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Electrical Level 2 > Final Review > Flashcards

Final Review Flashcards

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1
Q

What is the formula for induced EMF

A

E=BLV

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2
Q

How many degrees out of phase is induced EMF

A

180

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3
Q

at what degrees in an AC sign wave does the voltage equal zero

A

0, 180, 360

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4
Q

What is formula for a period

A

p=1/f

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5
Q

What’s the formula for frequency

A

f=1/p

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6
Q

how do you find the effective or RMS value

A

.707 x Vp

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7
Q

how do you find how do you find the average value

A

.637 x Vp

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8
Q

what kind of voltage do HVAC systems use

A

low voltage

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9
Q

what Components can you find in an HVAC system

A

fans dampers pumps valves and controls

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10
Q

what is direct digital control

A

control routines of standalone controllers done in digital form

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11
Q

How many control loops does a DDC have

A

30-40

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12
Q

what wattage classifies a wind system as a large wind system

A

exceeds 100kw

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13
Q

What is inductance

A

Opposition to change in current

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14
Q

what is capacitance

A

Opposition to change in voltage

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15
Q

As inductive reactance goes up current goes..

A

down

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16
Q

As inductive reactance goes up frequency goes..

A

up

17
Q

what kind of losses are core losses

A

eddy current and hysteresis

18
Q

What kind of Test is used for core losses

A

Open Circuit test

19
Q

what are copper losses

A

I R losses

20
Q

What kind of test is used for copper losses

A

Short circuit test

21
Q

how many valance electrons is in a semiconductor

A

4

22
Q

what Is the voltage drop across silicone

A

0.7v

23
Q

what is the voltage drop across germanium

A

0.3v

24
Q

what is the secondary rating of a CT transformer

A

5a (series)

25
Q

what is the secondary rating of a PT transformer

A

120v (parallel)

26
Q

How many diodes are there in half wave rectification

A

One in series with an AC load

27
Q

how many diodes are there in full wave rectification

A

2-4 bridge type, biphase

28
Q

what distance above the floor does unit equipment have to be

A

2 meters

29
Q

what are the distance requirements for plugs

A

2.5 meters above floor and within 1.5 meters of equipment

30
Q

do Exit signs have a height requirement

A

no

Electrical Level 2 (2 decks)

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