Maintenance Tech I - II Conventional Progression Practice Test

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• Who can perform acceptable calibration for FCC proof-of-performance (POP) testing?
• What purpose do diplex filters serve when used with a two-way amplifier module?
• What is the primary function of coaxial cables in communication systems?
• Why does the output level from customer premises equipment (CPE) vary?
• What is the maximum in-channel frequency response defined in DOCSIS?
• What agency's accuracy is the calibration of test equipment traceable to for precise measurements?
• The number of field test points for proof-of-performance tests is determined by what factor?
• How often should preventive maintenance be conducted?
• What tool helps measure electrical resistance in components?
• What is the primary difference between AC and DC current?
• How is the effectiveness of an amplifier typically assessed during a sweep event?
• Why is it recommended to use spreadsheets for outlining proof-of-performance test procedures?
• What is one common symptom of a failing motor?
• What is a common issue that can affect downstream signal quality during a sweep?
• What do pneumatic systems primarily use to function?
• What does the time domain reflectometer specifically assess in coaxial cables?
• What is the voltage into the second amplifier in cascade if each amplifier draws 1.5 amps and the loop resistance is 1.38 ohms?
• What equalizer and attenuator pad should be installed if the transceiver reports 3.2 dBmV at 6 MHz and 2.5 dBmV at 41 MHz?
• When conducting proof-of-performance (POP) testing, why is a bandpass filter necessary during the video signal to coherent beats test?
• When is the return path considered properly balanced with unity gain?
• What is the purpose of maintenance protocols?
• What combination is necessary in the optical return path to achieve optimal performance from the DOCSIS 3.1 specification?
• What system is a byproduct of the "funneling effect"?
• What is the attenuation loss through the hot-leg of an unbalanced three-way splitter at sub-split frequencies?
• What should be the ideal characteristics of a test signal injected into an upstream optical transmitter?
• What type of interface is commonly found on an optical power meter besides RS-232 ports?
• In HVAC systems, what is the function of an air filter?
• Where should injected sweep pulses be placed during return path sweeping?
• What can be done to identify potential return path problems in the drop system?
• What is a likely reason for signal leakage in an HFC network?
• What is the primary function of a bridger amplifier in tree-and-branch architecture?
• When standing waves are present in the sweep response, what does the frequency separation indicate?
• What type of maintenance involves immediate repair after a breakdown?
• What advantage is realized by increasing the voltage in a broadband cable network from 60 volts alternating current (VAC) to 90 volts?
• What is the advantage of using a digital multimeter?
• What type of test signal is used in modern sweep systems to avoid interference with channels?
• When should oil levels in machinery be checked?
• Which type of conveyor uses a belt to move materials?
• What happens to the data throughput when transitioning from quadrature phase shift keying (QPSK) to 16-QAM (quadrature amplitude modulation) in a channel of the same bandwidth?
• What key factor should be analyzed on network design maps to troubleshoot issues?
• What is a characteristic of orthogonal frequency division multiplexing (OFDM) channel subcarriers?
• What is the typical voltage for residential electrical systems in North America?
• What action should be taken once electrical interference in the power network is identified?
• Which type of measurement provides an "apples-to-apples" comparison between carriers of differing bandwidths?
• What is the purpose of lubrication in machinery?
• What is the function of a drop system in a cable network?
• What is spliced into a hardline coaxial cable to combine AC power with RF signals in an HFC network?
• What is the appropriate level adjustment for the output of return amplifiers?
• What is a major benefit of preventive maintenance programs?
• What is the result of laser clipping in a broadband network?
• What feature of DOCSIS proactive network maintenance (PNM) assists in troubleshooting?
• What should a maintenance technician do upon finding unsafe working conditions?
• What is the importance of following the manufacturer's maintenance guidelines?
• What does a normalized reference trace from a fiber-node test point remove from the sweep process?
• Why is the main downstream output upstream input port of a distribution amplifier typically the first to be swept?
