TCM 322 Final

which of the following phrases does the code book use to designate permissive requirements?

"shall be permitted"

find the total cost for operating the following utilizations equipment for a month (30days), giving the residential electrical rate of $0.085 per kWh. Space heater- 5000Watts; 45 min per day Washing machine- 1340 watts; 10 hrs per month Window AC unit- 2000 watts; 8 hrs per day

$50 to $54.99

Find the total cost for operating the following utilization equipment for a mont (30 days), given the residential electrical rate is $0.12 per kWH oven- 5000Watts; 30 mins per day washing machine- 1340 watts; 12 hrs per month window ac unit- 1200 watts; 12 hrs per day tv- 600 watts; 6hr per day

$75.73

Find the total resistance of the DC circuit 24v 0.5ohms (5ohms, 5ohms) (1ohm, 3ohms, 6ohms)

(25/10)+0.5+((18/9)/(27/9)) = 3.6667 ohms

what is the cross sectional area in square inches for a #10 THWN conductor?

0.0211

what is the cross-sectional area in sq in. for a #10 THW conductor?

0.0243

A#2 conductor is installed in a location where the ambient temperature is expected to be 55 deg. F. The temperature correction factor for conductor ampacity in this location is___________?

1.22

what size EMT conduit is requited for (6) #2 AWG THHN copper conductors?

1.5"

what is the wattage of this single phase AC appliance: 110V, 11A, PF .85

1028.5 Watts

how many #14 TFE conductors can be installed in trade size 1/2" Flexible Metal Conduit (FMC)?

12

What is the missing voltage in the sketch? 120v with 100 amps and 1000 amps with ____ V

12V

you need to make a 90 deg. stub with a height of 20 inches. how far from the end of the conduit should you make a mark assuming that you are using the hand bender below and that you will use the arrow mark on the bender as a refernece point?

14"

what is the allowable ampacity of an uncoated copper #14 UF wire rated for 600 V in a conduit with less than 3 current carrying conductors (assume normal ambient temperatures)

15-24.9 amps

what is the working (or true) power being consumed by a 240-volt, single phase AC motor (PF= of .91) that draws 7.5 amps?

1638 watts

Given the following transformer equation [Es=(Ns/Np) x Ep and Es x Is=Ep x Ip ], what is the voltage on the secondary side of a transformer that has 400-v, 80-amps on the primary, 160-ams on the secondary, and 100 loops on the secondary side?

200 volts

what is the missing voltage from the sketch? 120V with 50 turns and 1000 turns and how many volts?

2400v

what is the allowable ampacity of an uncoated copper #12 XHHW-2 wire rated for 600V in a conduit with less than 3 current carrying conductors (assume ambient temperature = 30 deg. cel.

25-34.9 amps

if the above is a 120V/208V three-phase panel, how many amps does the S.E. Batting Cage draw if the power factor is 1.0?

3.33

Per your design guidelines you must install your branch circuit wiring to have voltage drop less than 3%. The project you are working on has a branch circuit load of 50-amps at 120-VAC. If you plan to use #2 THHN (copper, uncoated) wire, what is the maximum one-way distance that you can locate the load from to over current protection device?

3.6=(2 x L x 50amps x 0.194)/1000 3600= 2 x L x 0.194 185.567ft =L

What is the working (or true) power being consumed by a 480V, three phase AC motor (PF= of .76) that draws 5 amps?

3159 watts

In a DC circuit, what is the power for a load that draws 4 amps over a resistance of 2 ohms?

32 watts

Select the wire size that is the largest diameter #18 1/0 4/0 500 kcmil 250 kcmil

500kcmil

what is the maximum number #10 conductors that you can place in a 4"x4"x1-1/4" square box?

7

also known by trade name "BX"

AC

which electrical component is typical represented by the following symbol? O= (lines go through circle)

Duplex Receptacle

which of the following is the correct formula for ohm's law

E= I x R

The purpose of lighting is to provide for:

Flexibility, reduce energy usage

Which of the following is an important performance criterion for ballasts?

Heat, noise, dimming control (all of the above)

Which of the following ballasts types are considered to be antiquated or out-of-date technology?

Magnetic

Which of the following is a type of high intensity discharge (HID) lamp?

Mercury lamps, Metal halide lamps

Picture match of following

Metal wireway condulet FMC Cable Tray Busduct Poke-Thru LFMC

known generally by the trade name of "romex"

NM

most common cable type found in residential construction

NM

according to the NEC Code, which of the following is not approved for wet locations?

