2
Maintenance Tech I-II Conventional Exam with precise || || || || || || ||
detailed answers ||
What advantage is realized by increasing the voltage in a broadband cable network from 60
|| || || || || || || || || || || || || || ||
volts alternating current (VAC) to 90 volts? - ✔✔Operating with 50% more voltage reduces
|| || || || || || || || || || || || || ||
the voltage drop and current drawn in the network for more efficient power utilization.
|| || || || || || || || || || || || ||
How does surge protection at the input and output of a ferroresonant power supply defend
|| || || || || || || || || || || || || || ||
against voltage surges? - ✔✔By passing voltage surges (within the surge device rating) to
|| || || || || || || || || || || || || ||
ground without damage. || ||
Which part of a ferroresonant transformer regulates the load on the secondary winding? -
|| || || || || || || || || || || || || ||
✔✔The magnetic shunt. || ||
In a standby network power supply, what comes online to convert the battery voltage to
|| || || || || || || || || || || || || || ||
alternating current (AC), which then goes to the ferroresonant transformer? - ✔✔The
|| || || || || || || || || || || ||
battery-powered inverter. ||
In a power inserter with three filtering networks, what is the purpose of the high-pass filter?
|| || || || || || || || || || || || || || ||
- ✔✔To prevent the 60 hertz (Hz) alternating current (AC) from passing between the two
|| || || || || || || || || || || || || || || ||
radio frequency (RF)/AC ports. || || ||
What inserts alternating current (AC) into the network with a direct connection to an
|| || || || || || || || || || || || || ||
amplifier rather than using a power inserter? - ✔✔The amplifier AC circuitry.
|| || || || || || || || || || ||
What is the advantage for supplying alternating current (AC) to multiple amplifiers from
|| || || || || || || || || || || || ||
one network power supply? - ✔✔Allows the designer to place amplifiers without concern
|| || || || || || || || || || || || ||
about access to electrical utility power.
|| || || || ||
, 2
Where is a clamp-on ammeter attached to measure the output current from a network
|| || || || || || || || || || || || || ||
power supply? - ✔✔Clamped around the conductor attached to the lug that tightens down
|| || || || || || || || || || || || || ||
on the coaxial cable connector pin.
|| || || || ||
What is a priority in any standby power supply maintenance program? - ✔✔Battery care.
|| || || || || || || || || || || || ||
What is the voltage into the second amplifier in cascade, if each amplifier draws 1.5 amps of
|| || || || || || || || || || || || || || || ||
current, the loop resistance of each section of cable is 1.38 ohms, and the alternating
|| || || || || || || || || || || || || || || ||
current (AC) source is a 90 volts AC (VAC) network power supply? - ✔✔83.77 VAC.
|| || || || || || || || || || || || || ||
What enables set-top boxes (STB) and Data Over Cable Service Interface Specification
|| || || || || || || || || || || ||
(DOCSIS) modems to operate as completely separate systems that operate independent of
|| || || || || || || || || || || ||
each other? - ✔✔STB and DOCSIS modems are assigned different upstream channels with
|| || || || || || || || || || || || ||
dedicated receivers in the headend. || || || ||
What did the 1.1 version of the Data Over Cable Service Interface Specification (DOCSIS)
|| || || || || || || || || || || || || ||
introduce, incorporating solutions for transporting real-time data applications (such as
|| || || || || || || || || ||
voice traffic) over the cable operator's managed IP network, and doing so with quality
|| || || || || || || || || || || || || ||
comparable to that of the telephone company? - ✔✔PacketCable. || || || || || || || ||
Why is 38 MHz typically the highest frequency in the sub-band frequency that is used for
|| || || || || || || || || || || || || || || ||
upstream modem transmissions? - ✔✔The upper edge of the sub-band frequency spectrum
|| || || || || || || || || || || ||
is prone to group delay caused by the diplex filters.
|| || || || || || || || ||
What enables the set-top box (STB) upstream carrier to be located below 20 MHz and still
|| || || || || || || || || || || || || || || ||
be reliably received? - ✔✔The narrow bandwidth and quadrature phase shift keying
|| || || || || || || || || || || ||
(QPSK) modulation. ||
What system is a byproduct of the "funneling effect"? - ✔✔A many-to-one system.
