Master Electrician

Question 1

What is an ampere?

Answer 1

The unit of current measurement. The amount of current that will flow through a one ohm resistor when one volt is applied

Question 2

How do you find Power?

Answer 2

Power(P) = Current(I)x Volts(E)

Question 3

How do you find Current?

Answer 3

Current(I)=Power(P) / Volts(E)

Question 4

How do you find Volts?

Answer 4

Volts(E)= Power(P)/ Current(I)

Question 5

I stands for?

Answer 5

I = Amperes or Current draw on the load

Question 6

E stands for?

Answer 6

E = Volts

Question 7

kVA stands for?

Answer 7

kVA = Kilovolt-Amperes

Question 8

PF stands for?

Answer 8

PF = Power Factor

Question 9

HP stands for?

Answer 9

HP = horse power

Question 10

VA stands for?

Answer 10

VA = Power

Question 11

W stands for?

Answer 11

W = Watts

Question 12

Pf stands for?

Answer 12

Pf = Power Factor

Question 13

How do you find VA (power)?

Answer 13

VA = W watts/Pf power factor

Question 14

Ohms Law Circle Formula uses what 3 letters?

Answer 14

E. I. R. E(Voltage). I(Current). R(Resistance)

Question 15

Power Circle Formula uses what 3 letters?

Answer 15

P. I. E. P(power) I(Current). E(Volts)

Question 16

Power Factor Triangle uses what 3 letters?

Answer 16

W. VA Pf. W(watts). VA(Power). Pf(Power Factor)

Question 17

How do you find Resistance?

Answer 17

Resistance(R) = (E)Voltage/(I)Current

Question 18

How do you find Current?

Answer 18

Current(I) = (E)Voltage/(R) Resistance

Question 19

How do you find Voltage?

Answer 19

Voltage(E) = (I)Current x (R) Resistance

Question 20

What is the multiplying factor(number) consistently used in three phase formulas?

Answer 20

1.732

Question 21

How do you find Watts?

Answer 21

Watts(W) = VA (Power) x Pf (Power Factor)

Question 22

How do you find Pf?

Answer 22

Power factor(Pf) = (W)Watts / (VA) Power

Question 23

VD stands for?

Answer 23

VD = Volts dropped from a circuit

Question 24

What is the multiplying factor for a single phase circuit?

Answer 24

2, The 2 represents the conductor length in single-phase circuits

Question 25

What does D stand for?

Answer 25

D = The distance from the source voltage to the load

Question 26

What does K stand for?

Answer 26

K = is the resistivity of the conductor per mil foot. A mil foot is a wire 1 foot long and one mil in diameter. The K value of Copper - 12.9 ohms per mil foot The K value of Aluminum - 21.2 ohms per mil foot

Question 27

What is the K value of Copper per mil foot?

Answer 27

12.9 ohms

Question 28

What is the K value of Aluminum per mil foot?

Answer 28

21.2 ohms

Question 29

What is the formula to find voltage drop in a single phase circuit?

Answer 29

VD = 2 x K x I x D / CM

Question 30

What does CM stand for?

Answer 30

Circular mil area of a conductor (refer to chapter 9/table 8)

Question 31

How do you find wire size in a single - phase circuit? (formula)

Answer 31

D = CM x VD / 2 x K x I

Question 32

How do you find the MAXIMUM current in amperes in a single - phase circuit? (formula)

Answer 32

I = CM x VD / 2X K X D

Question 33

One kW equals how many watts?

Answer 33

1000

Question 34

One kVA equals how many volt-amps

Answer 34

1000

Question 35

One horse power equals how many watts?

Answer 35

746

Question 36

What is the formulas used to determine the available power for a single phase circuit, load, or an electrical system?

Answer 36

``` P = I x E P = current x volts P = volts x amps ```

Question 37

Current can be expressed as ...

Answer 37

``` as the letter I and as... amps amperes full-load current amperage amperage draw line load FLC FLA full load amps ```

Question 38

Power factor is the ratio between true power expressed and ___________?

Answer 38

``` watts, kilo watts kW volt-amps VA kVA ```

Question 39

True power (watts) EQUAL to apparent power (VA) in .....

Answer 39

an electric circuit or load containing ONLY resistance

Question 40

True power (watts) is LESS than apparent power (VA) in a circuit or load containing ...

Answer 40

inductance or capacitance, such as motor, transformers, HID and florescent lighting

Question 41

What is the definition of a CONTINUOUS load?

Answer 41

Where the maximum current is expected to continue for 3 hours or more

Question 42

Examples of a continuous load are .....

Answer 42

Lighting loads (commercial and industrial occupancies) expected to operate for 3 hours or more.

Question 43

Branch circuit conductors shall have an allowable ampacity of NOT less that ...

Answer 43

125% of the continuous load, plus the 100% of the non-continuous load

Question 44

How is the rating of a branch circuit determined?

Answer 44

By the maximum ampere rating of the overcurrent protective device (circuit breaker or fuse) and NOT by the size of the conductors used for the branch-circuit

Question 45

True or False: Circuit breakers are NOT listed for continuous operation, unless they have a rating of at least 400 amperes or more.

Answer 45

True

Question 46

True or False: In general, lighting loads are to be supplied by 15- and 20- ampere rated branch circuits

Answer 46

True

Question 47

True or False: Overcurrent devices protecting branch circuits are not to be loaded more than 70% of their rated value when protecting continuous loads.

Answer 47

False - 80%

Question 48

When calculating lighting loads for dwelling units DO NOT include...

Answer 48

open porches, garages, or unfinished spaces not adaptable for future use.

Question 49

True or False: Lighting loads for habitable spaces of dwelling units and guest rooms and hotels and motels are considered as continuous use.

Answer 49

FALSE - guest rooms and hotels and motels are NOT considered as continuous use BUT lighting loads of commercial and industrial occupancies ARE considered as continuous.

Question 50

True or False: Multifamily condo without a cooking facility is calculated at the same 2 VA per square foot as hotels and motels when determining the minimum general lighting branch-circuits.

Answer 50

True