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2015 Tim > power supplies > Flashcards

power supplies Flashcards

1
Q

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

A

120 or 240

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2
Q

Commercial power that feeds our power supplies is ______Hz

A

60

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3
Q

Commercial power that feeds our power supplies is a _________ wave

A

Sine

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4
Q

3 battery power supplies have a voltage of ______

A

36V

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5
Q

What changes the DC battery volts to VAC?

A

Power Supply Inverter

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6
Q

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

A

Step Down Transformer

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7
Q

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

A

LPI (Line Power Inserter)

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8
Q

SPI

A

Service Power Inserter

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9
Q

What devices are used to direct AC power?

A

Fuses or Shunts

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10
Q

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

A

LPI (Line Power Inserter)

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11
Q

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

A

Centralized powering

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12
Q

this power architecture is the most commonly used

A

distributed powering

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13
Q

Center Conductor Resistance + Sheath Resistance

A

DC Loop Resistance

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14
Q

Span current X Span resistance

A

Voltage drop

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15
Q

Voltage difference between batteries should be no more than:

A

0.3VDC

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16
Q

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

A

True

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17
Q

Before disconnecting the batteries always turn off the _______ ________ first

A

Battery Breaker

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18
Q

Use a ________ to accurately measure power supply output VAC

A

True RMS Volt Meter

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19
Q

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

A

Load

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20
Q

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

A

Should

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21
Q

Power supply batteries produce what gas when charging?

A

Hydrogen

22
Q

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

A

Distributed power

23
Q

Divide and conquer means

A

Cut the problem in half

24
Q

The purpose of divide and conquer is to

A

Reduce Repair time

25
Q

A frequency selective volt meter

A

SLM (Signal Level Meter)

26
Q

two most commonly used pieces of test equipment

A

SLM & VOM (or DMM)

27
Q

The majority of outages are _______ related

A

Power

28
Q

TDR

A

Time Domain Reflectometer

29
Q

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

A

NO

30
Q

Correct ________ is needed for correct TDR Measurements

A

VOP (Velocity of Propogation)

31
Q

Resistance to AC is called

A

Impedance

32
Q

two types of TDRs

A

Waveform & Digital

33
Q

VOP

A

Velocity of Propogation

34
Q

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

A

Dead Zone

35
Q

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

A

Launch Jumper

36
Q

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

A

TDR from both ends and divide the difference in half

37
Q

A TDR trace with the same polarity

A

Open

38
Q

A TDR Reflection with the opposite polarity

A

Short

39
Q

a properly terminated cable will _______ the TDR pulse energy

A

absorb

40
Q

Locate colors-Power:Gas:Telecom:Water:

A

Redyelloworangeblue

41
Q

Sending AC from two different power supplies to the same point

A

Bucking Power

42
Q

A low resistance connection between two points in an electric circuit

A

Shunt

43
Q

used to direct power in the CATV network

A

shunts & fuses

44
Q

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

A

output

45
Q

cumulative effect of the return path distortions

A

funnel effect

46
Q

CPD beats fall _____ apart in the upstream

A

6MHz

47
Q

In the forward path, CPD contributes to ______ distortions

A

CTB

48
Q

Return path noise caused by arching electrical motors

A

Impulse Noise

49
Q

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

A

4ft

50
Q

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

A

Less

2015 Tim (18 decks)

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