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ES3J Study Questions & Correct
Answers
Rectifier - ANSWERSWhat part of power supply converts electrical current from AC to DC Grounded loop - ANSWERSTearing or flagging of a video picture is the direct result of Frequency multiplexing - ANSWERSYou have a frequency that has been amplified to four frequencies the change is called 19-23" wide - ANSWERSWhich of the following is true of an equipment rack? In series with the heating contacts - ANSWERSThe heat anticipator on the load of a line voltage thermostat is connected ______? 75 - ANSWERSThe standard impedence of a standard video coax cable is ____ OHMS? Boost transformer - ANSWERSHow do you increase the voltage through a circuit after it passes through? Reflective light - ANSWERSHow would you get the best picture on a monitor? Green with a yellow stripe - ANSWERSWhat is the color of an equipment grounding wire? 900 OHM - ANSWERSWhat is the minimum resistance error of a 1000 OHM resistor with an error of 10%? Fiber Optic - ANSWERSThe best product for a closed circuit system is with more than 7000 without reamplification is?
The F speed stop of the lens - ANSWERSWhat is a cameras sensitivity based on? Balancing Transformer - ANSWERSHow do you get rid of snow on a monitor? Ceiling grid - ANSWERSWhen mounting an interior camera which of the following is not a suitable location? Fiber Optic Cable - ANSWERSGiven: Hardwire alarm system control panel should be installed so that they help reduce magnetic downtime and false alarms, electromagnetic interference must be prevented from entering the system control panel and causing interference. Which of the following eliminates EMI? Short Circuit - ANSWERSWhich of the following should not cause a swinger? Radiated Energy - ANSWERSWhen white and black bars appear on a video monitor, this condition is known as hum, what causes this condition? Voltage - ANSWERSWhich of the following factors would not affect the temperature of conductors under a full load? Star, bus, hierrachal ARE ALL multipoint - ANSWERSWhat type of network is not considered multipoint? Voltmeter - ANSWERSWhat device is best used to test a dry cell? Shorted - ANSWERSA length of COAX cable used for data is terminated at one end with 50 OHM terminator, the resistance between the shield and the center conductor at the other end of the cable is 0 OHMS; this indicated the cable continuity is _____? Bell Current Stays - ANSWERSAll of the following are advantages to using a relay to remote actuate a signaling device except? 44 - ANSWERSGiven: 4 Speakers wired in seried of 4 OHMS, 8 OHMS, 16 OHMS, and 16 OHMS, what is the total impedence? Black - ANSWERSThe power wire for AC is designated by what color? 75 OHMS - ANSWERSThe standard impedance of the terminator cable is Latching Relay (this is the answer) Exit Delay Deranged Delay - ANSWERSAll of the following are the same except ADD ground straps - ANSWERSAll of the following are means to repair objectionable current in metal raceways except:
To catch a repeated offender - ANSWERSWhat is the benefit of a covert CCTV system over an overt system? Multiplexer - ANSWERSOn a screen what will give you the greatest number of views? Circuit Voltage - ANSWERSWhat is a conductor's insulation rating based on? Couloumb - ANSWERSOne ampere is the same as one _____ per second? Material - ANSWERSWhich of the following affects the resistance of a conductor? Ease of matching impedence - ANSWERSWhat type of output is preferred when selecting an amplifier for a 5 speaker public address system installation? Core - ANSWERSWindings in a transformer go around a _____? Digital Multimeter - ANSWERSCable TV coax can be tested by using what? Closed Circuit Television - ANSWERSWhat does CCTV stand for? 6 MHZ - ANSWERSWhat is the maximum bandwidth of a standard television channel? NEC 770 - ANSWERSWhich of the following is mandatory code Ground Loop Problems - ANSWERSWhat causes a sound system to hum or buzz Poor connection - ANSWERSWhich of the following has the most resistance? Network - ANSWERSWhen a company ties together multiple devices such as computers and printers its called a Type F - ANSWERSWhat type of connector is used for the RG6 cabeling? Load and Voltmeter - ANSWERSWhat is used to test batteries a Type F - ANSWERSWhat is the name of the typical coax connector Transducer - ANSWERSWhat part of the speaker transfers the electrical energy to acoustical, changes electrical energy into another form? Equalization - ANSWERSAny intentional alteration of frequency response including tone control is termed: A frequency dividing network - ANSWERSA crossover is confined to a band of frequencies for which a component is responsible , this is accomplished by
