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RCDD TEST QUESTIONS (TOPIC 15 - TOPIC 2 1 )
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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
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
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 (3 4 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-G6 52 ) B. Dispersion shifted (ITU-G 653 )
C. Cut off shifted (ITU-G 654 ) D. Non-zero dispersion shifted (ITU-G 655 ) E. Bending loss insensitive (ITU-G 657 ) - ✔✔D. Non-zero dispersion shifted (ITU-G 655 ) 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
C. 32
D. 48
E. 64 - ✔✔C. 32
What type of address is 10. 162. 02 .1 4? A. IP B. MAC C. Host D. Broadcast E. Unicast - ✔✔A. IP You have just assumed management responsibility over an older network consisting of passive hubs and some layer 2 switches. The network is experiencing massive slow downs on an irregular basis. Which of the following is the MOST effective immediate solution to the problem? A. Purchase and install layer 3 switching equipment. B. Purchase and install a software based gateway. C. Add bridges at key points in the network. D. Segment your network into smaller domains. - ✔✔A. Purchase and install layer 3 switching equipment. ITU-T G. 655 recommends which type of singlemode optical fiber? A. DSF B. N-DSF C. NZ-DSF D. SF - ✔✔C. NZ-DSF
Generating multiple message frames containing identical data being transferred to different individual devices is called: A. Unicast B. Replicating unicast C. Multicast D. Broadcast - ✔✔B. Replicating unicast The loop distance range in an "ethernet in the first mile" (EFM) design is: A. 2 km ( 1. 2 mi) B. 4 .8 km ( 3 mi) C. 6 .1 km ( 3 .8 mi) D. 9 .7 km (6 mi) E. 12 km ( 7 .5 mi) - ✔✔C. 6. 1 km ( 3 .8 mi) Route congestion and message priority are a few of the functions of what layer of the OSIModel? A. Layer 1 B. Layer 2 C. Layer 3 D. Layer 4 E. Layer 5 - ✔✔C. Layer 3 Geographically speaking, a covers an area associated with an individual's work space. A. SAN - B. PAN - C. LAN -
B. Gateway C. Router D. Switch - ✔✔C. Router When considering the DAS, which component acts as a bidirectional antenna? A. Multimode optical fiber cable B. Radiating coaxial cable C. Shielded twisted pair (STP) cable D. Single mode optical fiber cable E. Screened twisted pair (ScTP) cable - ✔✔B. Radiating coaxial cable Which of the following is NOT a primary method of transporting radio signals in an activeDAS? A. Analog modulation of the RF signal B. Down conversion of the RF signal C. Up conversion of the RF signal D. Digital sampling of the RF signal - ✔✔C. Up conversion of the RF signal You are designing a DAS system that has a requirement to supply both RF signal and power to the remote transceivers in the system. Which cable will provide the needed services for this application? A. Multimode optical fiber cable B. Radiation coaxial cable C. Shielded twisted-pair cable D. Single mode optical fiber cable E. Screened twisted pair (ScTP) cable - ✔✔C. Shielded twisted-pair cable You have been asked to design a public safety microwave radio system for the city ofFairbanks, Alaska. The requirement for reliability, maximum throughput, and minimum interference by fog, rain, or heavy snow is critical. Which frequency will best suit the system's needs?
A. 2 .4 GHz B. 4 .9 GHz C. 6 .0 GHz D. 11 .0 GHz E. 19. 0 GHz - ✔✔C. 6. 0 GHz You are designing a DAS that will support five buildings on a college campus. Which medium is best suited to ensure the best connectivity and throughput between the headend and backend devices located in the various buildings? A. Coaxial B. Optical fiber cabling C. Shielded twisted pair cabling D. Unshielded twisted pair cabling - ✔✔B. Optical fiber cabling What device is used in both wired and wireless networks to link network access devices? A. Bridge B. Gateway C. Router D. Switch - ✔✔A. Bridge You are designing multi band UHF police radio and VHF fire radio systems for a municipal office. Because of the closeness of the transmit and receive frequencies, you must ensure there is adequate filtering and gain control of the systems. Which device will best meet the ability to separate and control the transmit and receive signals? A. Bidirectional amplifier B. Transceiver
B. Receiver C. Transmitter D. Transceiver - ✔✔D. Transceiver You are designing a 4 .9 GHz microwave system that is using rectangular waveguide from the transceiver to the inside wall of the shelter and an antenna using elliptical waveguide from the antenna to the outside wall of the shelter. The antenna has been designed to be placed 200 ft up on a 250 ft tower. What device will you specify that will best interconnect the two different waveguides? A. Elliptical wave guide pass through B. Elliptical wave guide clamp C. Elliptical waveguide connector D. Elliptical waveguide flange - ✔✔C. Elliptical waveguide connector You are working with the Sheriff's Department to develop a public safety wireless network that will be secured from interference and have the capability of delivering up 10 Mbps subscriber speed. What microwave frequency should be used to best meet these needs? A. 2 .4 Ghz B. 4 .9 Ghz C. 5 .0 Ghz D. 5 .3 Ghz - ✔✔B. 4. 9 Ghz You are designing a 4 .9 GHz microwave system that is using rectangular waveguide from the transceiver to the inside wall of the shelter and an antenna that is to be placed 200 ft up on a 250 ft tower. What type of medium will be best suited to connect the antenna to the transceiver? A. Circular wave guide B. Elliptical wave guide C. Hard line coaxial D. Rectangular wave guide - ✔✔B. Elliptical wave guide
What is at the "root" of a DAS (distributive antenna system)? A. Antenna B. Receiver C. Transmitter D. Transceiver - ✔✔D. Transceiver The MINIMUM number of antennas needed to create a DAS is: A. One B. Three C. Five D. Seven - ✔✔A. One As a wireless designer, you have been tasked with designing a DAS which supports UHF public safety radios. You have determined that if you increase the power of the base station antenna, you can solve coverage problems in the basement. One of the restrictive items that you should consider is: A. A single antenna may not provide the total power multiple antennas may provide B. The proper launch amplifier has to be chosen to provide the proper power C. The building's wall types may still affect the coverage D. The legal limits of the transmitter - ✔✔D. The legal limits of the transmitter The propagation and path loss of radio signals in the target environment can be sampled using: A. Propagation software B. Radio power meters C. Directional antenna
A. 1 meter B. 5 meters C. 10 meters D. 50 meters E. 100 meters - ✔✔C. 10 meters In (ESS) design, employees, reputation, and materials are all examples of: A. Assets B. Risks C. Threats D. Countermeasures E. Systems - ✔✔A. Assets A security program consists of three independent components. They are electronic, architectural, and: A. Operational B. Physical C. Environmental D. Elemental - ✔✔A. Operational Which of the following is NOT a type of intrusion detection system sensor? A. Time-auxiliary B. Capacitance C. Vibration D. Electromechanical
E. Thermal - ✔✔A. Time-auxiliary For an analog camera, what is the normal frame rate in frames per second? The distance a CCTV signal may be run is determined by the strength of the signal at the source, required signal strength at the receiver, and: A. Signal loss of the cable B. Power requirement of the receiving device C. Recorded image D. Video format - ✔✔A. Signal loss of the cable The three electronic security system (ESS) concepts the consultant needs to understand when creating an ESS system are threats, countermeasures, and: A. Risks B. Mitigation techniques C. Asset control D. Integration E. Intrusion detection - ✔✔A. Risks The concept of the "security quandary" is based on providing a balancing act between what two elements? A. Access and isolation B. Risk and threat C. Asset and isolation D. Asset and risk E. Access and cost - ✔✔A. Access and isolation
