RCDD Chapter 14
RCDD chapter 14
- 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 above -
- 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. True -
- 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 systems -
- 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 voltage -
- 5.
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 watt -
- 6.
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. 3 -
- 7.
In a Doctor's exam room the db may be?
- A.
55
- B.
45
- C.
25
- D.
65
Correct Answer
A. 55 -
- 8.
Levels above _____ dB are unsuitable for paging?
- A.
100 dB
- B.
95 dB
- C.
85 dB
- D.
75 dB
Correct Answer
B. 95 dB -
- 9.
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. Square -
- 10.
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. Twice -
- 11.
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) -
- 12.
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) -
- 13.
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) -
- 14.
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. True -
- 15.
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. True -
- 16.
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. Two -
- 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-phase -
- 18.
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 system -
- 19.
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 system -
- 20.
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 unit -
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Mar 21, 2022Quiz Edited by
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