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Service Technician 3 Revised Questions and Answers / Sure A +, Exams of Advanced Data Analysis

University of Florida (UF)Advanced Data Analysis

What is the proper way to express a signal voltage of 10 mV in cable TV terms - ✔✔20log (10mV/1mV)=10 dBmV What are two reasons why the output signal level from a directional coupler is less than the input signal level? - ✔✔The signal power sent to the tap port is not available to go to the output port, and the loss in the transformers and other parts of the directional coupler Which of the following directional coupler values will exhibit the highest output insertion loss? - ✔✔7 dB

Typology: Exams

2024/2025

Available from 07/13/2025

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Service Technician 3 Revised
Questions and Answers / Sure A +
What is the proper way to express a signal voltage of 10 mV in cable TV terms - ✔✔20log
(10mV/1mV)=10 dBmV
What are two reasons why the output signal level from a directional coupler is less than the input
signal level? - ✔✔The signal power sent to the tap port is not available to go to the output port, and
the loss in the transformers and other parts of the directional coupler
Which of the following directional coupler values will exhibit the highest output insertion loss? -
✔✔7 dB
Which statement characterizes a directional coupler? - ✔✔The downstream signal level is greater at
a 7 dB tap port than at a 12 dB tap port with the same input signal level
What is the downstream output port signal level for a directional coupler when (1)the input signal
level is 35.0 dBmV, (2) the output port insertion loss value is 1.4 dB? - ✔✔33.6 dBmV
What does the configuration of the directional coupler faceplate and housing enable? - ✔✔The
housing can be installed in any orientation, regardless of the direction of signal flow
Which of the following describes a power inserter - ✔✔It contains a high-pass filter network that
passes RF signals between the two RF/AC ports and blocks 60-Hz 60 VAC between the same two
ports.
Which of the following statements is true? - ✔✔For each power inserter, the system design must
ensure that (1) the current required by any one RF/AC port does not exceed that ports power-passing
specification and (2) the current required by both RF/AC ports does not exceed the AC input port
power-passing specification
What is the AC input voltage of a power inserter when (1)the cable between the power supply and
the power inserter is 200 feet long (2) the cables loop resistance is 1.07 Ohms/1000 feet (3) the
power supply output voltage is 60 VAC and (4) the total current requirement is 11.4 amps - ✔✔54.92
pf3
pf4
pf5

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Service Technician 3 Revised

Questions and Answers / Sure A +

What is the proper way to express a signal voltage of 10 mV in cable TV terms - ✔✔20log (10mV/1mV)=10 dBmV What are two reasons why the output signal level from a directional coupler is less than the input signal level? - ✔✔The signal power sent to the tap port is not available to go to the output port, and the loss in the transformers and other parts of the directional coupler Which of the following directional coupler values will exhibit the highest output insertion loss? - ✔✔7 dB Which statement characterizes a directional coupler? - ✔✔The downstream signal level is greater at a 7 dB tap port than at a 12 dB tap port with the same input signal level What is the downstream output port signal level for a directional coupler when (1)the input signal level is 35.0 dBmV, (2) the output port insertion loss value is 1.4 dB? - ✔✔33.6 dBmV What does the configuration of the directional coupler faceplate and housing enable? - ✔✔The housing can be installed in any orientation, regardless of the direction of signal flow Which of the following describes a power inserter - ✔✔It contains a high-pass filter network that passes RF signals between the two RF/AC ports and blocks 60-Hz 60 VAC between the same two ports. Which of the following statements is true? - ✔✔For each power inserter, the system design must ensure that (1) the current required by any one RF/AC port does not exceed that ports power-passing specification and (2) the current required by both RF/AC ports does not exceed the AC input port power-passing specification What is the AC input voltage of a power inserter when (1)the cable between the power supply and the power inserter is 200 feet long (2) the cables loop resistance is 1.07 Ohms/1000 feet (3) the power supply output voltage is 60 VAC and (4) the total current requirement is 11.4 amps - ✔✔54.

