Deck 17: Dhti

Question 1

Which of the following is a unit used to measure the energy absorption capability of a surge suppressor?

A)Amps
B)Joules
C)Volts
D)Ohms

Answer 1

Joules

Question 2

Which of the following is a national standard that governs the installation and testing of fire alarm systems?

A)NFPA 72
B)NEC 72
C)IEEE 72
D)EIA/TIA 72

Answer 2

NFPA 72

Question 3

You want to use a reader that does not require a card or key to be inserted or swiped. Which of the following should you use?

A)Barcode
B)Magnetic stripe
C)Electronic key
D)Proximity card

Answer 3

Proximity card

Question 4

Which of the following cable types can substitute the recommended RS-485 cabling used for an access control system?

A)Cat 3
B)Coaxial cable
C)Cat 5e
D)Fiber Optic cable

Question 5

John wants to install a wall-mounted motion detector. What is the optimal height at which it should be installed?

A)Four feet
B)Two feet
C)One foot
D)Seven feet

Question 6

Which of the following connector types is used to connect a security system control panel to a telephone interface?

A)RJ-31x
B)RJ-11x
C)RJ-21
D)RJ-45

Question 7

Harry wants to install smoke detectors in his home office. Which of the following locations in the house need not have a smoke detector installed?

A)Bedroom
B)Bathroom
C)Conference room
D)Server room

Question 8

Which of the following is a secondary criterion when choosing a video camera for a surveillance system?

A)Focal length
B)Mounting style
C)Light sensitivity
D)Color

Question 9

Which of the following is the unit used to measure the light sensitivity of a camera?

A)Ohms
B)Lux
C)Volts
D)Microfarads

Question 10

You want to use a camera type that can provide illumination in darkened areas. Which of the following surveillance camera types should you use?

A)Analog
B)IP
C)IR
D)RF

Question 11

Which of the following is a term used to describe an area that can be viewed through a video camera lens?

A)Focal range
B)Grid range
C)Lens zone
D)Viewing zone

Question 12

You want to use a coaxial cabling type that runs longer than 200 feet. Which of the following should you use?

A)RG8
B)RG58
C)RG6
D)RG56

Question 13

Which device transmits video signals across twisted-pair wiring?

A)Modulator
B)Balun
C)Switcher
D)Multiplexer

Question 14

Which of the following is the resistance level required on a video system for impedance and termination?

A)110 ohms
B)60 ohms
C)75 ohms
D)50 ohms

Question 15

If three terminations are present on a video loop, what percentage of the signal will arrive at a display device?

A)100 percent
B)75 percent
C)50 percent
D)25 percent

Question 16

Which of the following is not a compression method used for video images?

A)ACC
B)VGA
C)MPEG
D)MPEG-2

Question 17

Which of the following specifies the life expectancy of a compact fluorescent lamp?

A)200 hours
B)2,500 hours
C)10,000 hours
D)500 hours

Question 18

Which of the following wiring types should be used for HVAC controls?

A)Shielded AWG 14 with a single conductor wire.
B)Shielded AWG 14 with 2 or more twisted conductor wires.
C)Shielded AWG 12 with 2 or more twisted conductor wires.
D)Unshielded AWG 14 with a single conductor wire.

Question 19

Which of the following is a standard for residential structured wiring for audio?

A)TIA/EIA 568A
B)TIA/EIA 568B
C)TIA/EIA 232
D)TIA/EIA 570A

Question 20

Which of the following specifies the acoustic sensitivity rating of an average speaker?

A)90 dB/Wm
B)80 dB/Wm
C)87 dB/Wm
D)100 dB/Wm

Question 21

By what factor should the amplifier's output be increased to have a 100 dB increase in speaker output?

A)Two
B)Three
C)Five
D)Ten

Question 22

What is the normal impedance level of a coaxial cable terminated with a BNC connector?

A)35 ohms
B)75 ohms
C)55 ohms
D)120 ohms

Question 23

Which of the following is an audio cable that releases all audio frequencies without adding delay?

A)Out-of-phase
B)Asynchronous
C)Synchronous
D)In-phase

Question 24

Which of the following audio/video cables includes carriers for positive, negative, and grounding signals?

A)STP
B)UTP
C)Parallel pair
D)Balanced

Question 25

Which of the following statements is not true about the RG58 coaxial cabling standard?

A)The impedance of RG58 is 50 Ohms.
B)The diameter of RG58 is 0.195 inches.
C)RG58 is terminated with BNC connectors.
D)RG58 is terminated with F-type connectors.

Question 26

Which of the following refers to an under-voltage event?

A)Brownout
B)Blackout
C)Power surge
D)Line noise

Question 27

You want to convert DC power into 120 V AC power. Which of the following should you use?

A)Power conditioner
B)Surge suppressor
C)Inverter
D)UPS

Question 28

Which of the following is the unit used to measure the capacity of a line conditioner?

A)Volt
B)Ohm
C)Decibel
D)Lumen

Question 29

Which of the following devices is required to interface an Ethernet device to an EIA/TIA 232 device?

A)PLC module
B)Bridge
C)Network adapter
D)Line conditioner

Question 30

Which of the following is the maximum number of conductors available in thermostat wiring?