• Which cleaning agent is primarily used for degreasing?
• During a proof-of-performance test, the minimum number of locations to test is based on what?
• What is the primary role of a maintenance technician?
• What is a key safety consideration when working with chemicals?
• What characterizes a distribution amplifier on a network design map?
• Which refrigerant is commonly used in HVAC systems?
• What is the primary use of a wavelength-isolating power meter?
• Which of the following best describes the nature of packetized data transmission?
• Where can a less-experienced technician find the meaning of non-standard symbols on network design maps?
• What problems are caused by egress from a hybrid fiber/coax (HFC) network?
• In the context of network maintenance, what is considered a minor task?
• Which type of motor is commonly used in household applications?
• In a standby network power supply, what component comes online to convert the battery voltage to alternating current?
• What is the primary cause of corrosion in metal components?
• What is a recommended practice when replacing a light bulb?
• Which tool is typically used for tightening or loosening nuts and bolts?
• What is essential for maintaining the physical integrity of the coaxial cable network?
• Name a safety procedure when using ladders.
• Where is a clamp-on ammeter attached to measure the output current from a network power supply?
• What type of maintenance is performed on equipment before it breaks down?
• In plumbing, what does “drainage” refer to?
• Why is it important to keep work areas clean and organized?
• Why is a dipole antenna used in the triangulation technique for finding leak sources?
• In a pneumatic system, what is primarily used to store and compress air?
• What should maintenance technicians monitor regularly to ensure safety?
• What recourse do broadband cable operators have regarding interference from citizens band (CB) and ham radio signals?
• Which safety equipment is crucial for working at heights?
• What is the primary purpose of a circuit breaker?
• What is the function of the 2 kHz modulation when testing fibers with a laser light source?
• Which tool is essential for troubleshooting wiring issues?
• What is established by normalized reference traces taken at a fiber-node test point?
• In which situation would a fuse likely blow?
• How many modems can the code words and spreading algorithm of synchronous code division multiple access (S-CDMA) enable to transmit simultaneously on the same RF return channel?
• Which part of a ferroresonant transformer regulates the load on the secondary winding?
• What does it indicate if the ninth bar in a cable modem's PreEqualization Tap response is less than 10 dB below the eighth bar?
• What characterizes micro-reflections compared to other signal reflections?
• Where in the network is common path distortion (CPD) typically most severe?
• How does signal attenuation through coaxial cable compare at sub-band frequencies versus forward path frequencies?
• How many customers must a cable system have at a minimum for FCC proof-of-performance (POP) testing to be required?
• Why are 6 MHz and 41 MHz chosen for test carriers in a return path spectrum of 5 MHz to 42 MHz?
• House amplifiers with a passive return path are used in what situation?
• What effect does an evaluation of leak measurements typically have on customer service?
• What is the approximate calculated level of a leak if it reads 14 microvolts per meter (uV/m) at 80 feet?
• What is a key benefit of enforcing an aggressive signal leakage policy?
• How does surge protection at the input and output of a ferroresonant power supply defend against voltage surges?
• What type of data is generally documented during proof-of-performance tests?
• What type of maintenance can help identify potential issues before they become serious?
• What type of protective equipment is essential when working with hazardous substances?
• What does the RF distribution tap value on a tap face plate indicate?
• If a leak measures 1.25 microvolts per meter (μV/m) from about 160 feet, how should it be addressed?
• What should be done when trying to locate a very strong leakage signal?
• What must happen to a video signal to observe the composite triple beat (CBT) on a spectrum analyzer?
• In a DOCSIS 3.1 orthogonal frequency division multiple access (OFDMA) upstream channel, the average power of the subcarriers are normalized to what bandwidth?
• Chipsets with ingress cancellation algorithms are most effective for removing impairments in what portion of the RF return frequency spectrum?
• What potential issues may arise from high modem activity in an HFC network?
• What is the purpose of amplifying the forward path in cable systems?