NM Cable

which of the following is the correct formula for the Power Formula for DC circuits?

P=ExI

Incandescent lamps have been used for over 125 years, which of the following is NOT an advantage of using lamps based upon Edison's original idea from 1879?

Resistance to voltage variation

used for service entrance applications

SE

Picture match of following

Single-pole, single through switch Three-way Switch Four way switch ground fault circuit interrupter receptacle standard duplex receptacle. 120V, 20 amps standard duplex receptacle. 120V, 15 amps

why is the majority of power produced and consumed in the United Stated alternating current?

Smaller transmission conductors, lower generation costs, easier voltage transformations (all of the above)

the number of conductors permitted in RMC conduit shall not exceed the percentage fill specified in ________?

Table 250.66

cable similar to non-metallic cable, but suitable for direct burial

UF

what size liquid tight flexible metal conduit (LFMC) is required for one (1) 3/0 THW conductor and one (!) 1/1 RHW conductor

Written part 3/0THW---0.3117 1/0RHW---0.3039 add together, 0.6156 Answer is 2" LFMC

If the POWER in a DC electrical circuit is 25 watts and the resistance in the same circuit is 9 ohms, what is the voltage in the circuit?

Written part.... 15 volts P(w)=E^2/R

In respect to panelboard terminology, a space is:

an unfilled panelboard slot that is used to accommodate future circuit breakers

the ability to store energy in an electric field

capacitance

In building construction and power distribution, a transformer is generally used for:

changing voltage in the conductor

Rate of flow of electric charge

current

ratio of lumens produced by a lamp to the watts consumed

efficacy

Fluorescent lamps emit visible light from the arc of the electricity between the electrodes in each tube end

false

On a transformer, coil taps allow electricians to determine the allowable hot spot temperature rise

false

continuous duty motors are subject to more severe electrical conditions that intermittent duty motors

false

static control schemes for lighting incorporate feedback through occupancy sensors and illumination level sensors to adjust the lighting levels

false

the ceiling cavity height of a room does not impact the schematic lighting design?

false

when determining the cost for electricity consumption within a residential building, it is necessary to calculate both the energy cost and the demand charge?

false

considered a low intensity discharge lamp; utilizes a phosphorus coated tube

fluorescent

which of the following transformer cooling methods is most efficient at dissipating heat?

forced air cooled

Type of "light-bulb" that requires no ballast; it provides excellent color rendering

halogen

luminous power per unit area ( 1 lumen per sq. ft.)

illuminance

a measure of resistance to AC circuits comprised of both resistance and reactance

impedance

most circuits in the home are wired:

in parallel

transformers are rated in _____?

kVA

what is the correct term for a "light bulb" (e.g, a 60-watt GE incandescent as pictured below)

lamp

Which of the following is NOT an enclosure type you can find specified for a motor?

liquid-immersed/self-air cooled

type of "light-bulb" that provides the highest efficiency of virtually any light source

low pressure sodium

what is the total estimated electrical load (lighting and outlets only) for a 6000ft^2 church that has 20 convenience receptacles? 21,00V-A 12,000V-A 9600V-A 8400V-A none of the above

none of the above

rate of work or rate of using energy

power

the relationship between the apparent power and true power for utilization equipment

power factor

opposition to the flow of current

resistance

know the switches on a multimeter, which one did we use before turning the panel on to check the circuit to make sure there were no shorts in the circuits in the panel board

the wifi looking one

Halogen lamps use a tungsten filament that evaporates when heated by current. Light is generated when the tungsten evaporates.

true

Modern electronic ballasts can be dimmed over the full range of light outputs

true

the basic impulse (BIL) is an indication of a transformer insulations ability to withstand voltage surges

true

measure of electromotive potential

voltage

Find full load current

written part

Find luminaires and UPD

written part

Find minimum box volume

written part

Find total current for DC circuit

written part

Know how to wire a 4 way switch

written part

minimum size of box given conduit size

written part

Allowable ampacity for a single #2 THHN copper conductor that is installed with 5 other conductors in a conduit that is 4" above a roof (measure from roof to bottom of conduit)? assume that the ambient temperature before correction factors is 76 deg.

written part 1) 130 2)----- 3)1.04 4) .80 130 x 1.04 x .80 =108.16 amps

A branch circuit feeds to a 120V-#A motor load at the end of a warehouse 600' away, if #10AWG (1.21ohms/kFT) is used, does the circuit fall under 5% voltage drop? VD=(2xLxIxR)/1000

yes VD=3.6%