A)Two
B)Seven
C)Four
D)Ten

Question 31

You want to use a video output standard that produces when connected from a PC to a projecting device. Which of the following video standards should you use?

A)SVGA
B)DVI
C)VGA
D)S-Video

Question 32

Which of the following is used to compensate for speaker distance when configuring surround sound systems?

A)Speaker delay
B)Speaker power
C)Speaker size
D)Speaker efficiency

Question 33

What is the decrease of the speaker volume in dB if the distance from the speaker to the sound source is doubled?

A)3 dB
B)4 dB
C)2 dB
D)6 dB

Question 34

Which of the following is used to combine satellite and OTA signals?

A)Diplexer
B)Duplexer
C)Transformer
D)LNB

Question 35

What is the impedance of a 10 ohm and 20 ohm speaker wired in parallel?

A)2)66 Ohms
B)6)66 Ohms
C)4 Ohms
D)30 Ohms

Question 36

What is the standard aspect ratio of HDTV?

A)2)35:1
B)1)78:1
C)4:3
D)3:2

Question 37

You want to place the rear surround speakers in an optimal location in a 5.1 surround installation. Which of the following is the recommended location?

A)Directly to the left and right and slightly in front of the listeners
B)Above and behind the listeners
C)Directly behind the listeners
D)Directly to the left and right and slightly behind the listeners

Question 38

Which of the following is an RF peer-to-peer mesh protocol used for lighting and other residential electronics?

A)X10
B)Wi-Fi
C)CEBus
D)Z-Wave

Question 39

Which of the following is a prime requirement for wires that are installed above a ceiling?

A)Plenum-rated
B)Fire proof
C)Fiberglass-coated
D)Teflon-coated

Question 40

Which of the following is the characteristic of a cable where a signal in one channel leaks into another channel and distorts the signal?

A)Attenuation
B)Interference
C)Crosstalk
D)Cancellation

Question 41

Which of the following is a characteristic of a cable that states the distance at which the signal traveling on a cable begins to weaken?

A)Cancellation
B)Crosstalk
C)Interference
D)Attenuation

Question 42

Identify the connector type shown in the image.

A)HDMI
B)S-video
C)DVI
D)F-type

Question 43

What is the maximum data transfer rate of the USB 2.0 data transmission standard?

A)10 MBps
B)25 MBps
C)60 MBps
D)100 MBps

Question 44

What is the maximum number of devices an IEEE 1394 connector can support?

A)100
B)25
C)50
D)63

Question 45

You want to configure a five-way connection for a speaker that uses a lug, bare wire loops, stripped wire, a banana plug, and a pin connector. Which of the following hardware should you use?

A)F-type connector
B)Spade
C)Binding post
D)Spring clip

Question 46

Which of the following best defines the NEXT test?

A)NEXT test places a test signal on one pair of wires and measures all of the other wire pairs for signal presence to measure the attenuation levels.
B)NEXT test places a test signal on one pair of wires and measures all of the other wire pairs for signal presence to measure the interference levels.
C)NEXT test measures the length of a cable segment.
D)NEXT test places a test signal on one pair of wires and measures all of the other wire pairs for signal presence to measure the crosstalk levels.

Question 47

Which of the following is the minimum recommended distance separation between a structured wiring cable and an AC electrical cable?

A)3 inches
B)10 inches
C)24 inches
D)40 inches

Question 48

Which of the following is a cable test that should be performed immediately after installing a structured cable and before the cable is terminated?

A)Fox and hound test
B)Continuity test
C)Attenuation test
D)Crosstalk feedback test

Question 49

Which of the following is the right order in a general troubleshooting procedure?

A)5, 4, 2, 1, 3, 6
B)3, 5, 2, 4, 5, 6
C)5, 4, 2, 3, 6, 1
D)5, 4, 2, 6, 3, 1

Question 50

Which of the following test devices are used to verify the pin-to-pin connectivity between two ends of a cable?

A)TDR
B)Wiremap
C)Multimeter
D)Tone generator

Question 51

Which of the following is a switching method that performs error checking on a message?

A)Cut-through
B)Error-check
C)Store-and-forward
D)Error-correction

Question 52

Which of the following is not a specification of the EIA/TIA 568 standard?

A)Patch cords used to connect a computer to a wall outlet should not exceed 3 meters.
B)Patch cords, the cables used to interconnect two devices at a horizontal cross-connect, should not exceed 6 meters in length.
C)Cable segment of Cat 5e UTP cable in a horizontal run should not exceed a maximum distance of 90 meters.
D)Patch cords used to connect a computer to a wall outlet should not exceed 10 meters.

Question 53

Which of the following is a standard that defines the transmission of HDTV signals across a home's electrical service lines?

A)HomePlug 1.0 Turbo
B)HomePlug AV
C)CEBus
D)HomePNA

Question 54

Which of the following is a maximum transmission distance for HIPERLAN?

A)100 meters
B)20 meters
C)200 meters
D)50 meters

Question 55

Which of the following protocols allows multiple internal nodes to share a single external IP address?

