenly distributed throughout the room, reaching the listeners without obstruction. This height range also helps to prevent any interference or distortion caused by obstacles such as furniture or people in the room.Rate this question:
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- 14.
As a gereral rule, one speaker is required for every ________ of floor space?
- A.
56 m sq (600 ft sq)
- B.
54 m sq (500 ft sq)
- C.
58 m sq (600 ft sq)
- D.
56 m sq (500 ft sq)
Correct Answer
A. 56 m sq (600 ft sq)Explanation
As a general rule, one speaker is required for every 56 m sq (600 ft sq) of floor space. This means that for every 56 square meters or 600 square feet of floor space, one speaker should be installed.Rate this question:
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- 15.
The other Constant voltage system design is called what?
- A.
70 V system
- B.
40 V system
- C.
20 V system
- D.
25 V system
Correct Answer
D. 25 V systemExplanation
The other constant voltage system design is called the 25 V system.Rate this question:
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- 16.
In a constant voltage system design there are two systems typicall used. What is the most common called?
- A.
60 V system
- B.
20 V system
- C.
70 V system
- D.
40 V system
Correct Answer
C. 70 V systemExplanation
In a constant voltage system design, the most commonly used system is the 70 V system.Rate this question:
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- 17.
When the diaphragms are not moving inward or outward at the same time, this refers to what?
- A.
In-phase
- B.
Out-of-phase
Correct Answer
B. Out-of-phaseExplanation
When the diaphragms are not moving inward or outward at the same time, this refers to being out-of-phase. In-phase refers to the diaphragms moving in the same direction at the same time, while out-of-phase means that they are moving in opposite directions or at different times.Rate this question:
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- 18.
In ambient noise leverls above 100 dB, coded tones or strobe lights may provide an alternative to standard paging.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
In environments where the ambient noise levels exceed 100 dB, standard paging may not be effective. In such situations, coded tones or strobe lights can be used as an alternative to ensure that important messages are still communicated effectively. Therefore, the statement that coded tones or strobe lights may provide an alternative to standard paging in ambient noise levels above 100 dB is true.Rate this question:
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- 19.
Phasing refers to weather the diaphragms of _____ or more speakers are moving inward or outward at the same time.
- A.
Three
- B.
Two
- C.
Four
- D.
Five
Correct Answer
B. TwoExplanation
Phasing refers to whether the diaphragms of two or more speakers are moving inward or outward at the same time.Rate this question:
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- 20.
You shoud place the first bidirectional speaker 6 m (20 ft) from the end of the hall and work toward the other end.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The first bidirectional speaker should be placed 6 m (20 ft) from the end of the hall and then work towards the other end. This means that the speaker should be positioned closer to one end of the hall and then gradually move towards the other end. This arrangement allows for better sound distribution and coverage throughout the hall, ensuring that the sound reaches all areas evenly. Therefore, the statement is true.Rate this question:
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- 21.
Where ceiling speakers cannot be used, use wall-mounted bidirectional speakers placed at intervals of approximately ________ on alternation sides?
- A.
7 m (24 ft)
- B.
6 m (20 ft)
- C.
8 m (26 ft)
- D.
5 m (17 ft)
Correct Answer
C. 8 m (26 ft)Explanation
When ceiling speakers cannot be used, wall-mounted bidirectional speakers can be used instead. These speakers should be placed at intervals of approximately 8 meters (26 feet) on alternating sides. This spacing allows for even sound distribution and coverage in the area where ceiling speakers are not suitable.Rate this question:
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- 22.
For Heavy traffic hallways, use ceiling-mounted speakers placed along the center of the hallway at _________ intervals whenever possible?
- A.
3.4 m (11 ft)
- B.
2.4 m (8 ft)
- C.
4.4 m (14 ft)
- D.
1.4 m ( 5 ft)
Correct Answer
B. 2.4 m (8 ft)Explanation
Ceiling-mounted speakers placed along the center of the hallway at 2.4 m (8 ft) intervals are recommended for heavy traffic hallways. This spacing allows for even distribution of sound throughout the hallway, ensuring that the audio is audible to people walking in both directions. Placing the speakers too close together may result in overlapping sound, while placing them too far apart may create areas with inadequate sound coverage. Therefore, 2.4 m (8 ft) intervals strike a balance between providing sufficient sound coverage and avoiding sound overlap in heavy traffic hallways.Rate this question:
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- 23.
What are the three basic components in a distributed amplified system?
- A.
Speaker
- B.
Power supply
- C.
Amplifier
- D.
Control unit
Correct Answer(s)
A. Speaker
B. Power supply
D. Control unitExplanation
In a distributed amplified system, the three basic components are the speaker, power supply, and control unit. The speaker is responsible for producing sound output, the power supply provides the necessary electrical power to operate the system, and the control unit manages and regulates the functions of the system. These components work together to ensure proper amplification and distribution of audio signals in the system.Rate this question:
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