|| || || || || || || || || || || ||
Maintenance Tech I-II Conventional Exam with precise || || || || || || ||
detailed answers ||
What advantage is realized by increasing the voltage in a broadband cable network from 60
|| || || || || || || || || || || || || || ||
volts alternating current (VAC) to 90 volts? - ✔✔Operating with 50% more voltage reduces
|| || || || || || || || || || || || || ||
the voltage drop and current drawn in the network for more efficient power utilization.
|| || || || || || || || || || || || ||
How does surge protection at the input and output of a ferroresonant power supply defend
|| || || || || || || || || || || || || || ||
against voltage surges? - ✔✔By passing voltage surges (within the surge device rating) to
|| || || || || || || || || || || || || ||
ground without damage. || ||
Which part of a ferroresonant transformer regulates the load on the secondary winding? -
|| || || || || || || || || || || || || ||
✔✔The magnetic shunt. || ||
In a standby network power supply, what comes online to convert the battery voltage to
|| || || || || || || || || || || || || || ||
alternating current (AC), which then goes to the ferroresonant transformer? - ✔✔The
|| || || || || || || || || || || ||
battery-powered inverter. ||
In a power inserter with three filtering networks, what is the purpose of the high-pass filter?
|| || || || || || || || || || || || || || ||
- ✔✔To prevent the 60 hertz (Hz) alternating current (AC) from passing between the two
|| || || || || || || || || || || || || || || ||
radio frequency (RF)/AC ports. || || ||
What inserts alternating current (AC) into the network with a direct connection to an
|| || || || || || || || || || || || || ||
amplifier rather than using a power inserter? - ✔✔The amplifier AC circuitry.
|| || || || || || || || || || ||
What is the advantage for supplying alternating current (AC) to multiple amplifiers from
|| || || || || || || || || || || || ||
one network power supply? - ✔✔Allows the designer to place amplifiers without concern
|| || || || || || || || || || || || ||
about access to electrical utility power.
|| || || || ||
, 2
Where is a clamp-on ammeter attached to measure the output current from a network
|| || || || || || || || || || || || || ||
power supply? - ✔✔Clamped around the conductor attached to the lug that tightens down
|| || || || || || || || || || || || || ||
on the coaxial cable connector pin.
|| || || || ||
What is a priority in any standby power supply maintenance program? - ✔✔Battery care.
|| || || || || || || || || || || || ||
What is the voltage into the second amplifier in cascade, if each amplifier draws 1.5 amps of
|| || || || || || || || || || || || || || || ||
current, the loop resistance of each section of cable is 1.38 ohms, and the alternating
|| || || || || || || || || || || || || || || ||
current (AC) source is a 90 volts AC (VAC) network power supply? - ✔✔83.77 VAC.
|| || || || || || || || || || || || || ||
What enables set-top boxes (STB) and Data Over Cable Service Interface Specification
|| || || || || || || || || || || ||
(DOCSIS) modems to operate as completely separate systems that operate independent of
|| || || || || || || || || || || ||
each other? - ✔✔STB and DOCSIS modems are assigned different upstream channels with
|| || || || || || || || || || || || ||
dedicated receivers in the headend. || || || ||
What did the 1.1 version of the Data Over Cable Service Interface Specification (DOCSIS)
|| || || || || || || || || || || || || ||
introduce, incorporating solutions for transporting real-time data applications (such as
|| || || || || || || || || ||
voice traffic) over the cable operator's managed IP network, and doing so with quality
|| || || || || || || || || || || || || ||
comparable to that of the telephone company? - ✔✔PacketCable. || || || || || || || ||
Why is 38 MHz typically the highest frequency in the sub-band frequency that is used for
|| || || || || || || || || || || || || || || ||
upstream modem transmissions? - ✔✔The upper edge of the sub-band frequency spectrum
|| || || || || || || || || || || ||
is prone to group delay caused by the diplex filters.
|| || || || || || || || ||
What enables the set-top box (STB) upstream carrier to be located below 20 MHz and still
|| || || || || || || || || || || || || || || ||
be reliably received? - ✔✔The narrow bandwidth and quadrature phase shift keying
|| || || || || || || || || || || ||
(QPSK) modulation. ||
What system is a byproduct of the "funneling effect"? - ✔✔A many-to-one system.
|| || || || || || || || || || || ||