Calculate the capacitive reactance of a power inserters feed-through capacitor when (1) the frequency is 50 MHz and (2) the capacitance value is 1000 pF - ✔✔5.30 Ohms Which characterizes a feed-through tap? - ✔✔It has a directional coupler portion that efficiently routes most of the signal to the output port while removing a small amount of the signal and passing it to the splitter network The terminating tap - ✔✔Is the last tap installed at the end of the feeder cable run An RF/AC bypass tap - ✔✔Has the added feature of being able to maintain RF signal and AC voltage continuity during faceplate removal Three components of the tap housing (and not the tap faceplate) are - ✔✔The threaded mounting tap, seizure screw mechanisms, and right angled input and output ports Tap loss is - ✔✔The signal attenuation between the input port and each tap port at a specific frequency Signal attenuation between two individual customer tap ports at a specific frequency, with all other ports terminated, is the definition of - ✔✔Tap-to-tap isolation Which of the following statements is true? - ✔✔In general, the closer the tap is to the amplifier output port the higher the tap value On cable system design maps, standard symbols include a - ✔✔Circle for a two-way tap, a square for a four-way tap, and a hexagon for an eight-way tap The output port RF signal level is ______dBmV at 50 MHz and the tap port signal level is __________ dBmV at 50 MHz for a two way feed through tap when (1) the input port signal level is 30.5 dBmV at 50 (2) the insertion loss is 3.3 dB at 50 MHz, and (3) the tap loss is 7.6 dB at 50 MHz - ✔✔27.2 and

What is the tap port RF signal level at 550 MHz for a four way terminating tap when (1) the preceding taps output port signal is 25.0 dBmV at 550 (2) the cable length between the two taps is 110 feet (3) the cable loss rate specification is 1.82/100 feet at 550 and .54/100 at 50 MHz and the tap loss is 14.2 dB at 550 MHz - ✔✔8.8 dBmV

A distribution amplifier is housed in a die-cast aluminum housing. What is another item that can be mounted to the housing cover that connects to the distribution amplifier? - ✔✔DC power supply A distribution amplifier requires a specific power input to function. How much Dc power is provided by the B+regulated DC voltage power supply? - ✔✔+24 volts DC Shorts in the coaxial cable and excessive amounts of current can damage the distribution amplifier. Several devices can be used to protect the distribution amplifier from these problems. Which device shorts to ground when a overvoltage situation occurs? - ✔✔An FTEC (Fast Transfer Electronic Crowbar) There are several passive components in a distribution amplifier. Each component changes the signal in a different way. Which component reduces the signal equally at all frequencies - ✔✔An attenuator pad Which type of distribution amplifier gain control maintains the amplifiers RF output at a set level if the input levels to the amplifier change (within design tolerances)? - ✔✔An automatic gain control (AGC) Many factors influence signal attention. what is the effect of temperature on cable signal attenuation? - ✔✔The higher the temperature, the greater the cable signal attenuation Which of the following distribution amplifier parts is controlled manually? - ✔✔The response control As you work with distribution amplifiers on the cable system you must be aware that what you do can affect the various types of signal distortions. What type of distortion is defined as "an interfering beat whose frequency is +/- 75Mhz or 1.25 MHz from the video carrier frequency? - ✔✔Composite second order (CSO) When you are installing or troubleshooting a distribution amplifier, what should you do to make sure that there is a flat frequency response coming from the amplifier? - ✔✔Make sure the cover plates are tightened. What does the output waveform of a ferroresonant transformer most closely resemble at maximum load? - ✔✔A sine wave

In a standby ferroresonant power supply, what device keeps the battery powered AC power from feeding back to the utility? - ✔✔An isolation relay Which tool do you use to accurately measure the output voltage of a ferroresonant power supply? - ✔✔A true RMS (root mean square) DMM You are performing periodic maintenance on a standby ferroresonant power supply. Where should you measure the output current? - ✔✔At the stinger wire. The are three filtering networks in a power inserter. What is the purpose of the high-pass filter? - ✔✔To prevent the 60 VAC or 90 VAC from passing between the two RF/AC ports In a ferroresonant transformer , what part regulates the load on the secondary winding? - ✔✔The transformer Shunts. Which tool do you use to measure the input current on the input wiring? - ✔✔A Clamp-on Ammeter What would be the voltage drop across a cable 1,240 feet away from a 60 VAC power supply if the cable is .625 inch with a resistance of 1.1 ohm per 1000 feet, conduction 4 amperes? - ✔✔5.5 VAC What is the voltage into amplifier B the second amplifier in cascade, under the following conditions? Each amplifier draws 1.5 amps of current the output of the 60 VAC power supply is inserted 1. feet from the input of amplifier A on the output of amplifier A is 1320 feet of cable feeding amplifier B. The cable have the same resistance of 1.1 ohm per 1000 feet - ✔✔53.9 VAC What is one type of device used for output surge protection on a ferroresonant transformer? - ✔✔A crowbar circuit What are the three most common components of an atom, and where are thy located in the atom? - ✔✔Protons and neutrons are located in the nucleus of the atom, and electrons are located in orbit around the nucleus. which of the following is the least important characteristic of an intrinsic semiconductor? - ✔✔Intrinsic semiconductors are typically made of silicon material