• What does the acronym PPE stand for in a maintenance context?
• Why are high-pass filters (HPF) considered a short-term solution on drops without two-way services?
• What should you do first before servicing electrical equipment?
• What do most models of laser light sources use as their operational status indicators?
• What is the primary responsibility of a Maintenance Technician I?
• What is advised if injected test carriers appear at the transceiver with frequency response variations of less than 1 dB?
• What is the main advantage of using energy-efficient equipment?
• According to FCC regulations, what is the required distance for antenna leakage measurements?
• Why might a system implement a many-to-one configuration?
• Name one type of valve commonly used in plumbing systems.
• Which media access control (MAC) protocols are specified for digital set-top boxes (STB)?
• In electrical systems, what does AC stand for?
• Which tool is essential for electrical troubleshooting?
• Which optical band is predominantly used for optical amplifiers due to low attenuation loss and the availability of economical amplifiers?
• What is the purpose of the high-pass filter in a power inserter with three filtering networks?
• What is the advantage of supplying alternating current to multiple amplifiers from one network power supply?
• What is crucial for a technician to understand when measuring transmit and receive power?
• What is the function of the sweep pulse in a downstream test?
• Which of the following is NOT a benefit of regular maintenance?
• What does a maintenance work order typically include?
• What is a common solution for dealing with congestion in a hybrid fiber/coax (HFC) network?
• What technology evolved after the adoption of switched digital video (SDV) due to the limitations found in legacy hybrid fiber coax (HFC) networks?
• Regarding traditional analog return paths, what is essential for the upstream optical transmitter?
• Why is 38 MHz typically the highest frequency used for upstream modem transmissions?
• What is typically measured from 10 feet away from the coaxial cable for leakage logging?
• What does a pressure gauge measure?
• What is QPSK modulation primarily used for in communication systems?
• What is the main function of bearings in machinery?
• In terms of equipment operation, what does "downtime" refer to?
• What is one advantage of using a programmable logic controller (PLC)?
• How can laser clipping in the return path be identified on a spectrum analyzer?
• What does the Zero Span function on a spectrum analyzer provide?
• What is a sign that indicates the customer premises may be the source of leakage?
• What information can a return path monitoring system provide when capturing the QAM return channel from a DOCSIS modem?
• What is the purpose of routine maintenance?
• What inserts alternating current into the network with a direct connection to an amplifier?
• How have optical power meters evolved in terms of record-keeping?
• Which of the following is a common cause of equipment failure?
• What does it mean to "bleed" a hydraulic line?
• What is a priority in any standby power supply maintenance program?
• Which instrument sends a test signal and displays reflections caused by impedance mismatches?
• What is a primary cause of bit errors in digital modulation channels?
• Before measuring end-to-end attenuation, what must be considered?
• What does the acronym HVAC stand for?
• What is the role of a fuse in an electrical system?
• When is it appropriate to use a preamplifier with a spectrum analyzer to measure impairments?
• What access schemes were introduced with advanced Physical (PHY) Layer technologies in DOCSIS 2.0?
• Which features are combined into an optical loss test set?
• What is the primary responsibility of a technician during an emergency?
• How many decimal values can eight bits of data represent?
• What component in an HVAC system is primarily responsible for controlling airflow?
• What could cause low-frequency roll-off in the downstream spectrum?
• Which piece of equipment is essential for headend proof-of-performance (POP) measurements?
• What tool is commonly used to tighten or loosen bolts?
• What is the primary purpose of proper calibration of test equipment in maintenance?
• What should be confirmed before diagnosing a return path problem in the drop system?
• What does the term "calibration" refer to in maintenance?
• Which technologies are highlighted in DOCSIS 4.0 for sustaining HFC networks?
• What is a common tool used by maintenance technicians for measuring electrical voltage?
• What could be a potential consequence of not addressing low-frequency roll-off in a sweep?
• Why is it essential to observe good engineering practices during proof-of-performance tests?
