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SUMMIT PRACTICE PREP EJ3 QUESTIONS &
ANSWERS
Testing or flagging of a video picture is the direct result of : - Answer - grounded loop What is the maximum resistance error rate of a 1000 ohm resistor with an error rate of 10% - Answer - 900 - 1100 ohms What is the color of an equipment grounding wire - Answer - Green with yellow stripe The best product for a closed circuit system more than 7000' without re-amplification is:
- Answer - Fiber Telecom wire grounded on each end, what is the electrical path called? - Answer - Ground loop The heat anticipator on the load of a line voltage thermostat is connected in: - Answer - Series with the heating contacts When white and black bars appear on a video monitor the condition is known as hum. What causes this condition? - Answer - Radiated energy Which of the following factors would not affect the temperature of conductors under a full load? - Answer - Voltage What are the disadvantages of fiber optics over copper? - Answer - Cost What is the measurement of the amount of signal for fiber optics - Answer - Bandwidth What is the main function of the drop relay in a closed circuit security alarm system - Answer - Latch the coil to keep the circuit in alarm condition Which of these detectors uses a microphone? - Answer - Audio A television signal is measured in which of following? - Answer - megahertz What is a conductors insulation rating based on? - Answer - circuit voltage Which of the following affects the resistance of a conductor? - Answer - material What type of output is preferred when selecting an amplifier for a 5 speaker public audio system install? - Answer - Ease of matching impedence Windings in a transformer go around a - Answer - core
Cable TV coax can be tested using what? - Answer - digital multimeter What is used to test batteries? - Answer - voltmeter and load What is another name for frequency? - Answer - Band What is the name of the typical coax connector? - Answer - Type F What part of a speaker transfers electrical energy to acoustical? - Answer - Transducer Any intentional alteration of frequency response including tone control is termed: - Answer - equalization The outer protective coating of a cable is referred to as: - Answer - jacket What device is used to measure resistance on a grounding rod? - Answer - Ohmmeter Two computers directly connected to one another would be an example of a : - Answer
- Point to point network A connection of links with a common node is an example of a : - Answer - star network Multiple computers sharing a common line is an example of a : - Answer - Bus network What pushes electrical current : - Answer - Voltage Which of the following would not raise resistance of a ground rod : - Answer - Remove water from the soil What type of system is it if a circuit looks like a ladder : - Answer - parallel What are the characteristics of a two conductor antenna cable : - Answer - Two conductors separated by a thin insulation Devices connected in tandem are considered to be : - Answer - in series Items wired end to end are considered in : - Answer - series In a loudspeaker what accomplishes the actual transduction of electrical signals into sound waves? - Answer - Driver All of the following are acceptable methods for lowering the resistance of a grounding rod except: (note: higher moisture content will result in lower resistance, but adding water is temporary as the water will dry out.) - Answer - Doubling the length, and the diameter of a grounding rod
What is the maximum size overcucrent device allowable device allowable on a non power limited fire alarm (NPLFA) system using 16 AWG conductors? - Answer - 10 amps A _______ is a fire detector initiating device whose detecting element is concentrated at a particular location. - Answer - Spot type heat detector A _______ is a unit of an electrical system that carries or controls electric energy as its principal function - Answer - device A _______ is described in the NEC as any electric circuit that energizes signaling equipment - Answer - signaling circuit The secondary power supply for emergency voice/alarm communications service system shall be capable of operating the system during a fire or other emergency condition for a period of ___ at maximum connected load - Answer - 15 min. what is the lowest allowed db level above ambient sound for an alarm system in a sleeping area? - Answer - 15 db Audible public mode signals must be a minimum of 15 db above ambient noise levels, true? - Answer - True What is the minimum allowed grounding conductor on a coaxial cable? - Answer - 14 awg Coaxial cables entering a mobile home must be grounded within ft. of the exterior wall of the mobile home it serves - Answer - 30 ft In communication circuits the primary protector shall be located " " to the point of entrance - Answer - as close as practicable After an alarm is installed in service, how long until a sensitivity test is required? - Answer - 1 year What is the smallest allowable grounding conductor for a communication circuit? - Answer - 14 awg Which is the best choice for risers in CATV or radio distribution systems - Answer - CMR or CATVR In a class 2 power limited circuit, what is the cable of choice for a plenum? - Answer - CL2P