Attentuation caused by the electronic devices within the system - ANSWERSSingle mode fiber cable does not experience modal dispersion and is not limited by bandwidth Gophers will eat it - ANSWERSYou will find it difficulty using UF cable underground because Double the reading - ANSWERSWith the settings too low on an amp meter what will happen if you wrap the wire around twice? Driver - ANSWERSIn a loud speaker what accomplishes the actual transduction of electrical signals into soundwaves Add salt to the soil - ANSWERSAll of the following are acceptable methods for lowering the resistance of ground rot except 1000 FT - ANSWERSWhat is the industry accepted maximum length for RG59U cable? Cat 4 - ANSWERSWhat is a cable that consists of 4 unshielded twisted pair rated at 20 MHZ Turn Knob 2 turns to the right - ANSWERSHow do you test a tamper switch on sprinkler system 16 MHZ - ANSWERSCat 3 cable wire is rated at? Jacket - ANSWERSThe outer protective coating on a cable is referred to as COAX - ANSWERSWhat is a RG8V cable? In series - ANSWERSItems wired end to end are considered Simultaneously - ANSWERSBundled cables are to be pulled Pulse no Pulse - ANSWERSDescribe the characteristics of a digital signal Voltage that is variable with time - ANSWERSDescribe the characteristics of an analog signal Point to point network - ANSWERS2 Computers directly connected to each other is an example of Star Network - ANSWERSA collection of links with a common node is an example Bus Network - ANSWERSMultiple computer sharing a common line is and example of a
Remove water from the soil - ANSWERSWhich of the following would NOT raise resistance of a ground rod? Parallel - ANSWERSWhat type of system is it if a circuit looks like a ladder? In Series - ANSWERSDevices connected in tandem are considered to be? A double beam requires more installation - ANSWERSWhat is the advantage of a single ended beam detector verses a double ended beam detector? Air turbulence causes false alarms - ANSWERSWhat is the disadvantage to having outdoor intrusion detectors 10 years - ANSWERSwhat is considered to be the service life of a smoke detector? Follow manufacturer's instrcutions - ANSWERSWhat is the best method for testing a smoke alarm? 2 conductors separated by a thin insulation strip - ANSWERSWhat are the characteristics of a 2 conductor antenna system? Bad switch - ANSWERSa 12 volt circuit with a 21 OHM resistor is being tested with the switch closed, the reading shows 1.2 volts, what is the problem? Install a resistor - ANSWERSWhen testing a shunt loop what needs to be done prior to testing? Ground Fault - ANSWERSWhich of the following is not a case of an intermittent trouble fault condition (swinger)? Polarized - ANSWERSWhat type of device has a + and - Equal to - ANSWERSand AC and DC circuit both have the same voltage and have 6 OHM resistors installed. The impedence of the AC circuit is ____ the resistance of the DC circuit Add a bonding jumper - ANSWERSA coax cable that is designed for 60 volts is reading 63 Volts, how can the situation be remedied? Condensor or Ribbon Micropohne - ANSWERSWhat type of microphone provides the LEAST amount of transient distortion Moving Coil - ANSWERSWhat type of microphone provides the MOST amount of transient distortion?
Test for resistance - ANSWERSHow would someone check a coax cable to make sure it is good? 24 - ANSWERSmost telephone cable is comprised of solid gauge copper wire 22-26 - ANSWERSTwisted pair wiring designed for data transmission is usually between _____ gauge? Photoelectric smoke detector - ANSWERSWhat type of detecting device is would work best for smoldering fire? Power on or Power off - ANSWERSA digital signaling is signal consisting of? OFC - ANSWERSWhat classification of fiber optic cable can be run in an HVAC duct Mixer - ANSWERSA microphone is connected to what device? Fixed coil and movable iron vain - ANSWERSWhat are the components of a magnetic vain meter? db is 100th of a Bell - ANSWERSAll of the following are true except Metallic cable shield - ANSWERSEquipment powered by coax cable must be grounded by BNC connector - ANSWERSIf you were putting in a cable connection for CCTV what connector would you use? Dining Room - ANSWERSWhen installing smoke detectors in a house you should consider installing a heat detector in the _____? 100 MHZ - ANSWERSCat 5 cable is rated at Electrical outlet - ANSWERSA communication worker can ground to all of the following except a Grounded loop - ANSWERSTelecom wire grounded on each end, what is the electrical path called use a lower voltage light because their filaments are stronger - ANSWERSif you have pilot lamps that are blown and exposed to high vibrations what should you do? EMI Immunity - ANSWERSA primary advantage that optical fiber has over copper cable pairs is that a fiber optic transmission offers?
