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5 th year final > final > Flashcards

final Flashcards

1
Q

Most power distribution system supply what type of current, and how much of the world is currently using this type of system.

A

AC

over 90%

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2
Q

voltage drop calculations

A

2KIL/A

1.73KIL/A

k=12.9 for copper

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3
Q

effective, peak, average, and RMS voltages

A 
RMS = nominal (120 240 480 etc)
peak = RMS X 1.414
average = .636 X PEAK
RMS = Effective
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4
Q

When studying inductors and capacitor we know current flow is opposed by its _____ value that is expressed in ohms

A

Reactance

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5
Q

What is Lens law and how does it interact with EMF and CEMF on inductors?

A

EMF = electromotive force


CEMF = counter electromotive force


magnetic field opposes changes in voltage
EMF and CMF are 90 degrees out of phase

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6
Q

Know how to change inductance and capacitance into reactive values.

A

Inductive reactance= XL = 2 x 𝛱 x f x L (L in Henrys, f is frequency Hz, 6.28 for 2 x 𝛱)

Capacitive Reactance = XC = 1 / (2 x 𝛱 x f x C)
(C in Farads, f is frequency Hz, 6.28 for 2 x 𝛱)


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7
Q

Calculate 3 inductors in series/parallel, and 3 capacitors in series/parallel

A

inductors: work exactly like resistors
capacitors: work opposite of resistors

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8
Q

What is an atom and what are the different parts of it?

A

Atom = smallest piece and element can be broken 
 into without changing its properites.

Electrons
neutrons
protons

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9
Q

DC batteries when placed in series, what is additive, in parallel, what is additive?

A

In series voltages add. In parallel voltage is constant so the capacity (amperage or amp/hours add

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10
Q

What’s the difference between a primary battery cell and a secondary cell?

A

Secondary can be recharged primary cannot

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11
Q

What is the difference between the electron flow theory and the conventional flow theory?

A

electron flow theory flows negative to positive

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12
Q

Define Volt, Ampere, Watt, and Ohm

A

Volt = electromotive force the push


Ampere = 1 coulomb (6.28X1018) electrons per second

Ohm = the resistance or opposition to flow also use for reactance

Watt = power the work that can be done.

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13
Q

Earth is a poor conductor, which makes it have a high_______. We need to consider this when we are doing our grounding and bonding.

A

resistance

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14
Q

When designers of equipment systems dedicated specific cable type connector type and topology to be used for wiring systems

A

Structured, application dependent

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15
Q

which of the following standards is the basis for the administration of telecommunication infrastructure in commercial buildings

A

TIA / EIA 606A

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16
Q

it is recommend that utp and stp backbone cables are limited to no more than

A

295 ft

17
Q

which of the following is not one of the varieties of inside cable recognized by the NEC?

A

Commercial Cable

18
Q

Which of the following may not be used within the stud walls of an office building?

A

CMX

19
Q

For a given cable as frequency decreases the NEXT in Db

A

increase

20
Q

For a given cable as frequency decreases attenuation

A

decrease

21
Q

ANSI TIAA 569 standard says no conduit shall be longer than

A

30 meters

22
Q

Minimum of ____ inches of headroom above a cable tray?

A

12 inches

23
Q

Administrative label color for horizontal cables

A

BLUE

24
Q

Class IV administration addresses infrastructure with multiple sizes.

A

true

25
Q

Class I administration addresses the administration needs of a premises served by a single equipment room

A

true

26
Q

A busbar placed in a convenient and accessible locations and bonded to the grounded conductor at the service

A

TMGB

27
Q

How many 4 pair cat 5e cables can be terminated on one row of a 110 type block

A

6

28
Q

How can we increase the field strength of a conductor?

A

increase the current flow

29
Q

What are some factors that are considered by the courts when sexual harassment cases are tried?

A

totality of the circumstances to determine whether an environment is “hostile” or “abusive” and should consider the following nonexclusive list of factors: (1) the frequency of the discriminatory conduct; (2) its severity; (3) whether it is physically threatening or humiliating

5 th year final (1 decks)

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