Deck 8: Load Calculations

Question 1

Multiplying voltage by amperage produces ____.

A) kilo-volts (kV)
B) kilo-watts (kW)
C) kilo-amperes (kA)
D) volt-amperes (VA)

Answer 1

D

Question 2

The lighting load for residential dwelling units is ____ volt-amperes (VA) per square foot.

A) 3
B) 6
C) 9
D) 12

Answer 2

A

Question 3

The ____, including the strip heat and blower motor, is necessary information for calculating loads.

A) heat sink percentage
B) total wattage in kilo-watts
C) total volt-ampere load
D) British Thermal Units (BTUs)

Answer 3

C

Question 4

A scale ruler is used in ____.

A) determining the number of outlets
B) determining outlet ampacity
C) determining the location of outlets
D) converting units

Question 5

A clothes dryer neutral load on a feeder can be calculated at ____%.

A) 20
B) 50
C) 70
D) 75

Question 6

Horsepower ratings must be converted to ____ before they can be added to the load calculation form.

A) kilo-volts (kV)
B) kilo-watts (kW)
C) volt-amperes (VA)
D) kilo-amperes (kA)

Question 7

A dwelling unit must have at least ____ small-appliance branch circuit(s).

A) one
B) two
C) three
D) four

Question 8

The smaller of two (or more) ____ loads can be omitted, as long as they are never energized simultaneously.

A) noncoincident
B) nonsingular
C) incidental
D) compressor

Question 9

The term ____ designates utilization equipment commonly built in standardized types and sizes and installed as a unit to perform specific function(s).

A) receptacle
B) feeder
C) appliance
D) neutral conductor

Question 10

For the purpose of the standard method load calculation for a one-family dwelling, the terms neutral and ____ are synonymous.

A) load balanced
B) grounded
C) nonpositive
D) charged

Question 11

The ____ is not an important piece of information to gather before performing load calculations.

A) dwelling's total square-foot (ft²) area
B) number of laundry circuits that will be installed
C) fastened-in-place appliances that will be installed
D) location of circuit breakers

Question 12

Individual household cooking appliances rated more than ____ watts (volt-amperes) can be derated by using Table 220.55 demand factors (and all of the applicable notes).

A) 1000
B) 1250
C) 1500
D) 1750

Question 13

Load calculations must be performed in order to determine the ____.

A) size of circuit breakers
B) size of services and feeders
C) voltage drop across all circuits
D) placement of fuse boxes

Question 14

____ are not included in the calculated floor area of dwelling units.

A) Kitchen spaces
B) Laundry/utility rooms
C) Open porches
D) Roofed overhangs

Question 15

A feeder is defined as all circuit conductors between the ____ containing fuses or breakers that feed branch circuits.

A) main power source and the junction box
B) service disconnecting means and the panelboard
C) main power source and the fuse box
D) auxiliary service line and the panelboard

Question 16

No derating is allowed when there are only one, two, or three ____ appliances.

A) kitchen
B) laundry
C) fastened-in-place
D) small

Question 17

A demand factor of ____% can be applied to the nameplate rating load of four or more fastened-in-place appliances.

A) 35
B) 50
C) 65
D) 75

Question 18

Each laundry branch circuit is calculated at _____.

A) no more than 1500 volt-amperes
B) no less than 1500 volt-amperes
C) no more than 1000 volt-amperes
D) no less than 1000 volt-amperes

Question 19

____ must be included when calculating a dwelling unit service.

A) Detached garage space loads
B) Crawl space branch circuits
C) Refrigeration equipment loads
D) Small-appliance branch circuits

Question 20

The ____ for each floor of a one-family dwelling shall be computed using the outside dimensions.

A) lighting load
B) residential space
C) load capacity
D) floor area

Question 21

The exact nameplate rating of the clothes dryer, even if less than ____ volt-amperes should be used in load calculations.

A) 1000
B) 2500
C) 5000
D) 7000

Question 22

____ are not included in calculating receptacle loads for appliances.

A) Air-conditioning systems
B) Counter-mounted cooking units
C) Clothes dryers
D) Wall-mounted ovens

Question 23

The minimum size grounding electrode conductor is ____ AWG copper (or 4 AWG aluminum).

A) 2
B) 4
C) 6
D) 8

Question 24

For a service rated 100 through 400 A, the service conductors supplying the entire load associated with a one-family dwelling shall be permitted to have an ampacity not less than _____% of the service rating.

A) 68
B) 83
C) 100
D) 112

Question 25

In outdoor applications, ____ grounding electrode conductors must not be installed within 18 in.(450 mm) of the earth.

A) stainless steel
B) copper
C) aluminum
D) composite