How many class 2 transformers with two output connections paralleled are allowed to be interconnected? - Answer - none (unless listed for such interconnection) Supply circuits and interconnecting cables under raised floors supplying information technology equipment in a data processing room must be: - Answer - accessible What is the maximum number of supervisory switches permitted to be connected to actuate a single transmitter? - Answer - 20 What is a decibel? - Answer - a tenth of a bell What is the maximum allowable size space for a fire alarm annunciation system? - Answer - 22,500 sq. ft. Optical fiber cables installed exposed on the surface of ceilings and walls shall be supported by the building structure in such a manner that the cable will not be: - Answer - Damaged by normal building use Types ________ and _________ shall be listed as being suitable for general purpose use with the exception of risers and plenums and shall be tested as being resistant to the spread of fire. - Answer - OFNG and OFCG Access to electrical equipment shall not be denied by an accumulation of optical fiber cables that " " removal of panels, including suspended ceiling panels - Answer - prevents Access to electrical equipment shall not be denied by an accumulation of communications ____ that prevents the removal of suspended-ceiling panels. - Answer
- cables Nonconductive optical fiber cable contains no metallic members and no other " " materials - Answer - electrically conductive Optical fiber cables are not required to be listed and marked where the length of the cable within the building measured from its point of entrance does not exceed __________ and the cable enters the building from the outside and is terminated in an enclosure. - Answer - 50 ft. In Class I, Division I locations all apparatus and equipment for signaling alarm remote control and communications systems shall be identified as Class I, Division I - Answer - regardless of voltage What is the minimum size grounding conductor for communications circuits: - Answer - 14 awg What is the maximum voltage that a coaxial cable is allowed to carry? - Answer - 60 v
Which of the following anchors may not be used to secure electrical equipment to masonry walls? - Answer - Wooden plugs driven into holes in the masonry for holding wooden screws An area where combustible dust is present but is normally insufficient to moisture with normal operations of electrical equipment, would be defined as what type of hazardous location? - Answer - class 2 division 2 Hazardous locations where combustible dust is not normally in the air in quantities sufficient to provide explosive or ignitable mixtures, and dust accumulations are normally insufficient with the normal operation of electrical equipment. - Answer - Class II division II which of the following locations are hazardous due to the presence of combustible dust?
- Answer - class 2 locations For the purposes of the NEC which of the following would not be considered a device??
- Answer - Speaker receptacle, loud speaker What is the minimum width of working space requires for electrical equipment that us 48 inches wide? - Answer - 48 inches An electrical conduit buried 18'' below grade shall have a warning tape at how many inches above the conduit?: - Answer - 12'' An overhead feeder must have a clearance of __ from chimneys, radio, and television antennas. - Answer - 3 ft. When the system has been completed and tested, when are the alarm strobes, gas and heat detectors checked? - Answer - Annually Components that are non-fire alarm and connected com only to fire alarm components are considered what type of system? - Answer - Combination system A fire alarm system is required where a visible notification device is present when the ambient sound is greater than ___? - Answer - 105 dba What is the maximum interval the fire alarm signal is allowed at the console? - Answer - 15 seconds All of the following are acceptable means of testing a smoke detector except - Answer - Fiber Determine the class and division for a location in which sufficient quantities of combustible dust are normally present in the air to produce explosive mixtures. - Answer - Class 2 division 1
Given: a smoke detection system is being installed to automatically close a double doorway in response to smoke blowing in either direction, the ceiling is smooth. Where must the smoke detector be installed? - Answer - On the centerline of a doorway On a beam ceiling where the beams are less than 12 inches in depth and spacing is less than 96 inches where should the smoke detectors be mounted? - Answer - At the bottom of the beam Any of the following can impact and change the temperature of conductors and insulation except for: - Answer - Applied voltage to the conductors Where are splices allowed in conductors in surface metal raceways if they do not have removable covers? - Answer - Only in boxes or junction boxes What is the minimum required height for a propriety manual pull fire alarm? - Answer - 3 and 1/2 feet (4 and 1/2 max) What is the function