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Dan2024 Study > Power Supplies (Ulearn Network Technician Core Skills) > Flashcards

Power Supplies (Ulearn Network Technician Core Skills) Flashcards

1
Q

Avoid contact with this conductor

A

300 V or less

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2
Q

Stay at least 12 inches away from this conductor

A

Between 300 V and 750 V

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3
Q

Stay at least 18 inches away from this conductor

A

Between 750 V and 2000 V

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4
Q

Stay at least 24 inches away from this conductor

A

Between 2000 V and 15000 V

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5
Q

Stay at least 36 inches away from this conductor

A

Between 15000 V and 37000 V

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6
Q

Stay at least 42 inches away from this conductor

A

Between 37500 V and 87500 V

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7
Q

Stay at least 48 inches away from this conductor

A

Between 87500 V and 121000 V

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8
Q

Stay at least 54 inches away from this conductor

A

between 121000 V and 140000 V

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9
Q

Foreign voltage detectors do not detect

A

DC Voltage

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10
Q

FVD

A

Foreign Voltage Detector

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11
Q

If the green LED does not light on a FVD (Foreign Voltage Detector)

A

The batter must be replaced

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12
Q

SPI

A

Service Power Inserter (Also known as an ALT box)

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13
Q

DMM

A

Digital Multi Meter

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14
Q

AC

A

Alternating Current

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15
Q

ATS

A

Automatic Transfer Switch

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16
Q

AWG

A

American Wire Gauge

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17
Q

LAP

A

Lightening Arrestor Protector

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18
Q

LED

A

Light Emitting Diode

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19
Q

MSO

A

Multiple System Operator

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20
Q

mV

A

Millivolt

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21
Q

NEC

A

National Electric Code

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22
Q

NESC

A

National Electric Safety Code

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23
Q

OSP

A

Outside Plant

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24
Q

PIM

A

Protective Interface Module

25
Q

PM

A

Preventative Maintenance

26
Q

PTS

A

Precision Temperature Sensor

27
Q

RMS

A

Root Mean Square

28
Q

RTS

A

Remote Temperature Sensor

29
Q

TMPR

A

Tamper

30
Q

UPS

A

Uninterruptable Power Supply

31
Q

XPDR

A

Transponder

32
Q

PPE

A

Personal Protective Equipment

33
Q

OSHA code requiring workers handling acids or batteries to wear face shields, aprons, and rubber gloves.

A

1926.411

34
Q

Minimum wire size for power supply grounds

A

6 AWG

35
Q

Battery maintenance checks should be performed when the ambient temperature is between

A

32°F (0°C) and 100°F (38°C)

36
Q

Verify that the batteries in the single string are of the same

A

Make and Model

37
Q

Verify battery date codes do not exceed

A

6 years

38
Q

When physically inspecting the batteries, the technician should look for

A

Leaking, cracking, swelling, discoloration, or excessive terminal corrosion

39
Q

Recommended and minimum space between batteries, ensuring proper air circulation

A

1/2” (13mm) of space is recommended; however, a minimum of 1/4” (7mm) space is required

40
Q

Conductance values are expressed with _______ values

A

Siemens (mhos)

41
Q

As a general rule of thumb, for every _______ drop in temperature below 77°F (25°C), the Siemens reading should be adjusted by 0.7%.

A

2ºF (1.11ºC)

42
Q

A unit of conductance equal to the reciprocal of the ohm

A

mho (ohm spelled backward)

43
Q

A unit of conductance in the meter-kilogram-second (mks) system equivalent to one ampere per volt.

A

Siemens

44
Q

Replacing a battery when conductance readings are _______ of the initial or published value for a new battery is recommended.

A

40% (drop of 60%)

45
Q

During a 10 min self test when do you record the readings of the individual battery voltages

A

9th minute

46
Q

If during a self test, the voltage of a single battery falls below this, replace the battery

A

10.8 VDC

47
Q

PSNB

A

Power Supply Notebook

48
Q

An electronic component that exhibits capacitance, the ability to store electrical energy in an electrostatic field.

A

Capacitor

49
Q

This electronic instrument is capable of measuring voltage, and sometimes also current and resistance

A

Digital Voltmeter

50
Q

A housing, cabinet, pedestal, or other protective covering for electronic or electrical components or equipment.

A

Enclosure

51
Q

A device or circuit that converts direct current electricity to alternating current electricity

A

Inverter

52
Q

A semiconductor that emits photons (light) when an electrical current flows across its p-n junction.

A

Light Emitting Diode (LED)

53
Q

An interface between a power source such as a UPS and critical loads.

A

Power Distribution Unit

54
Q

Any steady state (several seconds or longer) voltage above the normal or rated operating voltage of a device or circuit.

A

Overvoltage

55
Q

A device that produces electricity for use by electrical or electronic equipment or converts the electricity from the utility mains to a form suitable for use by electronic equipment.

A

Power Supply

56
Q

The available capacity of a battery expressed as a percentage of its rated capacity.

A

State of Charge

57
Q

A mechanical or electronic switch connecting one or more power-sensitive loads to one of several possible power sources, ensuring a smooth transition between the sources.

A

Transfer Switch

58
Q

A backup power source that maintains uninterrupted operation of one or more critical loads in the event of commercial power failure

A

Uninterruptible Power Supply (UPS)

59
Q
A

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