Power Supplies

Question 1

Commercial power that feeds our power supplies and home are _______ or ________ VAC

Answer 1

120 or 240

Question 2

Commercial power that feeds our power supplies is ______Hz

Answer 2

60

Question 3

Commercial power that feeds our power supplies is a _________ wave

Answer 3

Sine

Question 4

3 battery power supplies have a voltage of ______

Answer 4

36V

Question 5

What changes the DC battery volts to VAC?

Answer 5

Power Supply Inverter

Question 6

What changes the input VAC from 120V or 240V to 60V or 90V output?

Answer 6

Step Down Transformer

Question 7

What device combines the PS voltage with the network RF signal?

Answer 7

LPI (Line Power Inserter)

Question 8

SPI

Answer 8

Service Power Inserter

Question 9

What devices are used to direct AC power?

Answer 9

Fuses or Shunts

Question 10

This device has a low pass filter on each leg, this prevents RF leakage in the Power Supply

Answer 10

LPI (Line Power Inserter)

Question 11

Powering architecture where there is only one power supply used to power the entire node and actives

Answer 11

Centralized powering

Question 12

this power architecture is the most commonly used

Answer 12

distributed powering

Question 13

Center Conductor Resistance + Sheath Resistance

Answer 13

DC Loop Resistance

Question 14

Span current X Span resistance

Answer 14

Voltage drop

Question 15

Voltage difference between batteries should be no more than:

Answer 15

0.3VDC

Question 16

Battery terminals should be protected w/ corrosion inhibitor like NO-OX or NCP-2, True or False

Answer 16

True

Question 17

Before disconnecting the batteries always turn off the _______ ________ first

Answer 17

Battery Breaker

Question 18

Use a ________ to accurately measure power supply output VAC

Answer 18

True RMS Volt Meter

Question 19

The most accurate & Reliable way to test batteries is to test them under _______ Conditions

Answer 19

Load

Question 20

When testing with a load tester, batteries should or should not be disconnected

Answer 20

Should

Question 21

Power supply batteries produce what gas when charging?

Answer 21

Hydrogen

Question 22

Powering architecture where there is more than one power supply feeding the node and actives

Answer 22

Distributed power

Question 23

Divide and conquer means

Answer 23

Cut the problem in half

Question 24

The purpose of divide and conquer is to

Answer 24

Reduce Repair time

Question 25

A frequency selective volt meter

Answer 25

SLM (Signal Level Meter)

Question 26

two most commonly used pieces of test equipment

Answer 26

SLM & VOM (or DMM)

Question 27

The majority of outages are _______ related

Answer 27

Power

Question 28

TDR

Answer 28

Time Domain Reflectometer

Question 29

In a terminated cable with no faults, the TDR energy is absorbed meaning there is _________ reflected energy

Answer 29

NO

Question 30

Correct ________ is needed for correct TDR Measurements

Answer 30

VOP (Velocity of Propogation)

Question 31

Resistance to AC is called

Answer 31

Impedance

Question 32

two types of TDRs

Answer 32

Waveform & Digital

Question 33

VOP

Answer 33

Velocity of Propogation

Question 34

this is caused by the time lag needed for the TDR pulse to enter the cable

Answer 34

Dead Zone

Question 35

use a ________ ________ to minimize the effect of a dead zone

Answer 35

Launch Jumper

Question 36

The most accurate way to find a fault with a TDR is to

Answer 36

TDR from both ends and divide the difference in half

Question 37

A TDR trace with the same polarity

Answer 37

Open

Question 38

A TDR Reflection with the opposite polarity

Answer 38

Short

Question 39

a properly terminated cable will _______ the TDR pulse energy

Answer 39

absorb

Question 40

``` Locate colors- Power: Gas: Telecom: Water: ```

Answer 40

Red yellow orange blue

Question 41

Sending AC from two different power supplies to the same point

Answer 41

Bucking Power

Question 42

A low resistance connection between two points in an electric circuit

Answer 42

Shunt

Question 43

used to direct power in the CATV network

Answer 43

shunts & fuses

Question 44

In the return path, the pads and EQs are insalled on the ________ side of the return amplifier to provide flat inputs to the next upstream amplifier

Answer 44

output

Question 45

cumulative effect of the return path distortions

Answer 45

funnel effect

Question 46

CPD beats fall _____ apart in the upstream

Answer 46

6MHz

Question 47

In the forward path, CPD contributes to ______ distortions

Answer 47

CTB

Question 48

Return path noise caused by arching electrical motors

Answer 48

Impulse Noise

Question 49

Trenches greater than _______ feet must be shored to prevent cave ins

Answer 49

4ft

Question 50

In coax, the attenuation of the reverse signals is _______ than that of the forward signals

Answer 50

Less