RCDD Chapter 14

1. What are the four major purposes for sound systems in cmommercial buildings?

Overhead paging

Life safety

Noise masking

Sound reinforcement

All the above

2. In ambient noise leverls above 100 dB, coded tones or strobe lights may provide an alternative to standard paging.

True

False

3. For appropriate sound coverage, wall-mounted speakers should b mounted __________ above the floor?

2.4 to 3.7m (8 to 12 ft)

4.4 to 5.4 m (14 to 17 ft)

1.4 to 2.4 m (5 to 12 ft)

4. Phasing refers to weather the diaphragms of _____ or more speakers are moving inward or outward at the same time.

Three

Two

Four

Five

5. What are the two main technologies employed in paging systems?

Centrally amplified systems

Alert or alarm tones

Distributed amplified systems

Group call

Submit

6. You shoud place the first bidirectional speaker 6 m (20 ft) from the end of the hall and work toward the other end.

True

False

7. Paging systems may be accessed from standard telephones, either with or without being connected to a telephone system, or from central office lines.

True

False

8. For design purposes, speakers are rated at a measured SPL at ______ from the speaker with _ watt of power input?

1 m (3.3 ft), one watt

2 m (6.6 ft), two watt

3 m (10 ft), 3 watt

9. In areas with less that 70 dB noise level, the distance between ceiling speakers in a row whoud be approximately ________ the celing hight?

Twice

Quadruple

Three times

10. 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?

2

3

4

5

11. When the diaphragms are not moving inward or outward at the same time, this refers to what?

In-phase

Out-of-phase

12. What are the two types of amplifiers and speakers that can be used in a centrally amplified system?

Centrally amplified

Constant current

Distributed amplified

Constant voltage

Submit

13. In a constant voltage system design there are two systems typicall used. What is the most common called?

60 V system

20 V system

70 V system

40 V system

14. For Heavy traffic hallways, use ceiling-mounted speakers placed along the center of the hallway at _________ intervals whenever possible?

3.4 m (11 ft)

2.4 m (8 ft)

4.4 m (14 ft)

1.4 m ( 5 ft)

15. What are the two most common speaker distribution patterns used by designers?

Hexagonal

Triangle

Square

Rectangle

Submit

16. The other Constant voltage system design is called what?

70 V system

40 V system

20 V system

25 V system

17. Levels above _____ dB are unsuitable for paging?

100 dB

95 dB

85 dB

75 dB

18. In a Doctor's exam room the db may be?

55

45

25

65

19. Where ceiling speakers cannot be used, use wall-mounted bidirectional speakers placed at intervals of approximately ________ on alternation sides?

7 m (24 ft)

6 m (20 ft)

8 m (26 ft)

5 m (17 ft)

20. What are the three basic components in a distributed amplified system?

Speaker

Power supply

Amplifier

Control unit

Submit

RCDD Chapter 14

1. What are the four major purposes for sound systems in cmommercial buildings?

2.

What first name or nickname would you like us to use?

2. In ambient noise leverls above 100 dB, coded tones or strobe lights may provide an alternative to standard paging.

3. For appropriate sound coverage, wall-mounted speakers should b mounted __________ above the floor?

4. Phasing refers to weather the diaphragms of _____ or more speakers are moving inward or outward at the same time.

5. What are the two main technologies employed in paging systems?

6. You shoud place the first bidirectional speaker 6 m (20 ft) from the end of the hall and work toward the other end.

7. Paging systems may be accessed from standard telephones, either with or without being connected to a telephone system, or from central office lines.

8. For design purposes, speakers are rated at a measured SPL at __________ from the speaker with _____ watt of power input?

9. In areas with less that 70 dB noise level, the distance between ceiling speakers in a row whoud be approximately ________ the celing hight?

10. 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?

11. When the diaphragms are not moving inward or outward at the same time, this refers to what?

12. What are the two types of amplifiers and speakers that can be used in a centrally amplified system?

13. In a constant voltage system design there are two systems typicall used. What is the most common called?

14. For Heavy traffic hallways, use ceiling-mounted speakers placed along the center of the hallway at _________ intervals whenever possible?

15. What are the two most common speaker distribution patterns used by designers?

16. The other Constant voltage system design is called what?

17. Levels above _____ dB are unsuitable for paging?

18. In a Doctor's exam room the db may be?

19. Where ceiling speakers cannot be used, use wall-mounted bidirectional speakers placed at intervals of approximately ________ on alternation sides?

20. What are the three basic components in a distributed amplified system?

8. For design purposes, speakers are rated at a measured SPL at ______ from the speaker with _ watt of power input?