of a green wire in a manufactured home? - Answer - grounding connection All of the following is acceptable as a ground except? - Answer - a 10 ft. gas pipe What is the minimum clearance to the edge of a wood stud for a wire hole? - Answer - 1 and 1/4 inches What is the minimum required clearance between a receiving antenna and 250 volt line not insulated? - Answer - 2 feet A basic alarm system will have __ power sources. - Answer - 2 In a manufactured home the grounding bus shall be ___ through the green color insulated conductor in the supply cord or the feeder wiring to the service ground in the service equipment located adjacent to the mobile home. - Answer - connected According to NEC class 3 or (1) circuits are allowed a minimum wire size of what gauge? - Answer - 18 awg Type PLTC nonmetallic sheathed shall be a minimum size ___ gauge for class 3 circuits and have an insulation rating of at least 300 V - Answer - 22 gauge The NEC classifies Continuous Load as equipment running at a maximum load for a minimum of _______? - Answer - 3 hours How do you increase the voltage through a circuit after it passes through? - Answer - boost transformer
You have a frequency that has been amplified to four frequencies, this change is called ________? - Answer - frequency multiplexing When a company ties together multiple devices such as computers and printers, the result is called a _________? - Answer - network Which part of a power supply converts electrical current from AC to DC? - Answer - a rectifier What type of device has a + and - - Answer - polarized A current that leaves its intended path and returns to the source bypassing the load causes the circuit to be ______? - Answer - shorted When installing a 1/2" format camera looking at the building 30' away and it is 18' in height and 22' wide what the the mm lens size that is required - Answer - 8mm lens What is the benefit of a covert CCTV system over an overt (known) system? - Answer - To catch a repeated offender What does CCTV stand for? - Answer - Closed Circuit Television What is the maximum bandwidth of a standard television channel? - Answer - 6 Mhz Which of the following is mandatory code - Answer - NEC 770 What causes a sound system to hum or buzz - Answer - Ground loop problems Which of the following has the most resistance? - Answer - poor connection What type of connector is used for the RG6 cabling? - Answer - Type F A crossover is confined to a band of frequencies for which a component is responsible, this is accomplished by - Answer - a frequency dividing network A CCTV signal is what type of signal? - Answer - composite Single mode fiber cable does not experience modal dispersion and is not limited by bandwidth, rather it is limited by ________ - Answer - Attenuation caused by the electronic devices within the system Fiber cable splicing which consists of aligning 2 clean fibers end to end and joining them with an electric arc, is called ____? - Answer - fusion splicing You will find difficulty using UF cable underground because _________ - Answer - gophers will eat it
How do you test a tamper switch on sprinkler system - Answer - turn knob 2 turns to the right Cat 3 cable wire is rated at? - Answer - 16 mhz Cat 5 cable is rated at - Answer - 100 mhz A microphone is connected to what device? - Answer - mixer A network in which each computer is connected to two other computers forming a circle is called - Answer - ring network A system in which all communication devices go back to a central switching point is called a: __________ - Answer - network A CCTV signal uses what type of signal? - Answer - NTSC - All CCTV cameras used in North America provide an electrical video signal that meets standards developed by the National Television System Committee (NTSC). An electric current thats movement reverses at regularly recurring intervals is known as
- Answer - alternating current What are the characteristics of a holdup alarm? - Answer - button activated and typically silent What is a device that steps up or steps down voltage - Answer - a transformer On a satellite receiver what sends the polarized voltage back to the LNB - Answer - Sat in or Sat out? On a 12 volt line there is a 6K resistor across, what voltage do you have - Answer - 12 volts What is a balun? - Answer - A circuit device used to connect a balanced transmission line to an unbalanced load, A balance to unbalanced transformer What is the advantage of a single ended beam detector verses a double ended beam detector? - Answer - A double beam requires more installation What is the disadvantage to having outdoor intrusion detectors? - Answer - Air turbulence causes false alarms what is considered to be the service life of a smoke detector? - Answer - 10 years
