RCDD TEST QUESTIONS (TOPIC 15 - TOPIC 21) WITH SOLVED SOLUTIONS.

RCDD TEST QUESTIONS (TOPIC 15 - TOPIC 21) WITH SOLVED SOLUTIONS. What is the recommended distance between ceiling mounted speakers in a hallway with heavy traffic? A. 2.4 m (8 ft) B. 3.7 m (12 ft) C. 4.9 m (16 ft) D. 6 m (20 ft) A. 2.4 m (8 ft) A space has all hard surfaces including architecture and furnishings. The audio programming produced from the distributed sound system has become unintelligible. Which of the following will NOT mitigate the problem? A. Add tapestries to the walls. B. Provide additional speakers at lower output. C. Increase the volume to the existing speakers. D. Reduce the distance of the existing speakers to the listener. C. Increase the volume to the existing speakers. What are the three typical voltages used in centrally amplified paging systems? A. 24, 48, and 90 B. 25, 70, and 100 C. 25, 90, and 120 D. 48, 90, and 120 B. 25, 70, and 100 Using the sound pressure level (SPL) method of approximating distance and power, calculate the power required to produce 89 dB at 4 m (13.1 ft) with a loud speaker that is rated at a SPL of 95 dB. What input power level (in watts) is required to appropriately power the speaker? A. 1 watt B. 2 watts C. 4 watts D. 8 watts C. 4 watts You are designing a paging system for a 588 sq m (6325 sq ft) open office space. Due to architectural features of the ceiling, wall mounted speakers must be used. Following the general rule about wall mounted speaker placement, how many speakers should be installed? A. Eight B. Ten C. Twelve D. Fourteen C. Twelve What is the highest typical ambient noise level where audio paging becomes unintelligible? A. 75 dB B. 85 dB C. 95 dB D. 105 dB C. 95 dB What element is typically NOT part of a paging system? A. Strobe B. Distribution C. Amplification D. Loudspeakers A. Strobe You are designing a four story retail mall and multiple sound systems within it. Which system should you design to support general music programming within common retail areas? A. Distributed paging B. Life safety C. Sound masking D. Sound reinforcement and playback D. Sound reinforcement and playback A properly designed distributed paging system will provide a sound pressure level (SPL) for audio paging that is between ________ above ambient noise level. A. 3 dB and 6 dB B. 6 dB and 10 dB C. 10 dB and 20 dB D. 20 dB and 55 dB C. 10 dB and 20 dB In a hallway with normal traffic, ceiling mounted speakers should be placed ________ times the corridor height, minus the ________. A. Two; average height of listener's ear B. Two; width of corridor C. Three; average height of listener's ear D. Three width of corridor A. Two; average height of listener's ear You are designing a restaurant located within a retail mall. The ambient noise level of the restaurant is 70 dB. The ambient noise level of the mall common space is 75 dB. What is the MINIMUM sound pressure level (SPL) that should be used when designing the paging system within the restaurant? A. 70 dB B. 75 dB C. 80 dB D. 85 dB C. 80 dB For design purposes, loudspeakers are rated for a measured sound pressure level (SPL) at: A. 1 m (3.3 ft) from the loudspeaker with 1 watt of power input B. 1 m (3.3 ft) from the loudspeaker with 2 watts of power input C. 3 m (10 ft) from the loudspeaker with 1 watt of power input D. 3 m (10 ft) from the loudspeaker with 2 watts of power input A. 1 m (3.3 ft) from the loudspeaker with 1 watt of power input Within a commercial office building of 2300 sq m (25000 sq ft), how many building automation system (BAS) devices are required? A. 50 B. 75 C. 100 D. 125 E. 150 C. 100 Which of the following protocols is referred to under ISO 16484-5? A. BACnet B. ARCnet C. European installation bus D. EMSLan E. LonMark A. BACnet What type of facility requires a building automation system (BAS) device to be located every 5 sq m (50 sq ft)? A. Hotel guest room B. Education classroom C. Hospital D. Mechanical room E. Factory D. Mechanical room What is the expected lumenance value, in watts, of a 200 watt fluorescent lamp after three years? A. 120 watts B. 140 watts C. 160 watts D. 180 watts E. 200 watts B. 140 watts What is the expected life cycle, in years, of building automation system within a building structure with a life cycle of 40+ years? A. 1 to 2 B. 2 to 4 C. 5 to 7 D. 8 to 12 E. 12 to 15 C. 5 to 7 Within a heating ventilation and air conditioning automatic control system, what do the letters DDC stand for? A. Dual division charger B. Direct digital control C. Diverse duct center D. Direct drive cable E. Differential diffuser control B. Direct digital control If you are using a building automation system (BAS) protocol operating on RF media at19,200 b/s in the 868 MHz band, which protocol are you using? A. European installation bus B. Lon Talk C. MODBUS D. LonMark E. Modicon A. European installation bus Within building automation hardware systems, there is a hierarchical system of micro processor based controllers. Which type of controller is used to provide limited port capacity for connection of sensors, support, and execution of DDC programs, and usually operates in stand alone mode? A. System level controller - B. Field level controller - C. Management level processor - D. Protocol management system - E. DDC manager - B. Field level controller - What type of address is 00-A1-C3-52-CE-11? A. IP B. MAC C. Host D. Broadcast E. Unicast B. MAC Which layer of the OSI model covers physical cable connections? A. Layer 1 B. Layer 3 C. Layer 5 D. Layer 7 A. Layer 1 MAC addresses are _____________ bits in length. A. 16 B. 24 C. 32 D. 48 E. 64 D. 48 The ITU-T G.711 standard deals with what aspect of video conferencing? A. Coding and compression B. File transfer during video conference C. Call control during video conference D. Voice compression during video conferencing D. Voice compression during video conferencing You are placing PTP fiber between two locations 55 km (34 miles) apart. You are told thatDWDM equipment will be installed within the next 5 years. Which of the following optical fiber types should you use? A. Dispersion unshifted (ITU-G652) B. Dispersion shifted (ITU-G653) C. Cut off shifted (ITU-G654) D. Non-zero dispersion shifted (ITU-G655) E. Bending loss insensitive (ITU-G657) D. Non-zero dispersion shifted (ITU-G655) You have been selected to recommend a solution to increase response time and add fault tolerance to a bank of servers. Your budget is limited and the client needs a solution as soon as possible (ASAP). Which of the following options should be considered with the short time frame and limited budget? A. Link aggregation B. Device clustering C. Backup network switching devices D. Off site mass storage E. Installation of RAID devices B. Device clustering Geographically speaking, a ______ links two or more distant sites. A. SAN B. PAN C. LAN D. CAN E. WAN E. WAN A 24 port layer 2 switch can perform all of the following functions EXCEPT: A. Bridge B. Route C. Link aggregation D. Full duplex operation B. Route A ______ intercepts a file and stores it temporarily in queue until a peripheral device (e.g. printer) is available. A. Server B. Spooler C. Jump drive D. Printer B. Spooler Data representation including code translations, compressions, and encryptions is performed by what layer of the OSI model? A. Layer 2 B. Layer 3 C. Layer 4 D. Layer 5 E. Layer 6 E. Layer 6 The purpose of QoS on an IP network is for: A. FAX transmission B. Data representation C. Audio quality D. Streaming video quality E. Real time web based services C. Audio quality IPv-4 addresses are ________ bits in length. A. 16 B. 24 C. 32