A)TCP
B)IP
C)NAT
D)UDP

Question 56

Which of the following commands should you type at the computer's command prompt to check the IP address of your computer?

A)Ping
B)Ipconfig
C)Tracert
D)Bootp

Question 57

Which of the following is true for Ohm's law?

A)Ohm's law states that a steady increase in voltage should reduce the magnitude of current through the circuit that has constant resistance.
B)Ohm's law states that a steady decrease in voltage should increase the magnitude of current through the circuit that has constant resistance.
C)Ohm's law states that a steady decrease in voltage should increase the magnitude of current through the circuit and increase the resistance offered by the circuit.
D)Ohm's law states that a steady increase in voltage should produce a constant and linear increase in current through the circuit that has constant resistance.

Question 58

Which of the following configuration types is used in a house when all rooms hear the same audio playback?

A)Single-zone
B)Multi-zone
C)Dual-zone
D)Composite

Question 59

Which of the following is an upper limit of the threshold capacitance above which you should consider replacing the capacitance?

A)50 pF/ft
B)200 pF/ft
C)100 pF/ft
D)500 pF/ft

Question 60

Which of the following is the impedance of a coaxial cable used in a distributed audio system?

A)15 ohms
B)50 ohms
C)75 ohms
D)100 ohms

Question 61

Which of the following channels on a video line has the greatest loss in a VHF system?

A)10
B)40
C)25
D)13

Question 62

Which of the following statements about NTSC and PAL are not true?

A)NTSC uses a fixed resolution of 525 horizontal lines and PAL uses 625 horizontal lines.
B)NTSC displays 30 frames per second and PAL displays at 25 frames per second.
C)PAL is a higher resolution format for DVD than NTSC.
D)Movies on NTSC DVDs play back 4% faster than their PAL counterparts.

Question 63

Which of the following is the dB signal loss per 100 feet for a RG6 coaxial cable?

A)10
B)12
C)4
D)6

Question 64

You are experiencing dark bars on your TV video display. Which of the following may be the most probable cause of this issue?

A)AC power interference
B)Insufficient cable bandwidth
C)Signal interruption between TV and modulator
D)High signal strength

Question 65

How many frequencies combine to produce a tone in a telephone?

A)Three
B)Two
C)Five
D)Six

Question 66

Which of the following cables is used to connect a telephone key set to a wall outlet?

A)66-block
B)Coaxial cable
C)Satin cord
D)TDR

Question 67

How many phone lines can be supported by a single run of Cat 3 or Cat 5e cable?

A)Two
B)Four
C)Three
D)Six

Question 68

Which of the following is a digital key system feature that allows for the integration of voice and data features and functions?

A)ACD
B)POTS
C)IVR
D)CTI

Question 69

Which of the following is used to transmit caller identification information?

A)IVR
B)FSK
C)DSL
D)H)323

Question 70

Which of the following technologies uses AC power lines to transmit lighting control system signals?

A)Token Ring
B)FIDDI
C)PLC
D)Wireless

Question 71

You are troubleshooting a dimmer control where the lamp remains ON even after disconnecting the neutral wire. Which of the following could be the likely cause of this issue?

A)Improper AC connections
B)The dimmer's Thyristor is bad
C)Dimmer control is faulty
D)Improper Min or Max setting on dimmer

Question 72

You are troubleshooting an issue with an incandescent lamp. The incandescent lamp brightens or dims when other fixtures are turned ON or OFF. Which of the following should you do to fix this problem?

A)Check the neutral connection in the main electrical panel.
B)Check circuit to correct over voltage situation.
C)Check the wattage of the lamp and match it to the fixture.
D)Replace the lamp.

Question 73

You are trying to help a customer fix a lighting issue. Which of the following should you do before starting the troubleshooting activities?

A)Disconnect all AC controls
B)Debrief the customer
C)Retest the system
D)Apply all manufacturer upgrades

Question 74

Which of the following defines the voltage at which a surge suppressor begins to protect the circuit?

A)Clamping voltage
B)Protection voltage
C)Suppressing voltage
D)Surge voltage

Question 75

You are assisting a customer who has issues with his PLC home automation system. He complains that three of the lights in a room turn ON and OFF intermittently. Which of the following should you ask the customer first?

A)Are the light bulbs in the room securely installed?
B)Have you removed or replaced the PLC lighting modules?
C)Have you added any new electrical devices in service at home?
D)Have you plugged any new electrical devices into the electrical circuits in the room in question?

Question 76

Which of the following is a home system protocol that can be used to integrate a computer network with home control controllers?

A)MAN
B)HAN
C)CAN
D)WAN

Question 77

Which of the following systems uses heated water circulating through pipes to heat a room?

A)Forced air
B)Hydronic
C)Heat pump
D)Convection

Question 78

How many conductors are used in a RJ-21x jack?

A)50
B)8
C)4
D)10

Question 79

Which of the following is a place where you should ideally place a thermostat?

A)On an outside wall
B)Near an electrical device
C)In direct sunlight
D)On an inside wall

Question 80

Which of the following specifies the maximum transmission range of an indoor 802.11b network access point?

A)150 feet
B)50 feet
C)500 feet
D)200 meters