When boring a hole in a joist, rafter, or wood member, holes shall be bored so that the edge of the hole is not less than ____ from the nearest edge of the wood member. - Answer - 1 and 1/4 '' All electrical products used in an electrical system in New Mexico that are not listed and labeled must be: - Answer - certified by a nationally recognized testing laboratory In a corridor with high lumen strobe notification appliances, what is the maximum spacing between units? - Answer - 100 ft. Activation of the initiating device shall occur within _________ seconds of water flow at the alarm-initiating device - Answer - 90 seconds What is the minimum decibel level at pillow level for an audible appliance installed to provide signal to a sleeping - Answer - 75 db A tamper valve (control valve switch) shall be operated and signal receipt shall be verified within the first _______ turns of the hand wheel. - Answer - two What is the maximum number of waterflow switches permitted to be connected to actuate a single transmitter - Answer - 5 What is the minimum number of fire alarms for a two bedroom home with sleeping areas on opposite ends of the home? - Answer - 4 What is the minimum time that a residential fire alarm must be capable of sounding under battery power? - Answer - 4 minutes At what distance from the ceiling should a smoke detector be located? - Answer - Between 4 - 12 inches For smoke detector spacing on peaked ceilings, detectors shall be spaced and located within _____ feet of the peak, measured horizontally - Answer - 3 feet Smoke detectors may be wall mounted. If so, the minimum distance from the ceiling is? Inches. The maximum distance is? Inches. - Answer - 4 and 12 inches What is the maximum allowable distance between manual fire alarm boxes? (travel distance) - Answer - 200 ft What is the maximum allowable distance from an exit doorway opening (on multi story building) and a manual fire alarm box? - Answer - 5 ft. What is the smallest single conductor cable listed for outdoor use that are resistant to sunlight and moisture allowed for module interconnections on a solar photoelectric system? - Answer - 18 awg
What type of cable is permissible for module interconnections within a photovoltaic array that are exposed to the weather? - Answer - USE - 12 Underground communication circuits in a raceway handhole enclosure, or manhole containing electric light conductors shall be: - Answer - Separated from such conductors underground communication conductors in a raceway, handhole or manhole containing electric light and power conductors, shall be in a section ______ from such conductors by means of separator - Answer - Separated A class 2 conductor in the same cable as communication conductor shall be listed and treated as: - Answer - communications cable Eight communication cables run in a CMC underground between two 24 story buildings. What is the maximum distance between the buildings where lightning protection is NOT required? - Answer - 140 ft. In what reference would you find accepted industry practices for mechanical execution of work performed on optical fiber cables and raceways - Answer - ANSI/NECA/BICSI 568 - 2006 For the purpose of communication systems a block would be defined as: - Answer - a portion of a city enclosed by streets, Communication cables shall have a voltage rating of not less than _______ volts - Answer - 300 What is the maximum allowable output of a class 1 power limited circuit? vA - Answer - 1000 vA Which of the following is an acceptable marking method (means of identification) for the grounding conductor on a grounding type receptacle - Answer - A green colored hexagonal headed or shaped terminal screw. the words "green" or "ground," or the letters "G" or "GR," or a grounding symbol A phase converter is an electrical device that: - Answer - converts single-phase power to 3-phase electrical power When using a phase converter for a fixed load the single phase conductors must have an ampacity not less than what _______ percentage of the full load current rating of the motor or other load being served where the input and output voltages are the same - Answer - 250% Locations where easily ignitable fibers are stored - Answer - Class 3, division 2 ( Class III, Division II)
What is the national fire protection association code publication that refers to household fire-fighting equipment? - Answer - NFPA 72 The supplier or contractor that installs house fire warning is required to provide the building owner with all the following materials except: - Answer - drawings that show the interconnection of tandem connected connectors According to NEC, class 3 circuits are allowed a minimum wire size of ________ awg - Answer - 18 awg What is the minimum length of a grounding rod in an application of less than 50 (60) volts? - Answer - 8 feet What type of wire is to be used for common direct burial? : - Answer - USE or UF? Underground service entrance cable If a cable is being installed in an area that is above a suspended ceiling that contains completely enclosed air ducts. What term or word identifies this location? - Answer - Accessible According to the NEC electrical equipment may not be mounted to concrete, cinder block, or brick walls with these___ - Answer - wooden plugs Which of the following is a characteristic of a hold up alarm? : - Answer - It overrides the fire alarm Which of the following is not a cause of an intermittent trouble fault condition - Answer - ground fault What is a major disadvantage to using copper clad steel cable for an antenna? : - Answer - it knots and kinks easily