• What does the term "bearing clearance" refer to?
• Where should at least one proof-of-performance test point be located in a cable system?
• What role does the headend play in the context of sweep response evaluations?
• How should a directional test point be installed to allow both upstream and downstream views?
• What limitation of Fabry-Perot (FP) lasers is addressed by distributed feedback (DFB) lasers?
• How does the quality of connections within the drop system impact overall network performance?
• How is the downstream signal from the trunk fed to the distribution branches in tree-and-branch architecture?
• What is a common cause of a leaking faucet?
• What leakage level needs to be recorded in the leakage log?
• What is a proper procedure when handling hazardous materials?
• What is the purpose of insulation in electrical wiring?
• How does the output signal level of the upstream receiver change in response to input power in a traditional analog return?
• What is a common method to minimize thermal noise added to a network?
• What is the function of a capacitor in electronic equipment?
• What action should be taken if air quality in a structure is poor?
• What is done with leakage values equal to or greater than 50 microvolts per meter (µVm) when calculating the network cumulative leakage index (CLI)?
• Why is proper ventilation crucial in buildings?
• Which of the following is a sign of a leaking pipe?
• Why are RF return channel carriers unsuitable for aligning return path equipment?
• Why is the E band considered undefined in fiber-optics communications?
• What is a primary characteristic of optical fiber identifiers?
• What is the main function of an air filter in HVAC systems?
• If a large percentage of set-top boxes transmit above 55 dBmV, what should be checked?
• What does "ventilation" refer to in HVAC terminology?
• Give an example of a condition that indicates machinery requires immediate attention.
• What enables set-top boxes (STB) and DOCSIS modems to operate as completely separate systems?
• In what application are avalanche photodiodes (APD) primarily utilized?
• What type of maintenance involves replacing parts based on a schedule?
• What is the function of a lockout/tagout procedure?
• What are the symptoms of hum on an upstream digital modulation channel?
• Which of the following steps is NOT part of troubleshooting signal leakage?
• What type of coupling is used to connect two shafts?
• What is the purpose of a maintenance checklist?
• Which maintenance task can improve indoor air quality?
• When not in use, how should tools be stored?
• What type of liquid is mainly used in hydraulic systems?
• What does the FCC require in terms of guidelines for performing proof-of-performance (POP) tests?
• Why is it acceptable to use dBmV, a voltage measurement, for power allocation in a channel bandwidth?
• How often should maintenance technicians inspect equipment?
• What can be used alongside a signal level meter (SLM) to check RF continuity at sub-band frequencies?
• Which of the following practices can help prevent injuries while using tools?
• Why should troubleshooting for impulse noise begin at distribution taps of 17 dB or lower?
• For testing FTTx installations, optical power meters should be calibrated for which wavelengths?
• What did the 1.1 version of DOCSIS introduce for real-time data applications?
• What is the main function of a thermostat?
• What does the term "overload" mean in electrical systems?
• Why is proper ventilation important in maintenance work areas?
• What maintenance task is essential for prolonging the life of an engine?
• What is the main reason for performing proof-of-performance tests in a cable system?
• What does the signal level meter report when displaying return test carriers as a delta measurement?
• Which type of digital modulation contains four symbols with 2 bits in each symbol?
• Why is it important to minimize ingress and impulse noise in a network?
• How is impulse noise typically represented on a spectrum analyzer?
• Which of the following is an electrical safety device?
• Which spectrum analyzer function is useful for capturing and analyzing ingress and impulse noise?
• Where are upstream levels and sweep responses measured in an HFC network?
• What does ingress in a broadband network refer to?
• What is one commonly used type of welding in maintenance work?
• Which advanced Physical Layer (PHY) technology developed and added to DOCSIS 2.0 includes byte interleaving?
• What allows the STB upstream carrier to be reliably received below 20 MHz?
• What does it indicate if signal leakage signs disappear when the ground block is disconnected?